Generalized Lithology and Lithogeochemical Character of Near-Surface Bedrock in the New England Region

1

Generalized Lithology and Lithogeochemical

Character of Near-Surface Bedrock in the New

England Region

G.R. Robinson, Jr. and K.E. Kapo, 2003

USGS Digital Open-File Report 03-225

Description:

Abstract:

This geographic information system (GIS) data layer shows the

dominant lithology and geochemical, termed lithogeochemical, character

of near-surface bedrock in the New England region covering the states

of Connecticut, Maine, Massachusetts, New Hampshire, Rhode Island,and

Vermont. The bedrock units in the map are generalized into groups (rock

groups) based on lithological composition, geochemistry, and geologic

province divisions by time-stratigraphic groups that share common

features of (1) age of formation, (2) geologic setting, (3) tectonic

history, and (4) lithology.

Purpose:

This data layer portrays the general lithologic and

geochemical(lithogeochemical) character of the near-surface bedrock in

New England. The geologic characterization provided in this

classification is intended to portray significant bedrock geologic

features that influence stream sediment and soil chemistry and water

quality in relation to near-surface bedrock units. The term near-

surface bedrock in this report refers to bedrock (lithified rock)

deposits generally with 60 feet or less of overlying glacial or other

unconsolidated surficial deposits and to bedrock depths of 500 feet or

less, which represents the typical depth range of most drilled bedrock

water wells in the region. The thickness of Quaternary sediments

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overlying bedrock is generally less than 60 feet in the New England

states (Soller, 1993).

The digital geologic data provided in this report has grouped and

generalized some of the bedrock units shown on the individual state-

level bedrock geologic maps, and does not portray all of the detail

shown on the state maps. In addition, a few areas have been modified

from those shown on the state maps, for example, additional units

portrayed by Smoot (1991) are shown in the Hartford Basin area of

Connecticut and Massachusetts and mismatched contacts have been

adjusted along state borders. Based on the geologic map compilation

scales, mismatches of some unit contacts across state boundaries, and

the positioneal uncertainty of the source digital files relative to the

published geologic maps, the spatial accuracy of this compilation is

estimated as 1.5 km.

To the degree that surficial materials are related to their

proximal bedrock source, the variations in bedrock geology also provide

guidelines to the expected variation in the properties and chemistry of

surficial materials and surface waters. In glaciated areas, such as New

England, the mineralogy of tills and some stratified drift is related

to adjacent bedrock units, and bedrock geology has been used to help

define their chemical character (Bailey and Hornbeck, 1992). A

lithogeochemical framework similar to that provided in this report has

been used to define correlations between groundwater chemistry and

bedrock geology (Grady and Mullaney, 1988; Ayotte and others, 1999).

Groundwater chemistry for alkalinity, pH, Ca, Mg, Na, silica, and radon

in surficial aquifers sampled from wells up to 60 feet in depth in

surficial aquifers have been shown to correlate with groups of

lithology of the underlying bedrock (Grady and Mullaney, 1988).

Groundwater chemistry for pH, iron, manganese, and arsenic in fractured

crystalline bedrock aquifers sampled from wells up to 500 feet in depth

differ by bedrock lithology groups (Ayotte and others, 1999; Ayotte and

others, 2003).

This geologic characterization provides a framework to

interpret regional geochemistry and habitat characteristics in relation

to bedrock lithology and geologic provinces that share common features.

The lithogeochemical data layer combines and extends data previously

compiled for the U.S. Geological Survey National Water Quality

Assessment Program (NAWQA) study areas of the New England Coastal Basin

(NECB), and the Connecticut, Housatonic, and Thames River Basins

(CONN). The coverage provides digital geologic information that may be

applied to the analysis of water-quality characteristics of surface

water and shallow ground water, and soil and stream sediment

characteristics based on bedrock lithogeochemistry.

(Previous Data Releases: Robinson and others, 1999; Robinson

and others, 2002.)

Supplemental_Information:

This data set incorporates data from digital maps of two NAWQA

study areas, the New England Coastal Basin (NECB) and the Connecticut,

Housatonic, and Thames River Basins (CONN) areas and extends data to

cover the states of Connecticut, Maine, Massachusetts, New Hampshire,

Rhode Island, and Vermont. The result is a regional dataset for the

lithogeochemical characterization of New England (NE_LITH). The

following information combines and extends the metadata provided for

each original digital dataset and includes information on edits and

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additions made to the earlier data sets in the final combined coverage.

Polygons in the final coverage are attributed according to state,

drainage area, geologic province, general rock type, lithogeochemical

characteristics, and specific bedrock map unit. The following

discussion addresses each attribute in turn for the New England data

set.

The coverage is divided by drainage basins based on the USGS

National Water Quality Assessment (NAWQA) study areas CONN and NECB.

NAWQA program information can be accessed at:

http://water.usgs.gov/nawqa/studyu.html

For purposes of focusing on the area of New England in this

coverage, two new drainage areas have been added to the coverage:

Northern Maine (N_MAINE) and St. Lawrence/Hudson River (STL_HUD)

drainage areas. The N_MAINE drainage area covers the area in Maine not

included in the NECB study area. The STL_HUD drainage area combines the

small portion of the NAWQA Hudson River basin included in this

coverage, and the area of northern Vermont not included in a NAWQA

study area. These drainage areas are identified under the item

“Hydro_Bsn” are as follows:

CONN (Connecticut, Houstanic, and Thames River Basin)

NECB (New England Coastal Basin)

N_MAINE (Northern Maine)

STL_HUD (St. Lawrence, Hudson River Basin)

Figure 1: Hydrologic Basins (Hydro_Bsn)

The bedrock units shown on the individual State maps for the New

England study area have been grouped into 10 geologic provinces. The

map units in each province group share common features of (1)

lithology, (2) age of formation, (3) geologic setting, and (4) tectonic

history. The province groups generally occur as northeast trending

belts that follow the structural fabric of the Appalachian foldbelt and

faults in New England. The geologic provinces are identified in the

dataset by item “G_Province” (name) and “G_Prov_id” (symbol). The

geologic province groups, listed in general order from west to east,

are, by symbol and name, respectively:

(Y) Grenville Belt

(S) Grenville Shelf Sequence

(H) Eugeosynclinal Sequence

(C) Waits River-Gile Mountain Belt

(N) Mesozoic Basin

(B) Bronson Hill Belt

(M) New Hampshire-Maine Sequence

(CM) Coastal Maine

(Z) Avalon Province

(NB) Narragansett Basin

A detailed description of Geologic Province categories is provided in

the “Tabled Descriptions” section of this document.

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Figure 2: Geologic Provinces of New England (G_Province, G_Prov_id)

The lithogeochemical classification scheme for the New England

Lithology data set was first developed as part of the USGS's study of

the CONN area (Robinson and others, 1999). The classification scheme is

based on geochemical principles, previous studies of the relations

among water-quality and ecosystem characteristics and rock type, and

regional geology (Robinson,1997 and references cited within). The

classification scheme and data set are intended to provide a general,

flexible framework to portray the lithologic character of mapped

bedrock units in New England in relation to regional geochemical and

water-quality data. The data set is a lithologic map that has been

coded to reflect the potential influence of bedrock geology on water

quality and sediment chemistry. Information on the map unit identities

portrayed on the source bedrock geologic maps for each state are

retained in this digital dataset.

The bedrock units in New England have been mapped by time-

stratigraphic and other geologic criteria that may not be directly

relevant to variation in regional geochemistry and water quality.

Bedrock units depicted on the State geologic maps are inconsistent

across state boundaries in some areas (See Data_Quality_Information

section of this document for explanation on how these discrepancies

were addressed with the classification scheme). Thus, a regional

coding scheme was developed to reclassify the geologic map units

according to mineralogical and chemical characteristics that are

relevant for analysis of regional variation in geochemistry and water-

quality.

To provide a framework for geochemical investigations, the

bedrock units were classified according to the chemical composition

(based upon the geologic maps used in the creation of this data set,

see references) and the relative susceptibility to weathering of their

constituent minerals. Although weathering rates may vary, the relative

stability of different minerals during weathering in moist climates is

generally consistent (Robinson, 1997). However, the degree to which a

rock weathers reflects the proportions of its constituent mineral as

well as many other factors such as degree of induration and relative

amount of mineral surfaces exposed to water through primary and

secondary porosity (Robinson, 1997 and references cited within). Thus,

although largely based on the relative stability of rock constituent

minerals, the classification scheme to group bedrock units according to

effects on soil and sediment chemistry and water quality is more

complex than mineral-stability sequences. Most common rock-forming

minerals are only sparingly soluble, so that small amounts of highly

reactive minerals can have large effects on water quality (Robinson,

1997; Grady and Mullaney, 1998). For example, rocks containing

significant amounts of carbonate minerals are more rapidly weathered

and tend to produce higher solute concentrations in natural waters than

many other rock types. In contrast, rock types such as granite, schist

and quartzite, are rich in quartz, muscovite, and (or) alkali-

feldspars; these minerals tend to produce low solute concentrations

because they react to a lesser degree and at slower rates than other

mineral types in humid temperate climates (Robinson, 1997). Further

description of the lithogeochemical classification scheme and the

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expected water-quality and ecosystem characteristics associated with

each lithogeochemical unit is explained in Robinson (1997).

The lithogeochemical classification scheme used in this data set

incorporates mineralogical information derived from published

descriptions of the bedrock geology map units with other information on

geologic features, such as metamorphic grade and geologic setting. The

coverage attributes of lithology code (“Litho_code”) and modifier code

(“Lith_mod”) are used to express this lithogeochemical coding of

bedrock units. Thirty-seven lithogeochemical units (combinations of

lithology and modifier codes) are defined for the New England study

region based on the mineral and textural properties of the bedrock

unit's constituent minerals, presence of carbonate and sulfide

minerals, depositional setting (such as restricted deposition within

fault bounded sedimentary basins of Mississipian or younger age), and

for some of the granitic units, mineralogy and magma chemistry. The

classification scheme used descriptions from State and regional

geologic maps (Doll and others, 1961; Osberg and others, 1985; Lyons

and others, 1997; Zen and others, 1983; Hermes and others, 1994; and

Rogers, 1985; Smoot, 1991). For Rhode Island and Maine, source

materials of the State geologic maps were available as digital data

layers (Osberg and others, 1985, Maine; Hermes and others, 1994,

1:100,000 scale, Rhode Island).

Information used from these sources included descriptions of the

lithology, mineralogy, and weathering characteristics of the bedrock

units. For example, "rusty-weathering" serves as an indicator of

sulfidic-bearing bedrock units (Robinson,1997). Carbonate and sulfide

minerals predominate in the classification scheme because these highly

reactive minerals have a disproportionately large effect on water

chemistry compared to other minerals commonly found in the rocks of

this region (Robinson,1997). In the Maine data set, information about

metamorphic grade was also used to classify bedrock units. A digital

data layer of generalized regional metamorphic zones (Guidotti,1985,

shown in Osberg and others, 1985, was obtained from the Maine

Geological Survey. This layer was intersected with the digital bedrock

geology to determine the regional metamorphic grade of each polygon in

the bedrock geology data layer. Polygons lying within two metamorphic

zones were split at the metamorphic-zone boundary. Metamorphic grade

and geochemical composition of the protolith (pre-metamorphism source

rock) were used to classify polygons into lithogeochemical units. For

example, bedrock units with protoliths of "limestone and (or)

dolostone" were classified as "limestone, dolomite, and carbonate-rich

clastic sediments" (lithogeochemical unit "11u") in areas of none or

weak regional metamorphism and as "marble, may include some calc-

silicate rock" (lithogeochemical unit "12u") in areas of greenschist

facies or high-grade metamorphism.

The thirty-seven lithogeochemical units are defined for the New

England study region using an alpha-numeric identification: a lithology

code (“Litho_code”, numeric) with a modifier code (“Lith_mod”,

alphabetic).

Example: Litho_code= “33” and Lith_mod= “cs”

Lithological unit is expressed as “33cs”

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There are 20 lithology codes (including a code for water) that

represent rock type, metamorphic grade, and geologic setting. Each

bedrock unit is assigned one of 20 lithology codes based on the

description of the bedrock unit from the State bedrock geologic maps.

Nine lithological modifier codes are used to identify minor amounts of

carbonate and(or) sulfide minerals, and subdivide granitic units into

subgroups based on their chemical and mineral characteristics. A

detailed listing and descriptions of the 37 lithogeochemical units

(lithology and modifier code combinations, such as “33cs”) are provided

in the “Tabeled Descriptions” section of this document under “Item

name: Lithogeochemical unit”. For definitions of each individual

lithology and modifier code, see the “Entity and Attribute Information”

section of this document under “Litho_code” and “Lith_mod”.

The 37 lithogeochemical units are generalized into major rock

group categories (Rock_GpA and Rock_GpB). Each category under these

headings shares similarities in overall geochemistry and lithology.

Rock Group A (“Rock_gpA”) has 8 categories (including one for

freshwater). A table of Rock Group A categories is listed below:

Basin Sedimentary;

Calcpelite;

Carbonate Rocks;

Granite;

Mafic Rocks;

Metamorphic Rocks Undivided;

Unconsolidated Sediments;

Water;

A detailed description of Rock Group A categories, including

lithogeochemical units under each cateogory, is provided in the ‘Tabled

Descriptions” section of this document. As previously discussed,

bedrock lithology information was obtained from separate state source

maps, and this results in some discrepancies in rock group categories

between polygons that meet along state borders. For example, a bedrock

polygon that is split into two polygons by a state border may be be

categorized as “Metamorphic Rocks Undivided” in one state and

“Carbonate Rocks” in the other state, based upon the different

characterization methods used by the originators of each of the state

geologic maps. However, these discrepancies are relatively few and do

not interfere with the overall lithologic patterns of the New England

study area.

Figure 3: Rock Group A (Rock_GpA)

The eight major groups for Rock Group A are further divided into

Rock Group B. Rock Group B (“Rock_GpB”) has 19 categories (including

one for freshwater). Each category has an ID code (“R_GpB_ID”) that is

used as a cross reference to other tabled information. A table of Rock

Group B categories (R_GpB_ID, column 1) and (Rock_GpB, column 2) are

listed below:

(1) Carbonate-bearing metasedimentary rocks;

(10) Calcpelite;

(11) Calcgranofels:

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(20) Mesozoic Basin Sediments;

(21) Narragansett Basin Sediments;

(3) Metamorphic rocks, other;

(30) Pelitic Rocks;

(31) Sulfidic Schists;

(4) Mafic Rocks;

(41) Basalt;

(5) Ultramafic Rocks;

(6) Granite, other;

(60) Felsic Volcanics;

(61) Grenville Granites;

(62) Avalon Granites;

(63) Peraluminous Granites;

(64) Alkali granites (White Mt);

(7) Unconsolidated Sediments;

(0) Water;

Unconsolidated sediments (R_GpB_ID = 7) include both non- and

poorly consolidated sediments, and encompasses areas in the south-

coastal part of the New England study area where the bedrock is

overlain by thick glacial sediments at the surface. These surficial

glacial deposits are the primary aquifer for these areas.

A detailed description of Rock Group A categories, including

lithogeochemical units under each cateogory, is provided in the “Tabled

Descriptions” section of this document. Again, due to differences

between original state source maps, some discrepancies may be found in

rock group categories between polygons that meet along state borders.

Figure 4: Rock Group B (Rock_GpB)

Individual bedrock unit codes are designated by state from the

original state geologic maps used to create the digital coverage (see

references for source maps). Names and descriptions for each bedrock

code were gathered from source maps and are provided in Appendix Table

A. The “Bedrock_1” attribute describes the alphanumeric code given to

bedrock units in original state map sources (for example, “Trnh” or

“Dw3A”). Some units have been combined (example Bedrock1= “O-cr+O-cra”)

during the digitizing process. “Bedrock_2” may further designate a

polygon as “water” if appropriate, but if the polygon is not a water

body “Bedrock_2” is simply a repeat of “Bedrock_1”. Further detail of

these attributes can be found in the “Tabled Descriptions” section of

this document, and Appendix Table A.

The bedrock units shown on the individual State maps for the New

England study region were classified according to a lithogeochemical

scheme modified from Robinson and others (1999). Specifically, the

modification included additional classification into broad rock groups

and the subdivision of granitic bedrock units into subgroups based on

age and magma chemistry, and the addition of modifying attributes to

indicate relative age. However, this modification to the

classification system is evident in the lithogeochemical units.

Overall, the bedrock units in this coverage for the New England region

are classified in a consistent manner that can be used to evaluate the

influences of bedrock geology on water-quality characteristics and

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sediment chemistry. Examples of how this data set has been used in

analyzing water-quality characteristics by lithogeochemical units and

rock groups is provided in Grady and Mullaney (1998) and Ayotte and

others (2003).

Quality Assurance procedures:

The scientific content of this digital data set underwent technical

review by two USGS scientists who have knowledge of the regional

geology, and GIS and spatial-data production. The data set was

evaluated on positional accuracy, contextual accuracy, attribute

accuracy, and topological consistency.

References_Cited:

Ayotte, J.P., Nielsen, M.G., Robinson, G.R., Jr., Moore, R,B., 1999,

Relation of arsenic, iron, and manganese in ground water to aquifer

type, bedrock lithogeochemistry, and land use in the New England

Coastal Basins, U. S. Geological Survey Water-Resources Investigative

Report 99-4162, 61 p.

Ayotte, J.D., Montgomery, D.L., Flanagan, S.M., and Robinson, K.W.,

2003, Arsenic in ground water in eastern New England: Occurrence,

controls, and human health implications: Environmental Science and

Technology, v. 37, no.10, p.2075-2083.

Bailey, S.W. and Hornbeck, J.W., 1992, Lithologic composition and rock

weathering potential of forested, glacial-till soils, Research paper

NE-662, Radnor PA: United States Department of Agriculture, Forest

Service, Northeastern Forest Experimental Station, 7 p.

Doll, C.G., Cady, W.M., and Thompson, J.B., Jr., and Billings, M.P.,

eds. and compilers, 1961, Centennial Geology Map of Vermont:

Montpelier, VT, U.S. Geological Survey, 1:250,000, 1 sheet. (transverse

mercator projection, based on best available information).

Grady, S.J. and Mullaney, J.R., 1998, Natural and human factors

affecting shallow water quality in surficial aquifers in the

Connecticut, Housatonic, and Thames River Basins: U.S. Geological

Survey Water-Resources Investigations Report 98-4042, 81 p.

Guidotti, C.V., 1985, Generalized map of regional metamorphic zones:in

Osberg, P.H., and others: Augusta, Maine, Maine Geological Survey, 1

map sheet, 1:1,600,000.

Hermes, O.D., Gromet, L.P., Murray, D.P., 1994, Bedrock geologic map of

Rhode Island: Kingston, R.I., Office of the Rhode Island State

Geologist, Rhode Island Map Series No 1, 1 map sheet, 1:100,000.

9

Lyons, J.B., Bothner, W.A., Moench, R.H., and Thompson, J.B., Jr.,

1997, Bedrock geologic map of New Hampshire: Reston, Va., U.S.

Geological Survey Special Map, 2 map sheets, 1:250,000.

McHone, J.G., and Butler, J.R. 1984. Mesozoic igneous provinces of New

England and the opening of the North Atlantic Ocean: Geological Society

of America Bulletin v.95, p. 757-765.

Osberg, P.H., Hussey, A.M. II, and Boone, G.M., 1985, Bedrock geologic

map of Maine: Augusta, Maine, Maine Geological Survey, 1 map sheet,

1:500,000.

Robinson, G.R., Jr., 1997, Portraying chemical properties of bedrock

for water quality and ecosystem analysis: an approach for the New

England Region: U.S. Geological Survey Open-File Report 97-154, 17 p.

Robinson, G.R., Jr., Peper, J.D., Steeves, P.A., and DeSimone, L.A.,

1999, Lithogeochemical character of near-surface bedrock in the

Connecticut, Housatonic, and Thames River Basins: U.S. Geological

Survey, Water-Resources Investigations Report 99-4000 digital.

Robinson, G.R., Jr., Ayotte, J.P., Montgomery, D.C., and DeSimone, L.A.

2002, Lithogeochemical Character of Near-Surface Bedrock in the New

England Coastal Basins: U.S. Geological Survey Open-File Report, 02-00

digital.

Rogers, John (compiler), 1985, Bedrock geological map of Connecticut:

Connecticut Geologic and Natural History Survey, Natural Resource Atlas

Map Series, 2 map sheets, 1:125,000.

Soller, D.R., 1993, Map showing the thickness and character of

Quaternary sediments in the glaciated United States east of the Rocky

Mountains – Northeastern States, the Great Lakes, and parts of southern

Ontario and the Atlantic offshore area (east of 80

o

31’ west longitude):

U.S. Geological Survey Miscellaneous Invistigations Series Map I-1970-

A.

Smoot, J.P., 1991, Sedimentary facies and depositional environments of

early Mesozoic Newark Supergroup basins, eastern North America:

Paleogeography, Paleoclimatology, Paleoecology, v. 84, p. 369-423.

Zen, E-an, Goldsmith, G.R., Ratcliffe, N.L., Robinson, P., and Stanley,

R.S., 1983, Bedrock geologic map of Massachusetts: U.S. Geological

Survey, Monograph Series, 3 map sheets, 1:250,000.

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Tabled descriptions of Attribute Fields:

Item name: HYDRO_BSN

Four major drainage basin areas are shown for the New England

study area:

BASIN NAME DEFINITION

CONN Connecticut, Houstanic, and Thames River drainage area

NECB New England Coastal Basin drainage area

N_MAINE Northern Maine drainage area

STL_HUD St. Lawrence and Hudson River drainage area

Item names = G_PROVINCE (name) and G_PROV_ID (id code)

The New England study area is divided into ten geologic

provinces, identified both by name (G_PROVINCE) and an identification

code (G_PROV_ID). Listed below are descriptions of the ten geologic

provinces by both name and identification code, in order from west to

east:

PROVINCE and ID DEFINITION

Grenville Belt

(Y)

Includes areas of Grenville Basement

(PreCambrian Y metamorphic rocks) in western

Connecticut, Massachusetts, and Vermont.

Principally granitic gneiss and metasedimentary

rocks. Includes some Cambrian metasedimentary

rocks deposited on Precambrian basement.

Grenville Shelf

Sequence

(S)

Principally carbonate rocks and other

metasedimentary rocks deposited in a carbonate

shelf sequence overlying Grenville basement in

western Connecticut, Massachusetts, and

Vermont.

Eugeosynclinal

Sequence

(H)

Includes slates and pelitic metamorphic rocks

in the Taconic Range and schists east of the

Grenville Belt. Principally Cambrian to

Ordovician pelitic metasedimentary rocks,

including metavolcanic layers and lenses of

ultramafic rocks.

Waits River-Gile Mtn.

(C)

Principally Devonian variably-calcareous

metasedimentary rocks in eastern Vermont and

the northern Connecticut valley in

Massachusetts, intruded by Devonian granite.

Mesozoic Basin

(N)

Triassic to Jurassic age sediments and basalt

flows deposited in localized rift basins in

central Connecticut and Massachusetts. Intruded

by Jurassic diabase and basalt dikes.

Bronson Hill Sequence

(B)

Localized along the eastern Connecticut valley

from Connecticut to western New Hampshire and

northern Maine. Principally Ordovician igneous

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and metavolcanic rocks overlain by Ordovician

to Devonian metasedimentary rocks. Sulfidic

schists and mafic rocks are common. Intruded by

Devonian granites.

New Hampshire-Maine

Sequence

(M)

Covers eastern Connecticut, central

Massachusetts, eastern New Hampshire, and

central Maine. Principally Silurodevonian

metasedimentary rocks and Silurodevonian and

younger igneous rocks, principally granite.

Coastal Maine

(CM)

Localized along northeastern coastal Maine.

Principally PreCambrian Z to Silurian

metasedimentary and metavolcanic rocks intruded

by Devonian granites.

Avalon Province

(Z)

Localized in eastern Massachusetts, Rhode

Island, and coastal Connecticut. Principally

Precambrian Z granite and granitic gneiss and

metasedimentary rocks of Precambrian Z to

Ordovician age. Intruded by Ordovician to

Devonian granites. Cretaceous sediments and

thick areas of Quaternary glacial sediments

occur in southern coastal areas.

Narragansett Basin

(NB)

Permian conglomerates and other sediments

deposited in fault-bounded basins in Avalon

province rocks in southeastern Massachusetts

and Rhode Island.

Item Names: Lithogeochemical Unit (Litho_code and Litho_mod)

This item represents the primary lithogeochemical classification

scheme used in this data set. Extended table attributes of these

lithogeochemical units, including chemical character of natural

waters and sensitivity to acid deposition and other habitat

characteristics, are described below in the following sections. For

individual definitions of Lithologic codes and modifier codes (not in

combination as lithogeochemical units), see “Entity and Attribute

Information” section under “Litho_code” and “Lith_mod”.

The following table lists the lithogeochemical units, with a column

order of:

1) Litho_code

2) Lith_mod

3) Rock Type (Rock Group B value, Rock Group B ID number)

4) Description

11 u

Carbonate Rocks

R_GpB_ID = 1

Rock type description: limestone, dolomite,

and carbonate-rich clastic sediments

Chemical character of natural waters: high

alkalinity and high calcium and bicarbonate

concentrations; neutral to high pH; may

have high concentrations of sulfate and

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solutes complexed by bicarbonate ions.

Sensitivity to acid deposition and other

habitat characteristics: low sensitivity to

acid deposition; flora favoring alkaline,

high-calcium soils may occur; productive

aquatic faunas

12 u

Carbonate Rocks

R_GpB_ID = 1

Rock type description: marble, including

dolomitic marble; may include some calc-

silicate rock

Chemical character of natural waters: high

alkalinity and high calcium and bicarbonate

concentrations; high pH; may have high

concentrations of sulfate and solutes

complexed by bicarbonate ions.

Sensitivity to acid deposition and other

habitat characteristics: low sensitivity to

acid deposition; flora favoring alkaline,

high-calcium soils may occur; productive

aquatic faunas

12 g

Carbonate Rocks

R_GpB_ID = 1

Rock_type_description: marble, including

dolomitic marble; may contains variable

amounts of graphite or organic materials

Chemical character of natural waters: high

alkalinity and high calcium and bicarbonate

concentrations; high pH; may have high

concentrations of sulfate and solutes

complexed by bicarbonate ions.

Sensitivity to acid deposition and other

habitat characteristics: low sensitivity to

acid deposition; flora favoring alkaline,

high-calcium soils may occur; productive

aquatic faunas

12 gc

Carbonate Rocks

R_GpB_ID = 1

Rock type description: marble; may contain

variable amounts of carbonate mineralsand

organic materials

Chemical character of natural waters: high

alkalinity and high calcium and bicarbonate

concentrations; neutral to high pH; may

have high concentrations of sulfate and

solutes complexed by bicarbonate ions.

Sensitivity to acid deposition and other

habitat characteristics: low sensitivity to

acid deposition; flora favoring alkaline,

high-calcium soils may occur; productive

aquatic faunas

12 gs

Carbonate Rocks

R_GpB_ID = 1

Rock type description: sulfidic marble; may

include some calc-silicate rock unit may

contain minor amounts of pyrite and (or)

pyrrhotite and (or) variable amounts of

organic materials, sufficient to cause a

rusty-weathering characteristic.

Chemical character of natural waters: high

alkalinity and high calcium and bicarbonate

concentrations; neutral to high pH; may

have high concentrations of sulfate and

solutes complexed by bicarbonate ions.

13

Sensitivity to acid deposition and other

habitat characteristics: low sensitivity to

acid deposition; flora favoring alkaline,

high-calcium soils may occur; productive

aquatic faunas

12 s

Carbonate Rocks

R_GpB_ID = 1

Rock type description: sulfidic marble; may

include some calc-silicate rock

Chemical character of natural waters: high

alkalinity and high calcium and bicarbonate

concentrations; neutral to high pH; may

have high concentrations of sulfate and

solutes complexed by bicarbonate ions.

Sensitivity to acid deposition and other

habitat characteristics: low sensitivity to

acid deposition; flora favoring alkaline,

high-calcium soils may occur; productive

aquatic faunas

13 u

Calpelites,

Carbonate Rocks

R_GpB_ID = 10, 1

Rock type description: calcareous clastic

and metaclastic rocks containing

approximately 15 to 45 percent carbonate

minerals

Chemical character of natural waters: high

alkalinity and high calcium and bicarbonate

concentrations; neutral to high pH; may

have high concentrations of sulfate and

solutes complexed by bicarbonate ions.

Sensitivity to acid deposition and other

habitat characteristics: low sensitivity to

acid deposition; flora favoring alkaline,

high-calcium soils may occur; productive

aquatic faunas

21 c

Basin Sedimentary

R_GpB_ID = 20, 21

Rock type description: calcareous, locally

sulfidic, gray mudstone; carbonate-poor,

clastic sedimentary restricted to distinct

depositional basins (bedded lithologies

below biotite-grade of regional

metamorphism)

Chemical character of natural waters:

generally high sodium and sometimes high

calcium and sulfate concentrations; ground

water may have moderate to high solute

concentrations where acidic or high sulfate

concentrations exist; iron concentrations

may be high in ground water where Eh and pH

are low; distinct ground-water types may be

localized within the area of the

depositional basin

Sensitivity to acid deposition and other

habitat characteristics: low to moderate

sensitivity to acid deposition; clay soils;

variably neutral to acidic; generally

lowlands with subdued topography in the

study area

22 u

Basin Sedimentary

R_GpB_ID = 20, 21

Rock type description: interbedded

mudstone, shale, and siltstone; may contain

sandstone; carbonate-poor, clastic

14

sedimentary rocks restricted to distinct

depositional basins (bedded lithologies

below biotite-grade of regional

metamorphism)

Chemical character of natural waters:

generally high sodium and sometimes high

calcium and sulfate concentrations; ground

water may have moderate to high solute

concentrations where acidic or high sulfate

concentrations exist; iron concentrations

may be high in ground water where Eh and pH

are low; distinct ground-water.

23 u

Basin Sedimentary

R_GpB_ID = 20, 21

Rock type description: sandstone and

interbedded sandstone and conglomerate; may

contain siltstone, shale, and mudstone;

primarily noncalcareous, clastic

sedimentary rocks with restricted

deposition in discrete fault-bounded

sedimentary basins of Mississipian or

younger age

Chemical character of natural waters:

variable Sensitivity to acid deposition and

other habitat characteristics: moderately

sensitivity to acid deposition

31 u

Pelitic Rocks

R_GpB_ID = 30

Rock type description: slate and greywacke;

primarily noncalcareous, clastic

sedimentary rocks at or above biotite-grade

of regional metamorphism.

Chemical character of natural waters: low

to moderate solute concentrations;

generally low calcium-to-sodium ratios;

variable potassium-to-sodium ratios; higher

calcium concentrations when slightly

calcareous

Sensitivity to acid deposition and other

habitat characteristics: moderate to high

sensitivity to acid deposition

31 c

Calcgranofels,

Pelitic Rocks

R_GpB_ID = 11, 30

Rock type description: slate and graywacke;

slightly calcareous, clastic sedimentary

rocks at or above biotite-grade of regional

metamorphism.

Chemical character of natural waters: low

to moderate solute concentrations; variable

potassium-to-sodium ratios; higher calcium

concentrations when slightly calcareous.

Sensitivity to acid deposition and other

habitat characteristics: moderate

sensitivity to acid deposition

31 gs

Pelitic Rocks

R_GpB_ID 30

Rock type description: graphitic and

sulfidic slate and greywacke; may include

some calc-silicate rock; may contain minor

amounts of pyrite and (or) pyrrhotite and

(or) variable amounts of organic materials,

sufficient to cause a rusty-weathering

characteristic

Chemical character of natural waters:

15

moderate solute concentrations; iron

concentrations may be high in ground water

where Eh and pH are low; sulfate

concentrations may be high

Sensitivity to acid deposition and other

habitat characteristics: sensitive to acid

deposition; endemic floras may occur in

acidic metal-rich soils over sulfide-rich

horizons

31 s

Pelitic Rocks,

Sulfidic Schists

R_GpB_ID = 30, 31

Rock type description: graphitic and

sulfidic slate and greywacke; primarily

noncalcareous, clastic sedimentary rocks at

or above biotite-grade of regional

metamorphism;

Chemical character of natural waters:

moderate solute concentrations; iron

concentrations may be high in ground water

where Eh and pH are low; sulfate

concentrations may be high

Sensitivity to acid deposition and other

habitat characteristics: sensitive to acid

deposition; endemic floras may occur in

acidic metal-rich soils over sulfide-rich

horizons

32 u

Pelitic Rocks

R_GpB_ID = 30

Rock type description: pelitic schist and

phyllite; may include granofels; primarily

noncalcareous, clastic sedimentary rocks

at or above biotite-grade of regional

metamorphism

Chemical character of natural waters: low

to moderate solute concentrations;

generally low calcium-to-sodium ratios;

variable potassium-to-sodium ratios; higher

calcium concentrations when slightly

calcareous

Sensitivity to acid deposition and other

habitat characteristics: moderate to high

sensitivity to acid deposition

32 c

Calcgranofels,

Metamorphic Rocks

R_GpB_ID = 11, 3

Rock type description: pelitic schist and

phyllite; may include granofels;

noncalcareous to slightly calcareous;

primarily noncalcareous to slightly

calcareous, clastic sedimentary rocks at or

above biotite-grade of regional

metamorphism

Chemical character of natural waters: low

to moderate solute concentrations;

generally low calcium-to-sodium ratios;

variable potassium-to-sodium ratios; higher

calcium concentrations when slightly

calcareous.

Sensitivity to acid deposition and other

habitat characteristics: low to moderate

sensitivity to acid depositio

32 gc

Metamorphic Rocks

R_GpB_ID = 3

Rock type description: pelitic schist and

phyllite; may include granofels; graphitic

16

and variably calcareous; primarily

noncalcareous, clastic sedimentary rocks at

or above biotite-grade of regional

metamorphism

Chemical character of natural waters:

moderate solute concentrations; iron

concentrations may be high in ground water

where Eh and pH are low;

Sensitivity to acid deposition and other

habitat characteristics: low to moderate

sesitivity to acid deposition

32 s

Sulfidic Schists

R_GpB_ID 31

Rock type description: sulfidic schist; may

include sulfidic granofels; primarily

noncalcareous, clastic sedimentary rocks

at or above biotite-grade of regional

metamorphism

Chemical character of natural waters:

moderate solute concentrations; iron

concentrations may be high in ground water

where Eh and pH are low; sulfate

concentrations may be high

Sensitivity to acid deposition and other

habitat characteristics: sensitive to acid

deposition; endemic floras may occur in

acidic metal-rich soils over sulfide-rich

horizons

33 u

Pelitic Rocks

R_GpB_ID = 30

Rock type description: mixed schist,

granofels, and gneiss; primarily

noncalcareous, clastic sedimentary rocks at

or above biotite-grade of regional

metamorphism

Chemical character of natural waters: low

to moderate solute concentrations;

generally low calcium-to-sodium ratios;

variable potassium-to-sodium ratios; higher

calcium concentrations when slightly

calcareous

Sensitivity to acid deposition and other

habitat characteristics: moderate to high

sensitivity to acid deposition

33 c

Calcgranofels,

Metamorphic Rocks

R_GpB_ID = 11, 3

Rock type description: mixed schist,

granofels, and gneiss; noncalcareous to

slightly calcareous; primarily clastic

sedimentary rocks at or above biotite-grade

of regional metamorphism

Chemical character of natural waters: low

to moderate solute concentrations; variable

potassium-to-sodium ratios; higher calcium

concentrations when slightly calcareous

Sensitivity to acid deposition and other

habitat characteristics: low to moderate

sensitivity to acid deposition

33 cs

Calcgranofels,

Metamorphic Rocks

R_GpB_ID = 11, 3

Rock type description: mixed schist,

granofels, and gneiss; noncalcareous to

slightly calcareous; variable accessory

sulfide minerals

17

primarily clastic sedimentary rocks at or

above

biotite-grade of regional metamorphism

Chemical character of natural waters: low

to moderate solute concentrations; variable

potassium-to-sodium ratios; higher calcium

concentrations when slightly calcareous

Sensitivity to acid deposition and other

habitat characteristics: low to moderate

sensitivity to acid deposition

33 s

Metamorphic Rocks,

Sulfidic Schists

R_GpB_ID = 3, 31

Rock type description: sulfide-bearing

schistose granofels and mixed schist and

gneiss (sulfidic character may be local);

primarily noncalcareous, clastic

sedimentary rocks at or above biotite-grade

of regional metamorphism

Chemical character of natural waters:

moderate solute concentrations; iron

concentrations may be high in ground water

where Eh and pH are low; sulfate

concentrations may be high

Sensitivity to acid deposition and other

habitat characteristics: moderately

sensitive to acid deposition; endemic

floras may occur in acidic metal-rich soils

over sulfide-rich horizons

34 u

Metamorphic Rocks

R_GpB_ID = 3

Rock type description: quartzose

metasandstone, quartzite,quartz granofels,

and quartzose gneiss; primarily

noncalcareous, clastic sedimentary rocks at

or above biotite-grade of regional

metamorphism

Chemical character of natural waters:

generally low solute concentrations; low

pH; high potassium-to-sodium ratios

Sensitivity to acid deposition and other

habitat characteristics: high sensitivity

to acid deposition

34 c

Calcgranofels,

Metamorphic Rocks

R_GpB_ID = 11, 3

Rock type description: quartzose

metasandstone, quartzite, quartz granofels,

and quartzose gneiss; primarily

noncalcareous, clastic sedimentary rocks at

or above biotite-grade of regional

metamorphism

Chemical character of waters: generally low

solute concentrations; low to neutral pH;

high potassium-to-sodium ratios

Sensitivity to acid deposition and other

habitat characteristics: moderate to high

sensitivity to acid deposition

34 cs

Metamorphic Rocks

R_GpB_ID = 3

Rock type description: quartzose

metasandstone, quartzite, quartz granofels,

and quartzose gneiss; contains variable

amounts of carbonate minerals, calc-

silicate minerals, calcareous and sulfidic

areas may be local; primarily

18

noncalcareous, clastic sedimentary rocks at

or above biotite-grade of regional

metamorphism

Chemical character of natural waters: low

to moderate solute concentrations; iron

concentrations may be high in ground water

where Eh and pH are low; sulfate

concentrations may be high

Sensitivity to acid deposition and other

habitat characteristics: moderate to high

sensitivity to acid deposition

41 u

Basalt

R_GpB_ID = 41

Rock type description: basalt

Chemical character of natural waters: high

calcium- and magnesium-to-sodium ratios;

variable silica concentrations (sometimes

high due to dissolution of reactive

silicates);

where Eh and pH are low, iron and manganese

concentrations are high

Sensitivity to acid deposition and other

habitat characteristics: low sensitivity to

acid deposition; may have endemic flora

favoring alkaline, high-magnesium and low-

potassium soils; productive aquatic faunas

where calcium is high in surface waters

42 u

Mafic Rocks

R_GpB_ID = 4

Rock type description: amphibolite,

greenstone, greenschist-facies

metavolcanics,and schistose mafic rock with

minor dispersed carbonate;

Chemical character of natural waters: high

calcium- and magnesium-to-sodium ratios;

variable silica concentrations (sometimes

high due to dissolution of reactive

silicates);

where Eh and pH are low, iron and manganese

concentrations are high

Sensitivity to acid deposition and other

habitat characteristics: low sensitivity to

acid deposition; may have endemic flora

favoring alkaline, high-magnesium and low-

potassium soils; productive aquatic faunas

where calcium is high in surface waters

43 u

Mafic Rocks

R_GpB_ID = 4

Rock type description: mafic gneiss and

mafic lithologies mixed with felsic

volcanics and(or) metaclastic lithologies

Chemical character of natural waters: high

calcium- and magnesium-to-sodium ratios;

variable silica concentrations (sometimes

high due to dissolution of reactive

silicates);

where Eh and pH are low, iron and manganese

concentrations are high

Sensitivity to acid deposition and other

habitat characteristics: low sensitivity to

acid deposition; may have endemic flora

favoring alkaline, high-magnesium and low-

19

potassium soils; productive aquatic faunas

where calcium is high in surface waters

43 s

Mafic Rocks

R_GpB_ID = 4

Rock type description: mafic gneiss and

mafic lithologies mixed with felsic

volcanics and(or) metaclastic lithologies;

sulfide-bearing units may be local

Chemical character of natural waters: high

calcium- and magnesium-to-sodium ratios;

variable silica concentrations (sometimes

high due to dissolution of reactive

silicates);

where Eh and pH are low, iron and manganese

concentrations are high

Sensitivity to acid deposition and other

habitat characteristics: low sensitivity to

acid deposition; may have endemic flora

favoring alkaline, high-magnesium and low-

potassium soils; productive aquatic faunas

where calcium is high in surface waters

44 u

Mafic Rocks

R_GpB_ID = 4

Rock type description: mafic plutonic

rocks, including gabbro, diorite,

monzodiorite, and diabase

Chemical character of natural waters: high

calcium- and magnesium-to-sodium ratios;

variable silica concentrations (sometimes

high due to dissolution of reactive

silicates);

where Eh and pH are low, iron and manganese

concentrations are high

Sensitivity to acid deposition and other

habitat characteristics: low sensitivity to

acid deposition; may have endemic flora

favoring alkaline, high-magnesium and low-

potassium soils; productive aquatic faunas

where calcium is high in surface waters

45 u

Mafic Rocks

R_GpB_ID = 4

Rock type description: mixed fine-grained

felsic, mafic and(or) intermediate volcanic

rocks

Chemical character of natural waters: low

to moderate solute concentrations; variable

concentrations of silica and major ions

Sensitivity to acid deposition and other

habitat characteristics: variable

50 u

Ultramafic Rocks

R_GpB_ID = 5

Rock type description: ultramafic rocks,

including serpentinites, dunites,

peridotites, and talc schists

Chemical character of natural waters: high

magnesium-to-calcium ratios; relatively

high silica concentrations due to

dissolution of reactive silicates; ground

water may have low Eh values and high metal

concentrations

Sensitivity to acid deposition and other

habitat characteristics: low sensitivity to

acid deposition; frequently has endemic

flora favoring high-magnesium, low-

20

potassium, alkaline soils

61 u

Grenville Granite

R_GpB_ID = 61

Avalon Granite

R_GpB_ID = 62

Peraluminous Gr.

R_GpB_ID = 63

Alkali Granite

R_GpB_ID = 64

Other Granite

R_GpB_ID = 6

Rock type description: granitoid plutonic

rocks, including granite, quartz monzonite,

granodiorite, tonalite, trondhjemite, and

equivalent gneiss

Chemical character of natural waters:

generally low solute concentrations;

relatively high bicarbonate and silica

concentrations; calcium and magnesium

concentrations generally are low;

relatively low pH; fluoride, uranium, and

radon

concentrations may be high

Sensitivity to acid deposition and other

habitat characteristics: high

61 v

Felsic Volcanics

R_GpB_ID = 60

Rock type description: fine-grained felsic

rocks of volcanic and subvolcanic origin;

includes feldspathic hypabyssal dikes and

flows

Chemical character of natural waters:

generally low solute concentrations;

relatively high bicarbonate and silica

concentrations; calcium and magnesium

concentrations generally are low; fluoride,

uranium, and radon concentrations may be

high

Sensitivity to acid deposition and other

habitat characteristics: high quartz

monzonite, granodiorite, trondhjemite, and

equivalent gneiss

62 u

Other Granite

R_GpB_ID = 6

Grenville Granite

R_GpB_ID = 61

Peraluminous Gr.

R_GpB_ID = 63

Rock type description: granitoid plutonic

rocks, including granite, quartz monzonite,

granodiorite, tonalite, trondhjemite, and

equivalent gneiss

Chemical character of natural waters:

generally low solute concentrations;

relatively high bicarbonate and silica

concentrations; calcium and magnesium

concentrations generally are low;

Sensitivity to acid deposition and other

habitat characteristics: high

62 n

Other Granite

R_GpB_ID = 6

Peraluminous Gr.

R_GpB_ID = 63

Rock type description: nepheline syenite,

granitoid plutonic rocks

Chemical character of natural waters:

generally low solute concentrations;

relatively high bicarbonate and silica

concentrations; calcium and magnesium

concentrations generally low; neutral to

relatively high pH ground water; fluoride,

uranium, and radon concentrations may be

high

Sensitivity to acid deposition and other

habitat characteristics: high

70 u

Unconsolidated

Sediments

R_GpB_ID = 7

Rock type description: unconsolidated or

poorly consolidated marine and(or) glacial

sediments

21

Chemical character of natural waters:

variable

Sensitivity to acid deposition and other

habitat characteristics: not applicable

Item Names: Rock_GpA and Rock_GpB

The dominant bedrock lithologies can be selected by the “Rock

Group A” item heading. The Rock Group A category contains 7 lithologic

categories and a category for freshwater. Rock Group A can be further

divided into more specific lithology groups, in the attribute Rock

Group B. The Rock Group B category contains 18 lithologic categories

and a category for freshwater. Below is an outline of all the major

(A) and minor (B) rock groups.

ROCK GROUP A = ROCK GROUP B =

Basin Sedimentary

Mesozoic Basin Sediments, Narragansett Basin

Sediments

Calcpelite Calcpelite

Carbonate Rocks Carbonate Rocks

Granite

Avalon Granite, Alkali Granite, Granite (other),

Grenville Granite, Peraluminous Granite, Felsic

Volcanics

Mafic Rocks Basalt, Mafic Rocks, Ultramafic Rocks

Metamorphic Rocks

Undivided

Calcgranofels, Pelitic Rocks, Sulfidic Schists,

Metamorphic Rocks (other)

Unconsolidated

Sediments

Unconsolidated Sediments

Water

The Rock Group fields categorize the 37 lithochemical units into

related groups with differing degrees of detail. Below is a listing of

the lithochemical units in each Rock Group:

Rock Group A (Rock_GpA), with the lithogeochemical unit(s) (litho_code

+ lith_mod) contained in each category:

ROCK GROUP A LITHOGEOCHEMICAL UNITS

Basin Sedimentary 21c, 22u, 23u

Calcpelite 13u, 34c

Carbonate Rocks 11u, 12u, 12g, 12gc, 12gs, 12s, 13u

Granite 61u, 61v, 62u, 62n

Mafic Rocks 41u, 42u, 43u, 43s, 44u, 45u, 50u

Metamorphic Rocks

Undivided

11u, 12u, 31u, 31c, 31gs, 31s, 32u, 32c, 2gc,

32s, 33u, 33c, 33cs, 33s, 34u, 34c, 34cs

Unconsolidated Sed. 70u

Water -9999 (none)

Rock Group B (Rock_GpB), ID (R_GpB_ID), and the lithogeochemical

unit(s) (litho_code + lith_mod) contained in each category:

22

ROCK GROUP B ID LITHOGEOCHEMICAL UNITS

Carbonate Rocks 1 11u, 12u, 12gs, 12s

Calcpelite 10 13u, 34c

Calcgranofels 11 31c, 32c, 33c, 34c, 34cs

Mesozoic Basin Sed. 20 21c, 22u, 23u

Narragansett Basin Sed. 21 23u

Metamorphic Rocks, other 3 33c, 34u, 34c, 34cs, 34s

Pelitic Rocks 30 31u, 31c, 31gs, 32u, 32c, 32gc, 33u

Sulfidic Schists 31 31s, 32s, 33cs, 33s

Mafic Rocks 4 41u, 42u, 43u, 43s, 44u, 45u

Basalt 41 41u

Ultramafic Rocks 5 50u

Granite, other 6 61u, 62u, 62n

Felsic volcanics 60 61v

Grenville Granite 61 61u

Avalon Granite 62 61u, 62u

Peraluminous Granite 63 61u

Alkali Granite 64 61u, 62u, 62n

Unconsolidated Sed. 70 70u

Water 0 -9999

Appendix_A:

Lithologic Descriptions by State:

State (column 1), Province (column 2), Rock Group B (column 3), Bedrock

Unit (column 4), Description (column 5).

Abbrevations used in the bedrock descriptions are from source

materials, for Connecticut, Rodgers and others, 1985 and Hermes and

others, 1994; for Massachusetts, Zen and others, 1983; for Maine,

Osberg and others, 1985 and Guidotti, 1985; for New Hampshire, Lyons

and others, 1997; for Rhode Island, Hermes and others, 1994. Geologic

and formation names listed below are the geologic names used on the

cited geologic base maps, which may not conform with the North American

Stratigraphic Code, with current usage, or with current U.S. Geological

Survey editorial standards. Current status of geologic name usage may

be obtained from the Internet at http://ngmdb.usgs.gov/Geolex/accessed

2/02/03.

Appendix A Table:

Connecticut

State Province Rock Group B Bedrock Unit Name/Description

CT

Grenville Belt Metamorphic Rocks, other Cc Cheshire Quartzite

CT

Grenville Belt Metamorphic Rocks, other Cd Dalton Formation

CT

Grenville Shelf

Sequence Metamorphic Rocks, other Cd Dalton Formation

23

State Province Rock Group B Bedrock Unit Name/Description

CT

Eugeosyncline Sequence Pelitic Rocks Ce Everett Schist

CT

Eugeosyncline Sequence Pelitic Rocks Ch Hoosac Schist

CT

Grenville Belt Pelitic Rocks Ch Hoosac Schist

CT

Eugeosyncline Sequence Pelitic Rocks Cm Manhattan Schist

CT

Grenville Shelf

Sequence Pelitic Rocks Cm Manhattan Schist

CT

Eugeosyncline Sequence Mafic Rocks Cma Manhattan Schist

CT

Grenville Belt Sulfidic Schists Cmcl

Manhattan Schist, Canaan Mtn.

Schist

CT

Eugeosyncline Sequence Sulfidic Schists Cmcu

Manhattan Schist, Canaan Mtn.

Schist

CT

Eugeosyncline Sequence Sulfidic Schists Cmcub

Manhattan Schist, Canaan Mtn.

Schist

CT

Grenville Shelf

Sequence Carbonate Rocks Csb Stockbridge Marble; unit b

CT

Grenville Shelf

Sequence Carbonate Rocks Csc Stockbridge Marble; unit c

CT

Eugeosyncline Sequence Granite, other Cwb Waterbury Gneiss

CT

NH-ME Sequence Mafic Rocks D?d quartz diorite

CT

Bronson Hill Sequence Pelitic Rocks Dbl Littleton Formation

CT

NH-ME Sequence Pelitic Rocks Dblm

Littleton Formation, Mount

Pisgah Mbr.

CT

NH-ME Sequence Granite, other Dc Canterbury Gneiss

CT

Avalon Belt Granite, other Dc Canterbury Gneiss

CT

NH-ME Sequence Granite, other Dce

Canterbury Gneiss, "Eastford

gneiss phase"

CT

Bronson Hill Sequence Pelitic Rocks De Erving Formation

CT

NH-ME Sequence Granite, other Dgg granite gneiss

CT

NH-ME Sequence Mafic Rocks Dl

Lebanon Gabbro (Lebanon

Granite)

CT

Bronson Hill Sequence Granite, other Dm Maromas Granite Gniess

CT

NH-ME Sequence Mafic Rocks Dn hornblende norite

CT

Eugeosyncline Sequence Granite, other Dng Nonewaug Granite

CT

NH-ME Sequence Pelitic Rocks DSs Scotland Schist

CT

Avalon Belt Pelitic Rocks DSs

Oakdale Formation, Scotland

Schist Mbr.

CT

NH-ME Sequence Metamorphic Rocks, other DSsq

Oakdale Formation, Scotland

Schist Mbr.

CT

Eugeosyncline Sequence Pelitic Rocks Dst

Hartland Belt; The Straits

Schist

CT

Eugeosyncline Sequence Pelitic Rocks DSw Wepawaug Schist

CT

Bronson Hill Sequence Basalt Jb Buttress Dolerite

CT

Mesozoic Basin Basalt Jb Buttress Dolerite

CT

Eugeosyncline Sequence Basalt Jb Buttress Dolerite

CT

Mesozoic Basin Mafic Rocks Jb? Buttress Dolerite

CT

Mesozoic Basin Mesozoic Basin Sed. Jeb East Berlin Formation

CT

Mesozoic Basin Mesozoic Basin Sed. Jeb East Berlin Formation

24

State Province Rock Group B Bedrock Unit Name/Description

CT

Mesozoic Basin Basalt Jha Hampden Basalt

CT

Eugeosyncline Sequence Basalt Jha Hampden Basalt

CT

Mesozoic Basin Basalt Jho Holyoke Basalt

CT

Mesozoic Basin Mesozoic Basin Sed. Jp Portland Arkose

CT

Mesozoic Basin Mesozoic Basin Sed. Jp? Portland Arkose

CT

Mesozoic Basin Mesozoic Basin Sed. Jp+Trnh (See Jp and Trnh descriptions)

CT

Mesozoic Basin Mesozoic Basin Sed. Jsm Shuttle Meadow Formation

CT

Mesozoic Basin Basalt Jta Talcott Basalt

CT

Mesozoic Basin Basalt Jwr West Rock Dolerite

CT

Mesozoic Basin Mafic Rocks Jwr West Rock Dolerite

CT

Eugeosyncline Sequence Mafic Rocks Jwr West Rock Dolerite

CT

Mesozoic Basin Mafic Rocks Jwr? West Rock Dolerite

CT

Eugeosyncline Sequence Mafic Rocks Oa+Oma

Allingtown metavolcanics and

Maltby Lakes metavolcanics

CT

Eugeosyncline Sequence Mafic Rocks Ob Brookfield Gneiss

CT

NH-ME Sequence Sulfidic Schists Obr Brimfield Schist

CT

NH-ME Sequence Sulfidic Schists Obr? Brimfield Schist

CT

NH-ME Sequence Mafic Rocks Obrg Brimfield Schist

CT

Eugeosyncline Sequence Metamorphic Rocks, other Obs Bristol Gneiss

CT

Eugeosyncline Sequence Pelitic Rocks Oc Collinsville Formation

CT

Eugeosyncline Sequence Pelitic Rocks Oc+Ot (See Oc and Ot descriptions)

CT

Eugeosyncline Sequence Mafic Rocks OC-r Rowe Schist

CT

Eugeosyncline Sequence Mafic Rocks OC-ra Rowe Schist; amphibolite mbr.

CT

Eugeosyncline Sequence Mafic Rocks OC-r+OC-ra

(See OC-r and OC-ra

descriptions)

CT

Grenville Shelf

Sequence Carbonate Rocks OC-s Stockbridge Marble

CT

Eugeosyncline Sequence Mafic Rocks Ocg Collinsville Formation

CT

Bronson Hill Sequence Sulfidic Schists Och Collins Hill Formation

CT

Bronson Hill Sequence Sulfidic Schists Och+Om (See Och and Om descriptions)

CT

Bronson Hill Sequence Mafic Rocks Ochv Collins Hill Formation

CT

Eugeosyncline Sequence Pelitic Rocks Ocm Cobble Mtn. Formation

CT

Eugeosyncline Sequence Pelitic Rocks Ocs

Collinsville Fm., Sweetheart

Mt. Mbr.

CT

Grenville Belt Granite, other Og granitic gneiss

CT

Eugeosyncline Sequence Granite, other Og granitic gneiss

CT

Eugeosyncline Sequence Granite, other Og? granitic gneiss

CT

Grenville Belt Grenville Granites Og+Yg (See Og and Yg descriptions)

CT

Eugeosyncline Sequence Pelitic Rocks Ogh Golden Hill Schist

CT

Eugeosyncline Sequence Pelitic Rocks Ogh? Golden Hill Schist

CT

Bronson Hill Sequence Granite, other Ogl Glastonbury Gneiss

CT

Eugeosyncline Sequence Mafic Rocks Oh Harrison Gneiss

25

State Province Rock Group B Bedrock Unit Name/Description

CT

Eugeosyncline Sequence Mafic Rocks Oh? Harrison Gneiss

CT

Eugeosyncline Sequence Mafic Rocks Ohb Harrison Gneiss, Beardsley Mbr.

CT

Eugeosyncline Sequence Calcgranofels Ohc Hawley Formation

CT

Eugeosyncline Sequence Mafic Rocks Ohp

Harrison Gneiss, Pumpkin Ground

Mbr.

CT

Eugeosyncline Sequence Mafic Rocks Ohp+Ob (See Ohp and Ob descriptions)

CT

Eugeosyncline Sequence Mafic Rocks Ohp+Oh (See Ohp and Oh descriptions)

CT

Eugeosyncline Sequence Mafic Rocks Ol Litchfield Norite

CT

Bronson Hill Sequence Mafic Rocks Om Middletown Formation

CT

NH-ME Sequence Mafic Rocks Om Middletown Formation

CT

Eugeosyncline Sequence Mafic Rocks Omal Maltby Lakes Metavolcanics

CT

Eugeosyncline Sequence Mafic Rocks Omau Maltby Lakes Metavolcanics

CT

Bronson Hill Sequence Mafic Rocks Omm Middletown Formation

CT

Bronson Hill Sequence Mafic Rocks Omo Monson Gneiss

CT

Bronson Hill Sequence Mafic Rocks Omo+Oml+Och

(See Omo, Oml, and Och

descriptions)

CT

Bronson Hill Sequence Pelitic Rocks Omu Middletown Formation

CT

Bronson Hill Sequence Pelitic Rocks Omu Middletown Formation

CT

Eugeosyncline Sequence Pelitic Rocks Oo Oronoque Schist

CT

Avalon Belt Mafic Rocks Op Preston Gabbro

CT

Avalon Belt Mafic Rocks Op+Oq (See Op and Oq)

CT

Avalon Belt Mafic Rocks Opd Preston Gabbro

CT

Avalon Belt Mafic Rocks Oq Quinebaug Formation

CT

NH-ME Sequence Mafic Rocks Oq Quinebaug Formation

CT

Avalon Belt Granite, other Oqf Quinebaug Formation

CT

Eugeosyncline Sequence Pelitic Rocks Or Ratlum Mtn. Schist

CT

Eugeosyncline Sequence Pelitic Rocks Or+OC-r+Ora (See Or, OC-r, and Ora)

CT

Eugeosyncline Sequence Mafic Rocks Ora Ratlum Mtc. Schist

CT

Grenville Shelf

Sequence Carbonate Rocks Ose Stockbridge Marble

CT

Eugeosyncline Sequence Pelitic Rocks Ot Taine Mtn. Formation

CT

Eugeosyncline Sequence Pelitic Rocks

O

t+Otb+Oc+ (See Ot, Otb, Oc, and DSts)

DSts

CT

Avalon Belt Pelitic Rocks Ota Tatnic Hill Formation

CT

Avalon Belt Metamorphic Rocks, other Ota+SOh (See Ota and SOh)

CT

Eugeosyncline Sequence Granite, other Otf+Og (See Otf and Og)

CT

Eugeosyncline Sequence Sulfidic Schists Otfc

Trap Falls Formation,

Carringtons Pond Mbr.

CT

Eugeosyncline Sequence Pelitic Rocks Otfg Trap Falls Formation

CT

Eugeosyncline Sequence Pelitic Rocks Otfg+Otfs+ (See Otfg, Otfs, and Otf)

Otf

CT

Eugeosyncline Sequence Pelitic Rocks Otfs

Trap Falls Formation, Shelton

Mbr.

26

State Province Rock Group B Bedrock Unit Name/Description

CT

Eugeosyncline Sequence Pelitic Rocks Ots

Taine Mtn. Formation, Scranton

Mtn. Mbr.

CT

Eugeosyncline Sequence Pelitic Rocks Otw

Taine Mtn. Formation, Wildcat

Mbr.

CT

Eugeosyncline Sequence Pelitic Rocks Otwv Whigville Mbr.

CT

Grenville Shelf

Sequence Pelitic Rocks Ow Walloomsac Schist

CT

Grenville Shelf

Sequence Pelitic Rocks Ow Walloomsac Schist

CT

Grenville Shelf

Sequence Carbonate Rocks Owm Walloomsac Schist

CT

Avalon Belt Peraluminous Granite Pn Narragansett Pier Granite

CT

Eugeosyncline Sequence Granite, other Pp porphyry

CT

Eugeosyncline Sequence Granite, other Ppa Pinewood Adamallite

CT

Avalon Belt Peraluminous Granite Pw Westerly Granite

CT

Avalon Belt Mafic Rocks Pzmy mylonite along Paleozoic faults

CT

Avalon Belt Unconsolidated Sed. Qal Unconsolidated sediments

CT

Bronson Hill Sequence Metamorphic Rocks, other Sbc Clough Quartzite

CT

Bronson Hill Sequence Metamorphic Rocks, other Sbf Fitch Formation

CT

NH-ME Sequence Sulfidic Schists SObu Bigelow Brook Fm., upper member

CT

NH-ME Sequence Calcgranofels SOh

Hebron Gneiss (Hebron

Formation)

CT

Avalon Belt Metamorphic Rocks, other SOh

Hebron Gneiss (Hebron

Formation)

CT

Avalon Belt Metamorphic Rocks, other SOh

Hebron Gneiss (Hebron

Formation)

CT

NH-ME Sequence Calcgranofels

SOh+Ota+Otaf+

Otay+SObu

(See SOh, Ota, Otaf, Otay,

SObu)

CT

NH-ME Sequence Granite, other SOsp Southbridge Formation

CT

Eugeosyncline Sequence Metamorphic Rocks, other Stb Straits Schist

CT

Mesozoic Basin Mesozoic Basin Sed. Trnh New Haven Arkose

CT

Mesozoic Basin Mesozoic Basin Sed. Trnh New Haven Arkose

CT

Mesozoic Basin Mafic Rocks Trnh+Jb (See Trnh and Jb)

CT

Mesozoic Basin Mesozoic Basin Sed. Trnh+Jsm+Jta (See Trnh, Jsm, and Jta)

CT

Grenville Belt Ultramafic Rocks u Ultramafic rock

CT

Eugeosyncline Sequence Ultramafic Rocks u Ultramafic rock

CT

Grenville Belt Grenville Granites Yg

granitic gneiss, gneiss, and

schist

CT

Grenville Belt Grenville Granites Yga augen gneiss

CT

Grenville Belt Mafic Rocks Ygh

hornblende gneiss and

amphibolite

CT

Grenville Belt Metamorphic Rocks, other Ygn gneiss

CT

Grenville Belt Grenville Granites Ygr granitic gneiss

CT

Grenville Belt Grenville Granites Ygr+Yga (See Ygr and Yga)

CT

Grenville Belt Sulfidic Schists Ygs

mica schist and gneiss

porphyroclasts

CT

Avalon Belt Avalon Granite Zl

Sterling Plutonic Suite

(Group), LightHouse Gneiss

27

State Province Rock Group B Bedrock Unit Name/Description

CT

Avalon Belt Metamorphic Rocks, other Zp Plainfield Formation

CT

Avalon Belt Avalon Granite Zp+Zsc+Pn (See Zp, Zsc, and Pn)

CT

Avalon Belt Avalon Granite Zp+Zsph+Pn (See Zp, Zsph, and Pn)

CT

Avalon Belt Granite, other Zp+Zsph+Pn? (See Zp, Zsph, and Pn)

CT

Avalon Belt Metamorphic Rocks, other Zpq

Quartzite unit in Plainfield

Formation

CT

Avalon Belt Avalon Granite Zsc+Pn+Zw (See Zsc, Pn and Zw)

CT

Avalon Belt Granite, other Zsc+Pn+Zw (See Zsc, Pn and Zw)

CT

Avalon Belt Avalon Granite Zsh Hope Valley Alaskite Gneiss

CT

Avalon Belt Avalon Granite Zsh+Pnm (See Zsh and Pnm)

CT

Avalon Belt Avalon Granite Zsph

Sterling Plutonic Suite, Potter

Hill Granite

CT

Avalon Belt Avalon Granite Zsph+Pn

Sterling Plutonic Suite, Potter

Hill Granite

CT

Avalon Belt Granite, other Zsph+Pn

Sterling Plutonic Suite, Potter

Hill Granite

CT

Avalon Belt Avalon Granite Zss Scituate Granite Gneiss

CT

Avalon Belt Mafic Rocks Zw Waterford Group

CT

Avalon Belt Avalon Granite Zw+Zb Waterford Group

CT

Avalon Belt Avalon Granite Zwm

Waterford Group: Mamacoke

Formation

CT

Avalon Belt Metamorphic Rocks, other Zwn

Waterford Group, New London

Gneiss

CT

Avalon Belt Avalon Granite Zwnj

Waterford Group, New London

Gneiss

CT

Avalon Belt Avalon Granite Zwr

Waterford Group, Rope Ferry

Gneiss

CT

Avalon Belt Avalon Granite Zwr+Zwm (See Zwr and Zwm)

Massachusetts

MA

Avalon Belt Pelitic Rocks C-bw

Braintree Argillite and

Weymouth Fmargillite

MA

Grenville Belt Metamorphic Rocks, other C-c Cheshire quartzite

MA

Grenville Belt Metamorphic Rocks, other C-c+C-Zd (See C-c and C-Zd)

MA

Avalon Belt Pelitic Rocks C-g

Green Lodge Fm of Rhodes and

Graves(1931)

MA

Avalon Belt Pelitic Rocks C-h Hoppin Fm

MA

Eugeosyncline Sequence Pelitic Rocks C-hh Hatch Hill Formation

MA

Grenville Shelf

Sequence Metamorphic Rocks, other C-sa Stockbridge Fm

MA

Grenville Shelf

Sequence Carbonate Rocks C-sb Stockbridge Fm

MA

Grenville Shelf

Sequence Carbonate Rocks C-sc calcitic dolomite marble

28

State Province Rock Group B Bedrock Unit Name/Description

MA

Eugeosyncline Sequence Pelitic Rocks C-sc calcitic dolomite marble

MA

Eugeosyncline Sequence Pelitic Rocks C-Zcm Canaan Mountain Fm

MA

Grenville Belt Pelitic Rocks C-Zd Dalton Fm

MA

Grenville Belt Metamorphic Rocks, other C-Zd Dalton Fm

MA

Grenville Belt Metamorphic Rocks, other C-Zdbs Dalton Fm

MA

Grenville Belt Metamorphic Rocks, other C-Zdbs+C-Zd (See C-Zdbs and C-Zd)

MA

Grenville Belt Metamorphic Rocks, other C-Zdc Dalton Fm

MA

Grenville Belt Metamorphic Rocks, other C-Zdq Dalton Fm

MA

Grenville Belt Metamorphic Rocks, other C-Zds Dalton Fm

MA

Eugeosyncline Sequence Pelitic Rocks C-Zev Everett Fm

MA

Eugeosyncline Sequence Pelitic Rocks C-Zev Everett Fm

MA

Grenville Shelf

Sequence Pelitic Rocks C-Zev Everett Fm

MA

Grenville Shelf

Sequence Pelitic Rocks C-Zev+Ow

Part of Everett and Walloomsac

formations

MA

Eugeosyncline Sequence Pelitic Rocks C-Zevc Everett Fm

MA

Eugeosyncline Sequence Pelitic Rocks C-Zg Greylock Schist

MA

Eugeosyncline Sequence Pelitic Rocks C-Zg Greylock Schist

MA

Eugeosyncline Sequence Pelitic Rocks C-Zga Greylock Schist

MA

Grenville Shelf

Sequence Pelitic Rocks C-Zga Greylock Schist

MA

Eugeosyncline Sequence Pelitic Rocks C-Zh Hoosac Fm; undifferentiated

MA

Grenville Belt Pelitic Rocks C-Zh Hoosac Fm; undifferentiated

MA

Eugeosyncline Sequence Pelitic Rocks C-Zh Hoosac Fm; undifferentiated

MA

Grenville Belt Pelitic Rocks C-Zhd Hoosac Fm

MA

Grenville Belt Pelitic Rocks C-Zhdc Hoosac Fm

MA

Eugeosyncline Sequence Pelitic Rocks C-Zhg Hoosac Fm

MA

Grenville Belt Pelitic Rocks C-Zhg Hoosac Fm

MA

Eugeosyncline Sequence Pelitic Rocks C-Zhga Hoosac Fm

MA

Grenville Belt Pelitic Rocks C-Zhga Hoosac Fm

MA

Grenville Belt Metamorphic Rocks, other C-Zhga Hoosac Fm

MA

Grenville Belt Pelitic Rocks C-Zhgt lustrous greenish-gray schist

MA

Eugeosyncline Sequence Pelitic Rocks C-Zhr Hoosac Fm

MA

Eugeosyncline Sequence Pelitic Rocks C-Zn Nassau Fm

MA

Eugeosyncline Sequence Pelitic Rocks C-Zna Nassau Fm

MA

Eugeosyncline Sequence Pelitic Rocks C-Zngy Nassau Fm

MA

Eugeosyncline Sequence Pelitic Rocks C-Znp Nassau Fm

MA

Eugeosyncline Sequence Pelitic Rocks C-Znr

Nassau Fm; Rensselaer Graywacke

member

MA

Bronson Hill Sequence Ultramafic Rocks C-Znr

Nassau Fm; Rensselaer Graywacke

member

MA

Eugeosyncline Sequence Pelitic Rocks C-Znv Nassau Fm

29

State Province Rock Group B Bedrock Unit Name/Description

MA

Eugeosyncline Sequence Mafic Rocks C-Znv Nassau Fm

MA

NH-ME Sequence Mafic Rocks Dbi Belchertown Complex

MA

Bronson Hill Sequence Mafic Rocks Dbmdg Belchertown Complex

MA

Bronson Hill Sequence Mafic Rocks Dbp Belchertown Complex

MA

Bronson Hill Sequence Mafic Rocks Dbt Belchertown Complex

MA

NH-ME Sequence Peraluminous Granite Dcgr Chelmsford granite

MA

NH-ME Sequence Granite, other Dchgr

Coys Hill porphyritic granite

gneiss

MA

NH-ME Sequence Mafic Rocks Dchh

Coys Hill porphyritic granite

gneiss

MA

Avalon Belt Granite, other Dcygr Cherry Hill Granite

MA

NH-ME Sequence Mafic Rocks Ddi Hardwick Tonalite

MA

Bronson Hill Sequence Mafic Rocks Ddi Hardwick Tonalite

MA

NH-ME Sequence Mafic Rocks Ddi Hardwick Tonalite

MA

NH-ME Sequence Mafic Rocks Ddi+Ddn Hardwick Tonalite

MA

NH-ME Sequence Mafic Rocks Ddn Hardwick Tonalite

MA

Bronson Hill Sequence Pelitic Rocks De Erving Fm

MA

Bronson Hill Sequence Mafic Rocks Dea Erving Fm

MA

Bronson Hill Sequence Pelitic Rocks Deg Erving Fm

MA

Bronson Hill Sequence Sulfidic Schists Dev Erving Fm

MA

NH-ME Sequence Granite, other Dfgd Fitchburg Complex

MA

NH-ME Sequence Granite, other Dfgds Fitchburg Complex

MA

NH-ME Sequence Granite, other Dfgr Fitchburg Complex

MA

NH-ME Sequence Granite, other Dfgrg Fitchburg Complex

MA

Waits River-Gile Mtn. Pelitic Rocks Dg Goshen Fm

MA

Waits River-Gile Mtn. Calcpelite Dgc Goshen Fm

MA

NH-ME Sequence Granite, other Dgd Granodiorite

MA

Waits River-Gile Mtn. Calcpelite Dgl Goshen Fm

MA

Waits River-Gile Mtn. Calcpelite Dgm Gile Mountain Fm

MA

Waits River-Gile Mtn. Calcpelite Dgm+Dgma Gile Mountain Fm

MA

Waits River-Gile Mtn. Mafic Rocks Dgma Gile Mountain Fm

MA

Waits River-Gile Mtn. Pelitic Rocks Dgq Goshen Fm

MA

Waits River-Gile Mtn. Metamorphic Rocks, other Dgq Goshen Fm

MA

NH-ME Sequence Granite, other Dgr

Biotite-muscovite granite,

slightly foliated

MA

Waits River-Gile Mtn. Calcgranofels Dgu Goshen Fm

MA

Waits River-Gile Mtn. Calcgranofels Dgu+Dga (See Dgu and Dga)

MA

NH-ME Sequence Sulfidic Schists Dhgr Hardwick Tonalite

MA

NH-ME Sequence Mafic Rocks Dht Hardwick Tonalite

MA

NH-ME Sequence Mafic Rocks Dht Hardwick Tonalite

MA

NH-ME Sequence Pelitic Rocks DI Littleton Fm

30

State Province Rock Group B Bedrock Unit Name/Description

MA

Bronson Hill Sequence Pelitic Rocks Dl Littleton Fm

MA

NH-ME Sequence Pelitic Rocks Dl Littleton Fm

MA

NH-ME Sequence Pelitic Rocks Dl+Ops (See Dl and Ops)

MA

NH-ME Sequence Pelitic Rocks Dlf Littleton Fm

MA

NH-ME Sequence Metamorphic Rocks, other Dlf Littleton Fm

MA

NH-ME Sequence Calcgranofels Dlm Littleton Fm

MA

NH-ME Sequence Metamorphic Rocks, other Dlo Littleton Fm

MA

Eugeosyncline Sequence Granite, other Dmg Middlefield Granite

MA

Waits River-Gile Mtn. Granite, other Dpe

Feldspar-quartz-muscovite

pegmatite

MA

Eugeosyncline Sequence Granite, other Dpe

Feldspar-quartz-muscovite

pegmatite

MA

Bronson Hill Sequence Mafic Rocks Dpgb Prescott Complex

MA

Bronson Hill Sequence Granite, other Dpgg

Prescott Complex; Cooleyville

granitic gneiss

MA

Avalon Belt Granite, other Dpgr Peabody Granite

MA

Waits River-Gile Mtn. Pelitic Rocks Dpv Putney volcanics;

MA

Avalon Belt Granite, other Drgr Granite of Rattlesnake Hill

MA

NH-ME Sequence Granite, other Drh

Biotite-garnet-feldspar gneiss

of Ragged Hill

MA

NH-ME Sequence Mafic Rocks DSdi Diorite and tonalite

MA

Avalon Belt Felsic Volcanics DSn Newbury Volcanic Complex

MA

Avalon Belt Mafic Rocks DSna Newbury Volcanic Complex

MA

Avalon Belt Mafic Rocks DSnl Newbury Volcanic Complex

MA

Avalon Belt Felsic Volcanics DSnr Newbury Volcanic Complex

MA

NH-ME Sequence Pelitic Rocks DSw Worcester Fm

MA

Waits River-Gile Mtn. Calcpelite Dw Wenham Monzonite

MA

Waits River-Gile Mtn. Mafic Rocks Dwa Waits River Fm

MA

Waits River-Gile Mtn. Granite, other Dwgd Williamsburg Granodiorite

MA

Bronson Hill Sequence Granite, other Dwgd Williamsburg Granodiorite

MA

Avalon Belt Granite, other Dwm Wenham Monzonite

MA

Avalon Belt Felsic Volcanics DZl Lynn Volcanic Complex

MA

NH-ME Sequence Mafic Rocks gb Hornblende-olivine gabbro

MA

Bronson Hill Sequence Metamorphic Rocks, other gf Belchertown Complex

MA

NH-ME Sequence Granite, other gr Granite, mostly non-foliated

MA

NH-ME Sequence Granite, other grg Biotite granitic gneiss

MA

Bronson Hill Sequence Granite, other grg Biotite granitic gneiss

MA

NH-ME Sequence Sulfidic Schists hg Hornblende plagioclase gneiss

MA

Avalon Belt Granite, other igd

Granodiorite of the Indian head

pluton

MA

NH-ME Sequence Basalt Jd Diabase dikes and sills

MA

Bronson Hill Sequence Basalt Jd Diabase dikes and sills

31

State Province Rock Group B Bedrock Unit Name/Description

MA

Avalon Belt Basalt Jd Diabase dikes and sills

MA

Mesozoic Basin Basalt Jd Diabase dikes and sills

MA

Mesozoic Basin Basalt Jdb Deerfield Basalt

MA

Mesozoic Basin Mesozoic Basin Sed. Je East Berlin Fm

MA

Mesozoic Basin Basalt Jgb Granby Basaltic Tuff

MA

Mesozoic Basin Basalt Jhab Hampden Basalt

MA

Mesozoic Basin Basalt Jhb Holyoke Basalt

MA

Mesozoic Basin Mesozoic Basin Sed. Jmc Mount Toby Fm

MA

Mesozoic Basin Mesozoic Basin Sed. Jmg Mount Toby Fm

MA

Mesozoic Basin Mesozoic Basin Sed. Jn New Haven Arkose

MA

Mesozoic Basin Mesozoic Basin Sed. Jp Portland Formation

MA

Mesozoic Basin Mesozoic Basin Sed. Jpc

Portland Formation (western

part)

MA

Mesozoic Basin Mesozoic Basin Sed. Jpc

Portland Formation (western

part)

MA

Mesozoic Basin Mesozoic Basin Sed. Js Sugarloaf Fm

MA

NH-ME Sequence Metamorphic Rocks, other Jsi

Silicified fault-breccia or

strongly silified metamorphic

rocks

MA

Mesozoic Basin Mesozoic Basin Sed. Jsm Shuttle Meadow Formation

MA

Mesozoic Basin Mesozoic Basin Sed. Jsmc Shuttle Meadow Formation

MA

Mesozoic Basin Mesozoic Basin Sed. Jt Turner Falls Sandstone

MA

Mesozoic Basin Mesozoic Basin Sed. Jtc Turner Falls Sandstone

MA

Avalon Belt Unconsolidated Sed. K Cretaceous sediments

MA

Avalon Belt Granite, other mgr Light-gray muscovite granite

MA

Bronson Hill Sequence Mafic Rocks Oa Ammonoosuc Volcanics

MA

Bronson Hill Sequence Ultramafic Rocks Oau Ammonoosuc Volcanics

MA

Eugeosyncline Sequence Pelitic Rocks Oca Cobble Mtn. Fm

MA

Eugeosyncline Sequence Pelitic Rocks Ocb Cobble Mtn. Fm

MA

Eugeosyncline Sequence Pelitic Rocks Ocbr Cobble Mtn. Fm

MA

Eugeosyncline Sequence Pelitic Rocks Occa Cobble Mtn. Fm

MA

Eugeosyncline Sequence Mafic Rocks Oco Collinsville Fm

MA

Eugeosyncline Sequence Mafic Rocks Ocoa1 Collinsville Fm

MA

Eugeosyncline Sequence Pelitic Rocks OCr Rowe Schist

MA

Eugeosyncline Sequence Mafic Rocks OCra Rowe Schist

MA

Eugeosyncline Sequence Sulfidic Schists OCrc Rowe Schist

MA

Eugeosyncline Sequence Mafic Rocks Ogd Diorite at Golf Ledges

MA

Bronson Hill Sequence Granite, other Ogl Glastonbury Gneiss

MA

Grenville Belt Granite, other Ogr

muscovite-biotite granite and

granodiorite

MA

Eugeosyncline Sequence Granite, other Ogr

muscovite-biotite granite and

granodiorite

32

State Province Rock Group B Bedrock Unit Name/Description

MA

Eugeosyncline Sequence Mafic Rocks Oh Hawley Fm

MA

Eugeosyncline Sequence Sulfidic Schists Ohb Hawley Fm

MA

Eugeosyncline Sequence Mafic Rocks Ohg Hawley Fm

MA

Eugeosyncline Sequence Granite, other Ohpg Gneiss at Hallockville Pond

MA

Eugeosyncline Sequence Pelitic Rocks Om+C-Zd+O-cr (See Om, C-Zd, O-cr)

MA

Eugeosyncline Sequence Granite, other Om Moretown Fm

MA

Eugeosyncline Sequence Mafic Rocks Oma Moretown Fm

MA

Eugeosyncline Sequence Sulfidic Schists Omsc Moretown Fm

MA

Avalon Belt Mafic Rocks Ongb

Nahant Gabbro and gabbro at

Salem Neck

MA

NH-ME Sequence Mafic Rocks Opa Partridge Fm

MA

NH-ME Sequence Mafic Rocks Opa Partridge Fm

MA

Bronson Hill Sequence Metamorphic Rocks, other Opau Partridge Fm

MA

NH-ME Sequence Metamorphic Rocks, other Opau Partridge Fm

MA

NH-ME Sequence Metamorphic Rocks, other Opbg Partridge Fm

MA

Bronson Hill Sequence Granite, other Opc Pauchaug Gneiss

MA

Bronson Hill Sequence Metamorphic Rocks, other Opf Partridge Fm

MA

Bronson Hill Sequence Sulfidic Schists Ops Partridge Fm

MA

NH-ME Sequence Sulfidic Schists Ops Partridge Fm

MA

NH-ME Sequence Sulfidic Schists Ops Partridge Fm

MA

Bronson Hill Sequence Sulfidic Schists Ops+Sc (See Ops and Sc)

MA

NH-ME Sequence Sulfidic Schists Opsa Partridge Fm

MA

Bronson Hill Sequence Sulfidic Schists Opsa Partridge Fm

MA

NH-ME Sequence Pelitic Rocks Opsg Partridge Fm

MA

Bronson Hill Sequence Ultramafic Rocks Opu Partridge Fm

MA

NH-ME Sequence Ultramafic Rocks Opu Partridge Fm

MA

NH-ME Sequence Mafic Rocks Opv Partridge Fm

MA

NH-ME Sequence Mafic Rocks Opv Partridge Fm

MA

Grenville Shelf

Sequence Carbonate Rocks Ose Stockbridge Fm

MA

Grenville Shelf

Sequence Carbonate Rocks Ose Stockbridge Fm

MA

Grenville Shelf

Sequence Carbonate Rocks

Ose+Osg+C-

sb+C-sa (See Ose, Osg, C-sb, C-sa)

MA

Grenville Shelf

Sequence Carbonate Rocks Osg Stockbridge Fm

MA

Eugeosyncline Sequence Pelitic Rocks Otb Tectonic breccia

MA

Eugeosyncline Sequence Pelitic Rocks Otbl Tectonic breccia

MA

Grenville Belt Granite, other Otr

White, magnetite-bearing

alaskite and trondhjemite

MA

Grenville Shelf

Sequence Pelitic Rocks Ow Walloomsac Fm

MA

Grenville Shelf

Sequence Carbonate Rocks Owl Walloomsac Fm

33

State Province Rock Group B Bedrock Unit Name/Description

MA

Grenville Shelf

Sequence Carbonate Rocks Owm Walloomsac Fm

MA

Grenville Shelf

Sequence Calcgranofels Owq Walloomsac Fm

MA

Avalon Belt Metamorphic Rocks, other OZf Fish Brook Gneiss

MA

Bronson Hill Sequence Granite, other OZfm Fourmile Gneiss

MA

Bronson Hill Sequence Metamorphic Rocks, other OZfmq Fourmile Gneiss

MA

Avalon Belt Mafic Rocks OZm Marlboro Fm

MA

NH-ME Sequence Granite, other OZma Massabesic Gneiss Complex

MA

Avalon Belt Mafic Rocks OZmg Marlboro Fm

MA

Bronson Hill Sequence Mafic Rocks OZmo Monson Gneiss

MA

Bronson Hill Sequence Granite, other OZmo Monson Gneiss

MA

Bronson Hill Sequence Mafic Rocks OZmoa Nashoba Fm

MA

Bronson Hill Sequence Ultramafic Rocks OZmou Monson Gneiss

MA

Avalon Belt Metamorphic Rocks, other OZn Nashoba Fm

MA

Avalon Belt Mafic Rocks OZnb Nashoba Fm

MA

Avalon Belt Metamorphic Rocks, other OZsh Shawsheen Gneiss

MA

Avalon Belt Mafic Rocks OZt Tatnic Hill Fm

MA

Avalon Belt Metamorphic Rocks, other OZtf Tatnic Hill Fm; Fly Pond Mbr

MA

NH-ME Sequence Pelitic Rocks OZty Tatnic Hill Fm; Yantic Mbr

MA

Grenville Belt Ultramafic Rocks OZu Serpentinized peridotite stocks

MA

NH-ME Sequence Pelitic Rocks Pcm Coal Mine Brook Fm

MA

Narragansett Basin Narragansett Basin Sed. Pd Dighton Conglomerate

MA

NH-ME Sequence Peraluminous Granite Pgr

Biotite granite, with

magnetite-bearing pegmatite

MA

NH-ME Sequence Pelitic Rocks Ph Harvard Conglomerate

MA

Narragansett Basin Narragansett Basin Sed. Pp Pondville Conglomerate

MA

Narragansett Basin Narragansett Basin Sed. Pr Rhode Island Fm

MA

Narragansett Basin Narragansett Basin Sed. Prc Rhode Island Fm

MA

Narragansett Basin Narragansett Basin Sed. Pw Wamsutta Fm

MA

Narragansett Basin Narragansett Basin Sed. Pwv Wamsutta Fm

MA

Narragansett Basin Narragansett Basin Sed. PZb Bellingham Conglomerate

MA

Avalon Belt Pelitic Rocks PzZc Cambridge Argillite

MA

Avalon Belt Pelitic Rocks PzZr Roxbury Conglomerate

MA

Avalon Belt Pelitic Rocks PzZrb Roxbury Conglomerate

MA

NH-ME Sequence Mafic Rocks qd Quartz diorite

MA

NH-ME Sequence Granite, other Sacgr Ayer Granite

MA

NH-ME Sequence Granite, other Sagr Ayer Granite

MA

Avalon Belt Granite, other Sagr Ayer Granite

MA

NH-ME Sequence Calcpelite Sb Berwick Fm

MA

NH-ME Sequence Calcgranofels Sb Berwick Fm

34

State Province Rock Group B Bedrock Unit Name/Description

MA

NH-ME Sequence Sulfidic Schists Sbs Berwick Fm

MA

Bronson Hill Sequence Metamorphic Rocks, other Sc Clough Quartzite

MA

NH-ME Sequence Calcgranofels Se Eliot Fm

MA

Bronson Hill Sequence Calcgranofels Sf Fitch Fm

MA

NH-ME Sequence Sulfidic Schists Sfs Fitch Fm

MA

NH-ME Sequence Sulfidic Schists Sfss Fitch Fm

MA

Avalon Belt Granite, other Sgr

Rusty-weathering biotite

granite to granodiorite

MA

NH-ME Sequence Granite, other Sngr Newburyport Complex

MA

NH-ME Sequence Calcpelite So Oakdale Fm

MA

NH-ME Sequence Granite, other SOad

Ayer Granite--Devens-Long Pond

facies

MA

Avalon Belt Granite, other SOagr Andover Granite

MA

Avalon Belt Granite, other SObgr Blue Hill Granite

MA

Avalon Belt Sulfidic Schists SObo Bolyston Schist

MA

NH-ME Sequence Sulfidic Schists SObo Bolyston Schist

MA

Avalon Belt Granite, other SOcb

Cape Ann Complex: Beverly

Syenite

MA

Avalon Belt Granite, other SOcgr Cape Ann Complex

MA

Avalon Belt Granite, other SOcsm Cape Ann Complex: Squam Granite

MA

NH-ME Sequence Granite, other SOngd Newburyport Complex

MA

Avalon Belt Granite, other SOqgr Quincy Granite

MA

NH-ME Sequence Metamorphic Rocks, other SOvh Vaughn Hills Quartzite

MA

Avalon Belt Metamorphic Rocks, other SOvh Vaughn Hills Quartzite

MA

NH-ME Sequence Metamorphic Rocks, other Sp Paxton Fm

MA

NH-ME Sequence Calcgranofels Sp Paxton Fm

MA

NH-ME Sequence Metamorphic Rocks, other Sp Paxton Fm

MA

NH-ME Sequence Metamorphic Rocks, other Sp Paxton Fm

MA

NH-ME Sequence Metamorphic Rocks, other Sp Paxton Fm

MA

NH-ME Sequence Calcpelite Sp Paxton Fm

MA

Bronson Hill Sequence Mafic Rocks Spa Paxton Fm

MA

NH-ME Sequence Mafic Rocks Spa Paxton Fm

MA

NH-ME Sequence Sulfidic Schists Spqr Paxton Fm

MA

NH-ME Sequence Sulfidic Schists Spqr Paxton Fm

MA

NH-ME Sequence Sulfidic Schists Spsq Paxton Fm

MA

NH-ME Sequence Sulfidic Schists Spss Paxton Fm

MA

Avalon Belt Mafic Rocks Ssaqd

Straw Hollow Diorite and

Assabet Quartz Diorite

MA

Avalon Belt Mafic Rocks Ssqd Sharpners Pond Diorite

MA

NH-ME Sequence Metamorphic Rocks, other St Tower Hill Quartzite

MA

Avalon Belt Metamorphic Rocks, other St Tower Hill Quartzite

35

State Province Rock Group B Bedrock Unit Name/Description

MA

NH-ME Sequence Pelitic Rocks Sts Tower Hill Quartzite

MA

Avalon Belt Sulfidic Schists SZtb Tadmuck Brook Schist

MA

Mesozoic Basin Mesozoic Basin Sed. TRe

Red arkosic conglomerate,

sandstone, and siltstone

MA

Mesozoic Basin Mesozoic Basin Sed. Trn+Trs New Haven Arkose

MA

Eugeosyncline Sequence Ultramafic Rocks u Serpentinite and/or talc rock

MA

Avalon Belt Ultramafic Rocks u Serpentinite and/or talc rock

MA

Grenville Belt Mafic Rocks Yag

hornblende-biotite-plagioclase

gneiss and amphibolite

MA

Grenville Belt Mafic Rocks Yb

biotite-plagioclase-quartz

gneiss

MA

Grenville Belt Calcgranofels Ycs

Calc-silicate granofels and

gneiss

MA

Grenville Belt Grenville Granites Yfg

felsic biotite-microline-

plagioclase-quartz gneiss

MA

Grenville Belt Grenville Granites Ygg Granitoid gneiss

MA

Grenville Belt Mafic Rocks Yhb

Well-layered hornblende-biotite

gneiss

MA

Grenville Belt Mafic Rocks Yl Lee Gneiss

MA

Grenville Belt Grenville Granites Ysg Stamford granite Gneiss

MA

Grenville Belt Grenville Granites

(See Ysg, Yb, Ow, c-c, C-Zd)

Ysg+Yb+Ow+

C-c+C-Zd

MA

Grenville Belt Grenville Granites Ytg Tryingham Gneiss

MA

Grenville Belt Sulfidic Schists Yw Washingotn Gneiss

MA

Grenville Belt Pelitic Rocks Yw+Yb (See Yw and Yb)

MA

Grenville Belt Sulfidic Schists Ywb Washington Gneiss

MA

Grenville Belt Metamorphic Rocks, other Ywb+Ygg+Yw (See Ywb, Ygg, and Yw)

MA

Grenville Belt Carbonate Rocks Ywcs Washington Gneiss

MA

Grenville Belt Mafic Rocks Ywhg Washington Gneiss

MA

Avalon Belt Avalon Granite Zagr

Alaskite--mafic-poor gneissic

granite

MA

Avalon Belt Mafic Rocks Zb Blackstone Group

MA

Grenville Belt Mafic Rocks Zd Biotite-hornblende mafic dikes

MA

Avalon Belt Avalon Granite Zdgr Dedham Granite

MA

Bronson Hill Sequence Granite, other Zdh Dry Hill Gneiss

MA

Avalon Belt Avalon Granite Zdh+Zpmg+Zpd (See Zdh, Zpmg, Zpd)

MA

Bronson Hill Sequence Pelitic Rocks Zdhs Dry Hill Gneiss

MA

Avalon Belt Mafic Rocks Zdi Diorite--hornblende diorite

MA

Avalon Belt Mafic Rocks Zdigb Diorite and gabbro

MA

Avalon Belt Avalon Granite Zdngr Dedham Granite

MA

Bronson Hill Sequence Pelitic Rocks Zdpq

Dry Hill Gneiss; Pelham

Quartzite Mbr

MA

Avalon Belt Avalon Granite Zegr Esmond Granite

36

State Province Rock Group B Bedrock Unit Name/Description

MA

Avalon Belt Avalon Granite Zfgr

Granite of the Fall River

pluton

MA

Avalon Belt Mafic Rocks Zgb Gabbro

MA

Avalon Belt Avalon Granite Zgg Granite, gneiss, and schist

MA

Avalon Belt Unconsolidated Sed. Zgg Granite, gneiss, and schist

MA

Avalon Belt Avalon Granite Zgmgd Grant Mills Granodiorite

MA

Avalon Belt Pelitic Rocks Zgn

Biotite gneiss near New Bedford

feldspathic gneiss

MA

Avalon Belt Avalon Granite Zgr Biotite granite

MA

Avalon Belt Pelitic Rocks Zgs

Gneiss and schist near New

Bedford hornblende

MA

Avalon Belt Avalon Granite Zhg Hope Valley Alaskite Gneiss

MA

Avalon Belt Felsic Volcanics Zm Mattapan Volcanic Complex

MA

Avalon Belt Avalon Granite Zmgd Milford Granite

MA

Avalon Belt Avalon Granite Zmgr Milford Granite

MA

Bronson Hill Sequence Pelitic Rocks Zmm Mount Mineral Fm

MA

Bronson Hill Sequence Pelitic Rocks Zmmu Mount Mineral Fm

MA

Avalon Belt Metamorphic Rocks, other Zp Plainfield Fm

MA

Avalon Belt Avalon Granite Zpg Ponaganset Gneiss

MA

Avalon Belt Avalon Granite Zpgr Porphyritic granite

MA

Bronson Hill Sequence Basalt Zpm Poplar Mountain Gneiss

MA

Avalon Belt Mafic Rocks Zrdi Diorite at Rowley

MA

Avalon Belt Avalon Granite Zsg Scituate Granite Gneiss

MA

Avalon Belt Avalon Granite Zssy Sharon Syenite

MA

Avalon Belt Avalon Granite Ztgd Topsfield Granodiorite

MA

Avalon Belt Mafic Rocks Zv

Metamorphosed mafic to felsic

flow

MA

Avalon Belt Felsic Volcanics Zvf

Metamorphosed felsic

metavolcanic rocks

MA

Avalon Belt Pelitic Rocks Zw Westboro Fm

MA

Avalon Belt Avalon Granite Zwgr Westwood Granite

Maine

ME

NH-ME Sequence Granite, other C1 Biotite granite

ME

NH-ME Sequence Peraluminous Granite C1(m) Muscovite-biotite granite

ME

NH-ME Sequence Peraluminous Granite C1b(m) Biotite-muscovite granite

ME

NH-ME Sequence Alkali Granite C4a Alkali-feldspar quartz syenite

ME

Bronson Hill Sequence Mafic Rocks C6 Quartz diorite

ME

NH-ME Sequence Alkali Granite C7 Syenite

ME

Bronson Hill Sequence Mafic Rocks C9

Gabbro, diorite, or ultramafic

rocks

ME

NH-ME Sequence Mafic Rocks C9 Gabbro, diorite, or ultramafic

37

State Province Rock Group B Bedrock Unit Name/Description

rocks

ME

Bronson Hill Sequence Ultramafic Rocks C9c Ultramafic rocks

ME

Bronson Hill Sequence Pelitic Rocks C-clf Caucomgomoc Lake Fm

ME

Bronson Hill Sequence Basalt C-clg Caucomgomoc Lake Fm

ME

NH-ME Sequence Metamorphic Rocks, other CDs

Unnamed comglomerates and

sandstones

ME

Bronson Hill Sequence Pelitic Rocks C-gp Grand Pitch Fm

ME

Bronson Hill Sequence Pelitic Rocks C-h Hurricane Mtn Fm

ME

Bronson Hill Sequence Mafic Rocks C-ha Hurricane Mtn Fm

ME

Bronson Hill Sequence Mafic Rocks C-hmg Hurricane Mtn Fm

ME

Bronson Hill Sequence Mafic Rocks C-hpx Hurricane Mtn Fm

ME

Bronson Hill Sequence Metamorphic Rocks, other C-hq Hurricane Mtn Fm

ME

Bronson Hill Sequence Metamorphic Rocks, other C-hqw Hurricane Mtn Fm

ME

Bronson Hill Sequence Felsic Volcanics C-hr Hurricane Mtn Fm

ME

Bronson Hill Sequence Mafic Rocks C-j Jim Pond Fm

ME

Bronson Hill Sequence Pelitic Rocks C-jf Jim Pond Fm

ME

Bronson Hill Sequence Basalt C-jg Jim Pond Fm

ME

Bronson Hill Sequence Felsic Volcanics C-jk Jim Pond Fm

ME

Bronson Hill Sequence Pelitic Rocks C-jp Jim Pond Fm

ME

Bronson Hill Sequence Pelitic Rocks C-jq Jim Pond Fm

ME

Bronson Hill Sequence Pelitic Rocks C-ls Loon Stream Fm

ME

Bronson Hill Sequence Basalt C-uvm Unnamed mafic volcanic rocks

ME

NH-ME Sequence Granite, other D1 Granite

ME

Bronson Hill Sequence Granite, other D1 Granite

ME

Coastal Maine Granite, other D1 Granite

ME

NH-ME Sequence Granite, other D1(h) Granite

ME

Coastal Maine Granite, other D1(h) Granite

ME

NH-ME Sequence Granite, other D1(m) Muscovite-biotite granite

ME

Coastal Maine Granite, other D1(m) Muscovite-biotite granite

ME

Coastal Maine Granite, other D1(p)

Granite; pyroxene plus

hornblende inclusions

ME

NH-ME Sequence Granite, other D1(x) Porphyritic granite

ME

NH-ME Sequence Granite, other D1(y) Granite; granophyric inclusions

ME

NH-ME Sequence Granite, other D1(z) Granite; intrusive breccia

ME

Coastal Maine Granite, other D1(z) Granite; intrusive breccia

ME

NH-ME Sequence Granite, other D10(h)

Foid-bearing biotite-

hornblendesyenite

ME

NH-ME Sequence Granite, other D1-2 Biotite-hornblende granite

ME

NH-ME Sequence Granite, other D1-4c Granite to quartz monzonite

ME

NH-ME Sequence Mafic Rocks D1-6 Granite to quartz diorite

ME

NH-ME Sequence Granite, other D1a Alkali feldspar granite

38

State Province Rock Group B Bedrock Unit Name/Description

ME

Coastal Maine Granite, other D1a Alkali feldspar granite

ME

NH-ME Sequence Granite, other D1b Granite

ME

Bronson Hill Sequence Granite, other D1b Granite

ME

Coastal Maine Granite, other D1b Granite

ME

Coastal Maine Granite, other D1b(h) Granite

ME

Bronson Hill Sequence Granite, other D1b(m) Muscovite-biotite granite

ME

NH-ME Sequence Granite, other D1b(m) Muscovite-biotite granite

ME

NH-ME Sequence Granite, other D2 Granodiorite

ME

NH-ME Sequence Granite, other D2(h) Hornblende-biotite granodiorite

ME

Bronson Hill Sequence Granite, other D2(h) Hornblende-biotite granodiorite

ME

NH-ME Sequence Granite, other D2(m) Muscovite-biotite granodiorite

ME

NH-ME Sequence Granite, other D2-4b Granodiorite to quartz diorite

ME

NH-ME Sequence Granite, other D2-5

Granodiorite to quartz

monzodiorite

ME

NH-ME Sequence Mafic Rocks D2-D6 Granodiorite to quartz diorite

ME

NH-ME Sequence Granite, other D3 Tonalite

ME

NH-ME Sequence Granite, other D4c Quartz monzonite

ME

Coastal Maine Granite, other D4c Quartz monzonite

ME

NH-ME Sequence Granite, other D4c(h)

Quartz monzonite; hornblende

intrusions

ME

NH-ME Sequence Granite, other D4c(m)

Muscovite-biotite quartz

monzonite

ME

NH-ME Sequence Mafic Rocks D5-6

Quartz monzodiorite and

pyroxene-biotitequartz diorite

ME

Bronson Hill Sequence Mafic Rocks D5-6

Quartz monzodiorite and

pyroxene-biotitequartz diorite

ME

NH-ME Sequence Mafic Rocks D6(h)

Quartz diorite; hornblende

intrusions

ME

NH-ME Sequence Granite, other D7 Syenite

ME

Coastal Maine Granite, other D7 Syenite

ME

NH-ME Sequence Granite, other D7(p)

Syenite; pyroxene plus

hornblende intrusions

ME

NH-ME Sequence Mafic Rocks D7-8 Syenite to monzodiorite

ME

NH-ME Sequence Mafic Rocks D8 Monzodiorite

ME

Bronson Hill Sequence Mafic Rocks D9

Gabbro, diorite, and ultramafic

rocks

ME

NH-ME Sequence Mafic Rocks D9

Gabbro, diorite, and ultramafic

rocks

ME

Coastal Maine Mafic Rocks D9

Gabbro, diorite, and ultramafic

rocks

ME

NH-ME Sequence Mafic Rocks D9a Diorite

ME

NH-ME Sequence Mafic Rocks D9b Gabbro

ME

NH-ME Sequence Ultramafic Rocks D9b-c Gabbro to ultramafic rocks

ME

Coastal Maine Mafic Rocks D9-D6

Gabbro to ultramafic rocks;

quartz diorite

39

State Province Rock Group B Bedrock Unit Name/Description

ME

NH-ME Sequence Mafic Rocks D9-D6

Gabbro to ultramafic rocks;

quartz diorite

ME

Bronson Hill Sequence Mafic Rocks Db Beck Pond Limestone

ME

NH-ME Sequence Pelitic Rocks Dc Carrabassett Fm

ME

NH-ME Sequence Pelitic Rocks Dc? Carrabassett Fm

ME

NH-ME Sequence Pelitic Rocks Dch Chapman Sandstone

ME

NH-ME Sequence Pelitic Rocks Dcm

Carrabassett Fm: Massive pelite

member

ME

NH-ME Sequence Pelitic Rocks Dcq

Carrabassett Fm: Quartzite

member

ME

NH-ME Sequence Metamorphic Rocks, other Dcq

Carrabassett Fm: Quartzite

member

ME

NH-ME Sequence Pelitic Rocks Dcs

Carrabassett Fm: Thinly layered

member

ME

Bronson Hill Sequence Pelitic Rocks DC-us Unnamed sedimentary rocks

ME

Coastal Maine Basalt Deb Eastport Fm; basalt member

ME

NH-ME Sequence Mafic Rocks Deh Edmunds Hill Andesite

ME

Coastal Maine Mafic Rocks Dev

Eastport Fm; mafic to felsic

volcanic member

ME

NH-ME Sequence Calcpelite Dh Hildreths Formation

ME

NH-ME Sequence Metamorphic Rocks, other Dhb Hobbstown Formation

ME

Bronson Hill Sequence Metamorphic Rocks, other Dhb Hobbstown Formation

ME

NH-ME Sequence Mafic Rocks Dhd Hedgehog Fm

ME

NH-ME Sequence Felsic Volcanics Dhm Heald Mtn Rhyolite

ME

NH-ME Sequence Felsic Volcanics Dhmd Heald Mtn Rhyolite

ME

NH-ME Sequence Calcgranofels Dhr Hartin Fm.

ME

Bronson Hill Sequence Pelitic Rocks Dim Ironbound Mountain Formation

ME

NH-ME Sequence Pelitic Rocks Dl Littleton Formation

ME

NH-ME Sequence Metamorphic Rocks, other Dm Mapleton Fm.

ME

NH-ME Sequence Metamorphic Rocks, other Dmg Matagamon Sandstone

ME

NH-ME Sequence Calcgranofels DOb Bucksport Formation

ME

NH-ME Sequence Pelitic Rocks DOdg Digdeguash Fm.

ME

NH-ME Sequence Calcgranofels DOf Flume Ridge Fm.

ME

NH-ME Sequence Mafic Rocks DOs Spruce Top Greenstone

ME

Bronson Hill Sequence Pelitic Rocks DOup Unnamed pelite

ME

NH-ME Sequence Pelitic Rocks DOup Unnamed pelite

ME

NH-ME Sequence Mafic Rocks DOv

Undifferentiated mafic to

felsic volcanic rocks

ME

Coastal Maine Mafic Rocks DOv

Undifferentiated mafic to

felsic volcanic rocks

ME

Coastal Maine Mafic Rocks Dpb Perry Fm; basalt member

ME

NH-ME Sequence Calcgranofels Dpk Parker Bog Formation

40

State Province Rock Group B Bedrock Unit Name/Description

ME

Coastal Maine Metamorphic Rocks, other Dpss Perry Fm; sandstone member

ME

NH-ME Sequence Pelitic Rocks Ds Seboomook Formation

ME

Bronson Hill Sequence Pelitic Rocks Ds Seboomook Formation

ME

NH-ME Sequence Calcpelite DSas

Allagash Lake Fm; mixed

sedimentary rocks

ME

Bronson Hill Sequence Calcpelite DSas

Allagash Lake Fm; mixed

sedimentary rocks

ME

NH-ME Sequence Basalt DSav

Allagash Lake Fm; basalt and

mixed sedimentary rocks

ME

Bronson Hill Sequence Basalt DSav

Allagash Lake Fm; basalt and

mixed sedimentary rocks

ME

NH-ME Sequence Pelitic Rocks Dsb Swanback Fm.

ME

NH-ME Sequence Metamorphic Rocks, other DSbbc

Bell Brook Fm; conglomerate

member

ME

NH-ME Sequence Pelitic Rocks DSbbs Bell Brook Fm; pelite member

ME

Coastal Maine Pelitic Rocks DSbh Bar Harbor Fm.

ME

NH-ME Sequence Mafic Rocks Dsc

Seboomook Fm: Camera Hill

Greenstone

ME

Coastal Maine Felsic Volcanics DSca Castine Fm.

ME

Coastal Maine Pelitic Rocks DScd Calderwood Fm.

ME

NH-ME Sequence Metamorphic Rocks, other Dscg Unnamed conglomerate

ME

NH-ME Sequence Pelitic Rocks Dsd

Seboomook Fm: Day Mountain

Member

ME

NH-ME Sequence Metamorphic Rocks, other Dsdc

Seboomook Fm: Day Mountain

Member

ME

NH-ME Sequence Calcgranofels Dsdl

Seboomook Fm: Day Mountain

Member

ME

NH-ME Sequence Pelitic Rocks DSfh Fogelin Hill Fm.

ME

NH-ME Sequence Pelitic Rocks DSfp Frost Pond Shale

ME

NH-ME Sequence Calcpelite DSfrl Fish River Lake Fm.

ME

NH-ME Sequence Calcpelite DSm Madrid Formation

ME

NH-ME Sequence Metamorphic Rocks, other Dsm Madrid Formation

ME

NH-ME Sequence Calcgranofels DSm Madrid Formation

ME

NH-ME Sequence Granite, other DSmig

Undiff. sed. rks ext.

migmatization

ME

NH-ME Sequence Metamorphic Rocks, other Dsq Seboomook Fm; unnamed quartzite

ME

NH-ME Sequence Pelitic Rocks DSra

Rindgemere Formation: Upper

member

ME

NH-ME Sequence Calcgranofels DSrb

Rindgemere Formation: Lower

member

ME

NH-ME Sequence Calcgranofels DSrbl Rindgemere Fm: Lower member

ME

NH-ME Sequence Sulfidic Schists DSrbr Rindgemere Fm: Lower member

ME

NH-ME Sequence Calcpelite DSs

Spider Lake,Chandler Pond, and

Third Lake Formations

ME

NH-ME Sequence Sulfidic Schists Dst

Seboomook Fm: Temple Stream

Member

ME

NH-ME Sequence Metamorphic Rocks, other DStc Towow Fm: Conglomerate member

41

State Province Rock Group B Bedrock Unit Name/Description

ME

Coastal Maine Basalt DStf Thorofare Andesite

ME

Coastal Maine Metamorphic Rocks, other DSuc Unnamed conglomerate

ME

NH-ME Sequence Mafic Rocks Dsug

Seboomook Fm; unnamed mafic

greenstone

ME

NH-ME Sequence Pelitic Rocks Dsup Seboomook Fm; unnamed pelite

ME

NH-ME Sequence Pelitic Rocks DSus Unnamed sedimentary rocks

ME

Bronson Hill Sequence Pelitic Rocks DSuss Unnamed conglomeratic sandstone

ME

Coastal Maine Mafic Rocks DSuv Unnamed volcanic rocks

ME

NH-ME Sequence Mafic Rocks DSuv Unnamed volcanic rocks

ME

NH-ME Sequence Mafic Rocks DSv

Spider Lake and Chandler Pong

Formations

ME

Coastal Maine Felsic Volcanics DSvh Vinalhaven rhyolite

ME

NH-ME Sequence Pelitic Rocks Dt Tarratine Formation

ME

NH-ME Sequence Metamorphic Rocks, other Dtm Tarratine Fm: Misery Quartzite

ME

NH-ME Sequence Calcgranofels Dtmc

Tarratine Fm: McKenny Pond

Limestone

ME

NH-ME Sequence Pelitic Rocks Dto Tomhegan Formation

ME

NH-ME Sequence Felsic Volcanics Dtokc

Tomhegan Fm: Kineo Rhyolite

Member

ME

NH-ME Sequence Felsic Volcanics Dtokg

Tomhegan Fm: Kineo Rhyolite

Member

ME

NH-ME Sequence Felsic Volcanics Dtokm

Tomhegan Fm: Kineo Rhyolite

Member

ME

NH-ME Sequence Felsic Volcanics Dtrb

Traveler Rhyolite; Black Cat

Mbr.

ME

NH-ME Sequence Felsic Volcanics Dtrp Traveler Rhyolite; Pogy Mbr.

ME

NH-ME Sequence Metamorphic Rocks, other Dtv Trout Valley Fm.

ME

NH-ME Sequence Metamorphic Rocks, other Duc Unnamed conglomerate

ME

NH-ME Sequence Calcgranofels Dulc Unnamed limestone comglomerate

ME

NH-ME Sequence Pelitic Rocks Dup Unnamed pelite

ME

NH-ME Sequence Felsic Volcanics Durg Unnamed garnet rhyolite

ME

NH-ME Sequence Felsic Volcanics Dury Unnamed rhyolite

ME

NH-ME Sequence Pelitic Rocks Dus Unnamed sedimentary rocks

ME

NH-ME Sequence Pelitic Rocks Duss

Unnamed lithic sandstone and

conglomerate

ME

NH-ME Sequence Mafic Rocks Duvm Unnamed mafic volcanic rocks

ME

NH-ME Sequence Metamorphic Rocks, other Dw Whiskey Quartzite

ME

NH-ME Sequence Pelitic Rocks DZar Appleton Ridge Fm.

ME

NH-ME Sequence Pelitic Rocks DZg Gonic Formation

ME

NH-ME Sequence Alkali Granite J1 Granite

ME

NH-ME Sequence Mafic Rocks K(z)

Calcareous feldspathic

sandstone; intrusive breccia

ME

NH-ME Sequence Alkali Granite K1

Calcareous feldspathic

sandstone; granite

ME

NH-ME Sequence Alkali Granite K1a Alkali-feldspar granite

42

State Province Rock Group B Bedrock Unit Name/Description

ME

NH-ME Sequence Alkali Granite K1b Granite

ME

NH-ME Sequence Alkali Granite K4a Alkali-feldspar quartz syenite

ME

NH-ME Sequence Mafic Rocks K5 Quartz monzonite

ME

NH-ME Sequence Mafic Rocks K6-9

Quartz diorite and gabbro,

diorite, andultramafic rocks

ME

NH-ME Sequence Alkali Granite K7a Alkali-feldspar syenite

ME

NH-ME Sequence Mafic Rocks K8 Monzodiorite

ME

NH-ME Sequence Mafic Rocks K9

Gabbro, diorite, and ultramafic

rocks

ME

NH-ME Sequence Mafic Rocks Kv Mafic to felsic volcanic rocks

ME

NH-ME Sequence Alkali Granite Mz1(h) Hornblende-biotite granite

ME

NH-ME Sequence Alkali Granite Mz10 Foid-bearing syenite

ME

NH-ME Sequence Alkali Granite Mz7 Syenite

ME

NH-ME Sequence Alkali Granite Mz7a Alkali-feldspar syenite

ME

NH-ME Sequence Mafic Rocks Mz9

Gabbro, diorite, and ultramafic

rocks

ME

Bronson Hill Sequence Felsic Volcanics Mzv Mafic to felsic volcanic rocks

ME

NH-ME Sequence Felsic Volcanics Mzv Mafic to felsic volcanic rocks

ME

Bronson Hill Sequence Granite, other O1 Granite

ME

Bronson Hill Sequence Granite, other O1b Alkali-feldspar granite

ME

Bronson Hill Sequence Granite, other O1b-2

Alkali-feldspar granite

andgranodiorite

ME

Bronson Hill Sequence Granite, other O2 Granodiorite

ME

Bronson Hill Sequence Granite, other O4c(h)

Hornblende-biotite quartz

monzonite

ME

Bronson Hill Sequence Mafic Rocks O6(h)

Argillaceous limestone and/or

dolostone

ME

Bronson Hill Sequence Mafic Rocks O9

Gabbro, diorite, and ultramafic

rocks

ME

Bronson Hill Sequence Mafic Rocks Oam Ammonoosuc Volcanics

ME

Bronson Hill Sequence Sulfidic Schists Obb Blind Brook Fm.

ME

Coastal Maine Pelitic Rocks Obh Benner Hill Fm.

ME

Coastal Maine Sulfidic Schists Obhg Benner Hill fm;

ME

NH-ME Sequence Pelitic Rocks Obl Belle Lake Slate

ME

Bronson Hill Sequence Basalt Obp Bluffer Pond Fm.

ME

Bronson Hill Sequence Felsic Volcanics Obpr Bluffer Pond Fm;

ME

Coastal Maine Metamorphic Rocks, other OC-b Mount Battie Fm.

ME

Coastal Maine Sulfidic Schists OC-c Cookson Fm.

ME

Bronson Hill Sequence Mafic Rocks OC-cb Chase Brook Fm.

ME

Coastal Maine Sulfidic Schists OC-cqr Cookson Fm

ME

Coastal Maine Sulfidic Schists OC-cr Cookson Fm

ME

Coastal Maine Pelitic Rocks OC-css Cookson Fm

ME

Coastal Maine Mafic Rocks OC-cv Cookson Fm

43

State Province Rock Group B Bedrock Unit Name/Description

ME

Bronson Hill Sequence Pelitic Rocks OC-d Dead River Fm

ME

Bronson Hill Sequence Pelitic Rocks OC-dp Dead River Fm: Lower member

ME

Bronson Hill Sequence Pelitic Rocks OC-dq Dead River Fm: Upper member

ME

Bronson Hill Sequence Basalt OC-hm Hurd Mountain Fm.

ME

Bronson Hill Sequence Metamorphic Rocks, other Ocl Chase Lake Fm.

ME

Bronson Hill Sequence Metamorphic Rocks, other Oclc Chase Lake Fm

ME

Bronson Hill Sequence Pelitic Rocks Ocls Chase Lake Fm

ME

Coastal Maine Pelitic Rocks OC-me Megunticook Fm

ME

Coastal Maine Pelitic Rocks OC-me Megunticook Fm

ME

Coastal Maine Carbonate Rocks OC-mel Megunticook Fm

ME

Coastal Maine Sulfidic Schists OC-p Penobscot Fm

ME

Coastal Maine Basalt OC-pg Penobscot Fm

ME

Coastal Maine Sulfidic Schists OC-pmig Penobscot Fm

ME

Bronson Hill Sequence Pelitic Rocks Ocr Chandler Ridge Fm

ME

Bronson Hill Sequence Pelitic Rocks OC-s Sawmill Fm

ME

Bronson Hill Sequence Pelitic Rocks OC-sc Southeast Cove Fm

ME

Bronson Hill Sequence Pelitic Rocks OC-sd Saint Daniel Fm

ME

Bronson Hill Sequence Pelitic Rocks OC-us Unnamed sedimentary rocks

ME

NH-ME Sequence Pelitic Rocks OC-us Unnamed sedimentary rocks

ME

Bronson Hill Sequence Mafic Rocks OC-uv Unnamed volcanic rocks

ME

Bronson Hill Sequence Pelitic Rocks OC-z Aziscohos Formation

ME

Bronson Hill Sequence Pelitic Rocks Odmp Chandler Ridge Fm

ME

Bronson Hill Sequence Pelitic Rocks Odms Chandler Ridge Fm

ME

Bronson Hill Sequence Felsic Volcanics Odmv Chandler Ridge Fm

ME

Bronson Hill Sequence Mafic Rocks Odw Dry Wall volcanic rocks

ME

Bronson Hill Sequence Sulfidic Schists Ohh Holmes Hole Fm.

ME

Bronson Hill Sequence Felsic Volcanics Ok Kennebec Fm

ME

Bronson Hill Sequence Basalt Okmg Kamankeag Fm

ME

Bronson Hill Sequence Pelitic Rocks Okms Kamandeag Fm

ME

Bronson Hill Sequence Basalt Olm Lobster Mountain Vol. Complex

ME

Bronson Hill Sequence Mafic Rocks Olm Lobster Mountain Vol. Complex

ME

Bronson Hill Sequence Basalt Olma Lobster Mtn Vol.

ME

Bronson Hill Sequence Basalt Olmb Lobster Mtn Vol.

ME

Bronson Hill Sequence Pelitic Rocks Om Madawaska Lake Fm.

ME

Bronson Hill Sequence Felsic Volcanics Oml Munsungun Lake Fm.

ME

Bronson Hill Sequence Pelitic Rocks Opm Pile Mountain Argillite

ME

Bronson Hill Sequence Pelitic Rocks Oq Quimby Formation

ME

Bronson Hill Sequence Pelitic Rocks Oqg Quimby Fm

ME

Bronson Hill Sequence Pelitic Rocks Oqs Quimby Fm

ME

Bronson Hill Sequence Felsic Volcanics Oqv Quimby Fm

44

State Province Rock Group B Bedrock Unit Name/Description

ME

Bronson Hill Sequence Basalt Osb Shin Brook Fm

ME

NH-ME Sequence Pelitic Rocks Oup Unnamed pelite

ME

NH-ME Sequence Sulfidic Schists Our Unnamed sulfidic pelite

ME

NH-ME Sequence Pelitic Rocks Ous Unnamed sandstone and pelite

ME

Coastal Maine Pelitic Rocks Ous Unnamed sandstone and pelite

ME

Coastal Maine Pelitic Rocks Ouss Unnamed sandstone

ME

Coastal Maine Pelitic Rocks Oussp

Unnamed quartz sandstone and

pelite

ME

Bronson Hill Sequence Mafic Rocks Ouv Unnamed volcanic rocks

ME

NH-ME Sequence Mafic Rocks Ouv Unnamed volcanic rocks

ME

NH-ME Sequence Felsic Volcanics Ouvf Unnamed felsic volcanic rocks

ME

NH-ME Sequence Basalt Ouvm Unnamed mafic volcanic rocks

ME

Bronson Hill Sequence Basalt Ouvm Unnamed mafic volcanic rocks

ME

Coastal Maine Basalt Ouvm Unnamed mafic volcanic rocks

ME

Bronson Hill Sequence Mafic Rocks Ouvs

Unnamed volcanic and

sedimentary rocks

ME

Bronson Hill Sequence Mafic Rocks Ow Winterville Fm.

ME

Bronson Hill Sequence Metamorphic Rocks, other Owc Wassataquoik Chert

ME

Coastal Maine Mafic Rocks OZc Cushing Formation

ME

Coastal Maine Pelitic Rocks OZce Cape Elizabeth Fm

ME

Coastal Maine Metamorphic Rocks, other OZceq Cape Elizabeth Fm

ME

Coastal Maine Mafic Rocks OZcev Cape Elizabeth Fm

ME

Coastal Maine Mafic Rocks OZcf Columbia Falls Fm

ME

Coastal Maine Mafic Rocks OZcg Cushing Fm

ME

Coastal Maine Carbonate Rocks OZcl Cushing Fm

ME

Coastal Maine Metamorphic Rocks, other OZcq Cushing Fm

ME

Coastal Maine Sulfidic Schists OZcr Cushing Fm

ME

Coastal Maine Pelitic Rocks OZe Ellsworth Fm

ME

Coastal Maine Metamorphic Rocks, other OZef Ellsworth Fm

ME

Coastal Maine Mafic Rocks OZev Ellsworth Fm

ME

Coastal Maine Sulfidic Schists OZj Jewell Formation

ME

Coastal Maine Calcgranofels OZm Macworth Formation

ME

Coastal Maine Mafic Rocks OZpg Passagassawakeag block

ME

Coastal Maine Calcgranofels OZpgl Passagassawakeag block

ME

Coastal Maine Pelitic Rocks OZpgs Passagassawakeag block

ME

Coastal Maine Mafic Rocks OZs Spring Point Formation

ME

Coastal Maine Pelitic Rocks OZsc

Scarboro and Diamond Island

Formations

ME

Coastal Maine Carbonate Rocks OZsk Spurwink Limestone

ME

Coastal Maine Pelitic Rocks OZus Unnamed sedimentary rocks

ME

Bronson Hill Sequence Granite, other pC-c Gneisses: Chain Lakes Massif

ME

NH-ME Sequence Granite, other S1 Granite

45

State Province Rock Group B Bedrock Unit Name/Description

ME

Bronson Hill Sequence Granite, other S1 Granite

ME

NH-ME Sequence Mafic Rocks S9

Gabbro, diorite, and ultramafic

rocks

ME

Bronson Hill Sequence Mafic Rocks S9

Gabbro, diorite, and ultramafic

rocks

ME

Coastal Maine Mafic Rocks S9

Gabbro, diorite, and ultramafic

rocks

ME

Coastal Maine Ultramafic Rocks S9c

Gabbro, diorite, and ultramafic

rocks

ME

Coastal Maine Calcpelite Sak Ames Knob Fm

ME

NH-ME Sequence Pelitic Rocks Sbb Burnt Brook Fm

ME

NH-ME Sequence Pelitic Rocks Sc Capens Formation

ME

NH-ME Sequence Metamorphic Rocks, other Scgu Allsbury Fm

ME

Coastal Maine Basalt Sdb Dennys Fm

ME

Coastal Maine Mafic Rocks Sdv Dennys Fm

ME

Coastal Maine Mafic Rocks Se Edmunds Fm

ME

NH-ME Sequence Metamorphic Rocks, other Sf Frenchville Fm

ME

NH-ME Sequence Calcgranofels Sfm

Rocks of the Fivemile Brook

Sequence

ME

NH-ME Sequence Basalt Sfmg

Greenstone of the Fivemile

Brook Sequence

ME

NH-ME Sequence Calcgranofels Sg Greenvale Cove Formation

ME

Bronson Hill Sequence Calcgranofels Sg Greenvale Cove Formation

ME

Coastal Maine Pelitic Rocks Sh Hersey Fm

ME

Bronson Hill Sequence Calcpelite Shm Hardwood Mountain Formation

ME

NH-ME Sequence Calcpelite Shm Hardwood Mountain Formation

ME

NH-ME Sequence Pelitic Rocks Sj Jemtland Fm

ME

Coastal Maine Basalt Slb Leighton Fm

ME

Coastal Maine Mafic Rocks Slv Leighton Fm

ME

NH-ME Sequence Pelitic Rocks Smm Maple Mountain Fm

ME

NH-ME Sequence Calcgranofels Sns New Sweden Fm

ME

Coastal Maine Metamorphic Rocks, other So Oak Bay Fm

ME

NH-ME Sequence Pelitic Rocks SOar Aroostook River Fm

ME

NH-ME Sequence Calcpelite SOcm Carys Mill Fm

ME

NH-ME Sequence Pelitic Rocks SOcml Carys Mill Fm

ME

NH-ME Sequence Pelitic Rocks SOcms Carys Mill Fm

ME

NH-ME Sequence Mafic Rocks SOdb Dunn Brook Fm

ME

Bronson Hill Sequence Pelitic Rocks SOf Frontenac Formation

ME

Bronson Hill Sequence Basalt SOfc

Frontenac Fm: Canada Falls

Volcanic Mbr

ME

NH-ME Sequence Metamorphic Rocks, other SOlb Lobster Lake Fm

ME

NH-ME Sequence Pelitic Rocks SOm Mattawamkeag Fm

ME

NH-ME Sequence Metamorphic Rocks, other SOmh Mars Hill Conglomerate

ME

NH-ME Sequence Pelitic Rocks SOn Nine Lake Fm.

46

State Province Rock Group B Bedrock Unit Name/Description

ME

NH-ME Sequence Metamorphic Rocks, other SOuc Unnamed conglomerate

ME

NH-ME Sequence Pelitic Rocks SOup Unnamed pelite

ME

NH-ME Sequence Sulfidic Schists SOur Unnamed sulfidic pelite

ME

Bronson Hill Sequence Pelitic Rocks SOus Unnamed sedimentary rocks

ME

NH-ME Sequence Mafic Rocks SOuv Unnamed volcanic rocks

ME

NH-ME Sequence Calcpelite SOv Vassalboro Fm

ME

NH-ME Sequence Calcgranofels SOv Vassalboro Fm

ME

NH-ME Sequence Felsic Volcanics SOvv Vassalboro Fm

ME

NH-ME Sequence Pelitic Rocks Sp Perry Mountain Fm

ME

NH-ME Sequence Pelitic Rocks Spu Allsbury Fm

ME

Coastal Maine Pelitic Rocks Sqp Quoddy Fm

ME

Coastal Maine Mafic Rocks Sqv Quoddy Fm

ME

Coastal Maine Mafic Rocks Sqvu Quoddy Fm

ME

NH-ME Sequence Pelitic Rocks Sr Rangeley Fm

ME

NH-ME Sequence Pelitic Rocks Sra Rangely Fm: 'A' member

ME

NH-ME Sequence Metamorphic Rocks, other Srac Rangely Fm: 'A' member

ME

NH-ME Sequence Pelitic Rocks Srb Rangely Fm: 'B' member

ME

NH-ME Sequence Pelitic Rocks Src Rangely Fm: 'C' member

ME

NH-ME Sequence Felsic Volcanics Srm Rocky Mountain quartz latite

ME

NH-ME Sequence Calcgranofels Srp Ripogenus Fm

ME

NH-ME Sequence Calcpelite Ss Sangerville Fm

ME

NH-ME Sequence Calcgranofels Ss Sangerville Fm

ME

NH-ME Sequence Pelitic Rocks Ssa Sangerville Fm

ME

NH-ME Sequence Calcgranofels Ssal Sangerville Fm

ME

NH-ME Sequence Sulfidic Schists Ssar Sangerville Fm

ME

NH-ME Sequence Metamorphic Rocks, other Ssc Sangerville Fm

ME

NH-ME Sequence Sulfidic Schists Ssf Smalls Falls Fm

ME

NH-ME Sequence Sulfidic Schists Ssf? Smalls Falls Fm

ME

NH-ME Sequence Calcgranofels Ssl Sangerville Fm

ME

NH-ME Sequence Pelitic Rocks Ssm Smyrna Mills Fm

ME

NH-ME Sequence Calcgranofels Sspm

Sangerville Fm; Patch Mountain

Member

ME

NH-ME Sequence Calcgranofels Sspr Spragueville Fm

ME

NH-ME Sequence Sulfidic Schists Ssr Sangerville Fm

ME

NH-ME Sequence Pelitic Rocks Ssu Allsbury Fm

ME

NH-ME Sequence Calcpelite Stf The Forks Fm

ME

NH-ME Sequence Calcgranofels Stf The Forks Fm

ME

NH-ME Sequence Metamorphic Rocks, other Suc Unnamed conglomerate

ME

Bronson Hill Sequence Metamorphic Rocks, other Suc Unnamed conglomerate

ME

NH-ME Sequence Metamorphic Rocks, other Sucs Unnamed conglomeratic sandstone

47

State Province Rock Group B Bedrock Unit Name/Description

ME

NH-ME Sequence Calcgranofels Sul Unnamed limestone

ME

Bronson Hill Sequence Calcgranofels Sul Unnamed limestone

ME

NH-ME Sequence Sulfidic Schists Sur Unnamed sulfidic pelite

ME

NH-ME Sequence Calcgranofels Sus Unnamed sedimentary rocks

ME

NH-ME Sequence Metamorphic Rocks, other Suss Unnamed sandstone

ME

NH-ME Sequence Basalt Suvm Unnamed mafic volcanic rocks

ME

NH-ME Sequence Mafic Rocks Suvs

Unnamed volcanic and

sedimentary rocks

ME

NH-ME Sequence Pelitic Rocks Sw Waterville Fm

ME

NH-ME Sequence Mafic Rocks Swb West Branch volcanic rocks

ME

NH-ME Sequence Calcgranofels Swl Waterville Fm

ME

NH-ME Sequence Ultramafic Rocks SZ9c

Ultramafic rocks, fold-bearing

syenite

ME

NH-ME Sequence Calcgranofels SZb Berwick Formation

ME

NH-ME Sequence Calcgranofels SZe Eliot Formation

ME

NH-ME Sequence Calcgranofels SZk Kittery Formation

ME

Coastal Maine Carbonate Rocks Zcb Coombs Limestone

ME

Coastal Maine Pelitic Rocks Zi Rocks of Islesboro

ME

Coastal Maine Carbonate Rocks Zil Rocks of Islesboro; limestone

ME

Coastal Maine Mafic Rocks Znh North Haven Fm

ME

Coastal Maine Mafic Rocks Znh North Haven Fm

ME

Coastal Maine Pelitic Rocks Zop Ogier Point Fm

ME

NH-ME Sequence Pelitic Rocks Zr Rye Fm

ME

Coastal Maine Metamorphic Rocks, other Zrk Rockport Fm

New Hampshire

NH

Bronson Hill Sequence Pelitic Rocks C-h Hurricane Mtn. Fm

NH

Bronson Hill Sequence Mafic Rocks C-jb Jim Pond Fm

NH

Bronson Hill Sequence Granite, other D1b

Pink equigranular biotite

granite

NH

Waits River-Gile Mtn. Granite, other D1b

Pink equigranular biotite

granite

NH

NH-ME Sequence Granite, other D1b

Pink equigranular biotite

granite

NH

Bronson Hill Sequence Peraluminous Granite D1m

Two-mica granite of northern

and southeastern NH

NH

NH-ME Sequence Peraluminous Granite D1m

Two-mica granite of northern

and southeastern NH

NH

Bronson Hill Sequence Granite, other D2b

Porphyritic biotitie

granodiorite

NH

Bronson Hill Sequence Granite, other D3Ab Biotite tonalite

NH

NH-ME Sequence Granite, other D3Ab Biotite tonalite

NH

NH-ME Sequence Granite, other D3Bb

Biotite trondhjemite in Rumney

Quadrangle

48

State Province Rock Group B Bedrock Unit Name/Description

NH

Bronson Hill Sequence Mafic Rocks D6

Biotite quartz diorite in

northeastern NH

NH

NH-ME Sequence Mafic Rocks D6

Biotite quartz diorite in

northeastern NH

NH

Bronson Hill Sequence Granite, other Db2b Bethlehem Granodiorite

NH

NH-ME Sequence Granite, other Db2b Bethlehem Granodiorite

NH

NH-ME Sequence Peraluminous Granite Dc1m Concord Granite

NH

Bronson Hill Sequence Peraluminous Granite Dc1m Concord Granite

NH

NH-ME Sequence Granite, other Dc3Am Two-mica tonalite

NH

NH-ME Sequence Mafic Rocks De9 Exeter Diorite

NH

Waits River-Gile Mtn. Pelitic Rocks Dg Gile Mountain Fm

NH

Waits River-Gile Mtn. Pelitic Rocks Dg Gile Mountain Fm

NH

Waits River-Gile Mtn. Calcgranofels Dgc Gile Mountain Fm

NH

Waits River-Gile Mtn. Pelitic Rocks Dgm Gile Mountain Fm

NH

Waits River-Gile Mtn. Mafic Rocks Dgv Gile Mountain Fm

NH

Waits River-Gile Mtn. Pelitic Rocks Di Ironbound Mtn Fm

NH

Bronson Hill Sequence Pelitic Rocks Di Ironbound Mtn Fm

NH

NH-ME Sequence Pelitic Rocks Di Ironbound Mtn Fm

NH

Bronson Hill Sequence Mafic Rocks Dib Ironbound Mtn Fm

NH

Bronson Hill Sequence Sulfidic Schists Die Ironbound Mtn Fm

NH

Bronson Hill Sequence Felsic Volcanics Dif Ironbound Mtn Fm

NH

Waits River-Gile Mtn. Felsic Volcanics Dih

Ironbound Mt Fm; Grits at Halls

Stream in northern NH

NH

Bronson Hill Sequence Felsic Volcanics Dir Ironbound Mtn Fm

NH

NH-ME Sequence Granite, other Dk2x NH PS: Kinsman Granodiorite

NH

Bronson Hill Sequence Granite, other Dk2x NH PS: Kinsman Granodiorite

NH

Bronson Hill Sequence Pelitic Rocks Dl Littleton Fm

NH

NH-ME Sequence Pelitic Rocks Dl Littleton Fm

NH

Bronson Hill Sequence Pelitic Rocks Dl Littleton Fm

NH

Bronson Hill Sequence Pelitic Rocks Dl Littleton Fm

NH

Bronson Hill Sequence Metamorphic Rocks, other Dl+Sc (See Dl and Sc descriptions)

NH

NH-ME Sequence Calcgranofels Dlc Littleton Fm

NH

NH-ME Sequence Metamorphic Rocks, other Dlcs Littleton Fm

NH

NH-ME Sequence Pelitic Rocks Dll Littleton Fm

NH

NH-ME Sequence Pelitic Rocks Dlu Littleton Fm

NH

Bronson Hill Sequence Mafic Rocks Dlv Littleton Fm

NH

NH-ME Sequence Mafic Rocks Dlvb Littleton Fm

NH

Bronson Hill Sequence Mafic Rocks Dlvs Littleton Fm

NH

NH-ME Sequence Mafic Rocks Dlvs Littleton Fm

49

State Province Rock Group B Bedrock Unit Name/Description

NH

NH-ME Sequence Mafic Rocks Ds1-6 Spaulding Tonalite

NH

NH-ME Sequence Granite, other Ds1-6 Spaulding Tonalite

NH

NH-ME Sequence Granite, other Ds1-6+Dc1m

(See Ds1-6 and Dc1m

descriptions)

NH

NH-ME Sequence Mafic Rocks Ds6-9B

Hypersthene-biotite quartz

diorite

NH

Bronson Hill Sequence Mafic Rocks DS9

Metamorphosed gabbro, diorite,

andintrusive basalt dikes

NH

Bronson Hill Sequence Mafic Rocks DS9

Metamorphosed gabbro, diorite,

andintrusive basalt dikes

NH

NH-ME Sequence Granite, other DSlr Migmatitic rocks

NH

NH-ME Sequence Granite, other Dw3A Winnipesaukee Tonalite

NH

Bronson Hill Sequence Alkali Granite J1-4l

Leuocratic granite to quartz

syenite

NH

Bronson Hill Sequence Felsic Volcanics J1a Mount Osceola Granite

NH

Bronson Hill Sequence Alkali Granite J1h Hastingsite granite

NH

NH-ME Sequence Alkali Granite J1h Hastingsite granite

NH

Bronson Hill Sequence Alkali Granite J1hx Granite porphyry

NH

NH-ME Sequence Alkali Granite J1hx Granite porphyry

NH

NH-ME Sequence Alkali Granite J1O

Nepheline-sodalite-hastingsite

syenite

NH

Bronson Hill Sequence Alkali Granite J1r Mesoperthitic granite

NH

NH-ME Sequence Alkali Granite J1r Mesoperthitic granite

NH

NH-ME Sequence Alkali Granite J1x Porphyritic granite

NH

Waits River-Gile Mtn. Alkali Granite J4h

Hornblende or alkalic

amphibolequartz syenite

NH

Bronson Hill Sequence Alkali Granite J4h

Hornblende or alkalic

amphibolequartz syenite

NH

NH-ME Sequence Alkali Granite J4h

Hornblende or alkalic

amphibolequartz syenite

NH

NH-ME Sequence Alkali Granite J4hx

Porphyritic hornblende or

alkalicamphibole quartz syenite

NH

NH-ME Sequence Alkali Granite J4x Quartz syenite

NH

Bronson Hill Sequence Mafic Rocks J5

Hornblende-biotite

quartzmonzodiorite

NH

NH-ME Sequence Mafic Rocks J5

Hornblende-biotite

quartzmonzodiorite

NH

Waits River-Gile Mtn. Alkali Granite J7h

Hornblende (or alkalic

amphibole)syenite

NH

Bronson Hill Sequence Alkali Granite J7h

Hornblende (or alkalic

amphibole)syenite

NH

NH-ME Sequence Alkali Granite J7h

Hornblende (or alkalic

amphibole)syenite

NH

NH-ME Sequence Alkali Granite J7x Porphyritic syenite

NH

NH-ME Sequence Mafic Rocks J8 Augite monzodiorite

NH

NH-ME Sequence Mafic Rocks J9A Diorite

NH

Waits River-Gile Mtn. Mafic Rocks J9Ah Porphyritic hornblende diorite

50

State Province Rock Group B Bedrock Unit Name/Description

NH

NH-ME Sequence Mafic Rocks J9B Gabbro

NH

Bronson Hill Sequence Alkali Granite Jc1b

Conway Granite--mesoperthic

biotitegranite

NH

NH-ME Sequence Alkali Granite Jc1b

Conway Granite--mesoperthic

biotitegranite

NH

NH-ME Sequence Felsic Volcanics Jmv Moat Volcanics

NH

NH-ME Sequence Alkali Granite Jo1b Mount Osceola Granite

NH

NH-ME Sequence Alkali Granite Jo1h Mount Osceola Granite

NH

NH-ME Sequence Felsic Volcanics K1a

Rhyolite and fine-grained

granite

NH

NH-ME Sequence Alkali Granite K1bx Porphyritic biotite granite

NH

NH-ME Sequence Alkali Granite K1r

Mesoperthitic granite,

withriebeckite and(or)

hastingsite

NH

NH-ME Sequence Alkali Granite K2 Biotite-hornblende granodiorite

NH

NH-ME Sequence Alkali Granite K4x

Large mesoperthitic phenocrysts

inquartz syenite of "Albany

type"

NH

NH-ME Sequence Alkali Granite K7C

Augite-hornblende-biotite

monzonite

NH

NH-ME Sequence Mafic Rocks K9A Hornblende diorite

NH

NH-ME Sequence Mafic Rocks K9AB

Augite hornblende diorite and

gabbro

NH

NH-ME Sequence Mafic Rocks K9B

Augite-hornblende-biotite

gabbro

NH

NH-ME Sequence Alkali Granite Kc1b Mesoperthic biotite granite

NH

NH-ME Sequence Mafic Rocks Kv

Basalt, minor rhyolite

ignimbriteand andesitic tuff

NH

Bronson Hill Sequence Peraluminous Granite MD1m Two-mica granite

NH

NH-ME Sequence Peraluminous Granite MD3B

Trondhjemite and abundant

pegmatite

NH

Bronson Hill Sequence Mafic Rocks Oal Ammonoosuc Volcanics

NH

Bronson Hill Sequence Mafic Rocks Oalb Ammonoosuc Volcanics

NH

Bronson Hill Sequence Pelitic Rocks Oalg Ammonoosuc Volcanics

NH

Bronson Hill Sequence Pelitic Rocks Oali Ammonoosuc Volcanics

NH

Bronson Hill Sequence Pelitic Rocks Oals Ammonoosuc Volcanics

NH

Bronson Hill Sequence Mafic Rocks Oalx Ammonoosuc Volcanics

NH

Bronson Hill Sequence Mafic Rocks Oalx+O-Cd

(See Oalx and O-Cd

descriptions)

NH

Bronson Hill Sequence Pelitic Rocks Oaus Amoonoosuc Volcanics

NH

Bronson Hill Sequence Mafic Rocks Oaux Amoonoosuc Volcancs

NH

Bronson Hill Sequence Granite, other Oc1b

Biotite granite (Cambridge

Black pluton)

NH

Bronson Hill Sequence Granite, other Oc3Ah Hornblende-biotite tonalite

NH

Bronson Hill Sequence Granite, other Oc3Ax

Porphyritic phase of

hornblende-biotite tonalite

NH

Bronson Hill Sequence Mafic Rocks Oc9B Gabbro and diabase

51

State Province Rock Group B Bedrock Unit Name/Description

NH

Bronson Hill Sequence Pelitic Rocks O-Cd Dead River Fm

NH

Bronson Hill Sequence Pelitic Rocks O-Cdp Dead River Fm

NH

Bronson Hill Sequence Pelitic Rocks O-Czl Aziscohos Fm

NH

Bronson Hill Sequence Pelitic Rocks O-Czu Aziscohos Fm

NH

Bronson Hill Sequence Granite, other Oh2-9a Highlandcroft Plutonic Suite

NH

Bronson Hill Sequence Granite, other Oh2h Highlandcroft Plutonic Suite

NH

Bronson Hill Sequence Granite, other Oj3A Tonalite

NH

Bronson Hill Sequence Granite, other Oo1-3A

granite, granodiorite, and

tonalite

NH

Bronson Hill Sequence Granite, other Oo1-3B

granite, granodiorite, and

trondhjemite

NH

Bronson Hill Sequence Granite, other Oo1b Biotite granite

NH

Bronson Hill Sequence Granite, other Oo1bx

Porphyritic (alkalic

feldspar)biotite granite

NH

Bronson Hill Sequence Granite, other Oo1h hornblende-biotite granite

NH

Bronson Hill Sequence Granite, other Oo2-3A Granodiorite to tonalite

NH

Bronson Hill Sequence Granite, other Oo2b Biotite granodiorite

NH

Bronson Hill Sequence Granite, other Oo2bx

Porphyritic biotite

granodioritein no. Jefferson

dome

NH

Bronson Hill Sequence Granite, other Oo2h Hornblende granodiorite

NH

Bronson Hill Sequence Granite, other Oo3B Trondhjemite

NH

Bronson Hill Sequence Granite, other Oo3B-6

Trondhjemite and quartz diorite

inno. Jefferson dome

NH

Bronson Hill Sequence Granite, other Oo4-7h

Hornblende-biotite quartz

syenite to syenite

NH

Bronson Hill Sequence Granite, other Oo4Ch Hornblende quartz monzonite

NH

Bronson Hill Sequence Mafic Rocks Oo9B Hornblende gabbro

NH

Bronson Hill Sequence Sulfidic Schists Op Partridge Fm

NH

Bronson Hill Sequence Mafic Rocks Opv Partridge Fm

NH

Bronson Hill Sequence Mafic Rocks Opvi Partridge Fm

NH

Bronson Hill Sequence Sulfidic Schists Oq Quimby Fm

NH

NH-ME Sequence Granite, other OZrb

Rye Complex: Breakfast Hill

Granite

NH

NH-ME Sequence Pelitic Rocks OZrz Rye Complex

NH

NH-ME Sequence Peraluminous Granite P1m Gray biotite granite

NH

NH-ME Sequence Peraluminous Granite PM1m

Two-mica granite of the

Sebagobatholith and Effingham

pluton

NH

Bronson Hill Sequence Granite, other S1b Biotite granite stock and dikes

NH

NH-ME Sequence Granite, other Sa2x Ayer Granodiorite

NH

Bronson Hill Sequence Metamorphic Rocks, other Sc Clough Quartzite

52

State Province Rock Group B Bedrock Unit Name/Description

NH

Bronson Hill Sequence Calcpelite Sf Fitch Fm

NH

NH-ME Sequence Calcpelite Sf Fitch Fm

NH

Bronson Hill Sequence Metamorphic Rocks, other Sfc Fitch and Clough Fm

NH

Bronson Hill Sequence Metamorphic Rocks, other Sfc+Db2b (See Sfc and Db2b descriptions)

NH

Bronson Hill Sequence Pelitic Rocks Sfr Frontenac Fm

NH

Waits River-Gile Mtn. Pelitic Rocks Sfr Frontenac Fm

NH

Bronson Hill Sequence Mafic Rocks Sfrb Frontenac Fm

NH

NH-ME Sequence Mafic Rocks Sfrb Frontenac Fm

NH

Waits River-Gile Mtn. Mafic Rocks Sfrb Frontenac Fm

NH

Waits River-Gile Mtn. Calcgranofels Sfrc Frontenac Fm

NH

Waits River-Gile Mtn. Pelitic Rocks Sfrg Frontenac Fm

NH

Bronson Hill Sequence Mafic Rocks Sfrv Frontenac Fm

NH

Bronson Hill Sequence Mafic Rocks Sfrx Frontenac Fm

NH

Bronson Hill Sequence Metamorphic Rocks, other Sg Greenvale Cove Fm

NH

NH-ME Sequence Calcgranofels Sm Madrid Fm

NH

NH-ME Sequence Sulfidic Schists Smsf Madrid and Smalls Falls Fms

NH

Bronson Hill Sequence Sulfidic Schists Smsf Madrid and Smalls Falls Fms

NH

NH-ME Sequence Sulfidic Schists Smsf Madrid and Smalls Falls Fms

NH

NH-ME Sequence Granite, other Sn1x NH PS: Newburyport Complex

NH

NH-ME Sequence Granite, other Sn2-3A NH PS: Newburyport Complex

NH

NH-ME Sequence Calcgranofels SOb Berwick Fm

NH

NH-ME Sequence Calcpelite SObc Berwick Fm

NH

NH-ME Sequence Calcgranofels SObc Berwick Fm

NH

NH-ME Sequence Pelitic Rocks SObg Berwick Fm

NH

NH-ME Sequence Calcgranofels SOe Eliot Fm

NH

NH-ME Sequence Sulfidic Schists SOec Eliot Fm

NH

NH-ME Sequence Calcgranofels SOk Kittery Fm

NH

Bronson Hill Sequence Pelitic Rocks Sp Perry Mtn Fm

NH

NH-ME Sequence Pelitic Rocks Sp Perry Mtn Fm

NH

NH-ME Sequence Sulfidic Schists Spr Perry Mtn and Rangely Fms

NH

Bronson Hill Sequence Sulfidic Schists Spr Perry Mtn and Rangely Fms

NH

Bronson Hill Sequence Mafic Rocks Spvs Perry Mtn Fm

NH

Bronson Hill Sequence Mafic Rocks Spvs Perry Mtn Fm

NH

Bronson Hill Sequence Pelitic Rocks Sr Rangely Fm

NH

NH-ME Sequence Pelitic Rocks Sr Rangely Fm

NH

NH-ME Sequence Pelitic Rocks Src Rangely Fm

NH

Bronson Hill Sequence Pelitic Rocks Src Rangely Fm

NH

NH-ME Sequence Pelitic Rocks Srl Rangely Fm: Lower part

NH

Bronson Hill Sequence Pelitic Rocks Srl Rangely Fm: Lower part

NH

NH-ME Sequence Calcgranofels Srlp Rangely Fm

53

State Province Rock Group B Bedrock Unit Name/Description

NH

Bronson Hill Sequence Sulfidic Schists Sru Rangely Fm: Upper part

NH

NH-ME Sequence Sulfidic Schists Sru Rangely Fm: Upper part

NH

NH-ME Sequence Calcgranofels Srup Rangely Fm

NH

NH-ME Sequence Felsic Volcanics Srvf Rangely Fm

NH

Bronson Hill Sequence Sulfidic Schists Ssf Smalls Falls Fm

NH

NH-ME Sequence Sulfidic Schists Ssf Smalls Falls Fm

NH

Bronson Hill Sequence Sulfidic Schists Ssf Smalls Falls Fm

NH

Bronson Hill Sequence Mafic Rocks Ssfb Smalls Falls Fm

NH

Bronson Hill Sequence Mafic Rocks Ssfc Smalls Falls Fm

NH

Bronson Hill Sequence Pelitic Rocks Ssff Smalls Falls Fm

NH

Bronson Hill Sequence Felsic Volcanics Ssfx Smalls Falls Fm

NH

NH-ME Sequence Granite, other Zmz Massabesic Gneiss Complex

Rhode Island

RI

Avalon Belt Pelitic Rocks Cpc+OCcj

Pirates Cove Fm. & Jamestwon

Fm.

RI

Avalon Belt Granite, other Dsa Scituate Igneous Suite

RI

Avalon Belt Mafic Rocks Dsd Scituate Igneous Suite

RI

Avalon Belt Granite, other Dsfg Scituate Igneous Suite

RI

Avalon Belt Granite, other Dsg Scituate Igneous Suite

RI

Avalon Belt Granite, other Dsgd Scituate Igneous Suite

RI

Avalon Belt Granite, other Dsm Scituate Igneous Suite

RI

Avalon Belt Felsic Volcanics Dsr Scituate Igneous Suite

RI

Avalon Belt Felsic Volcanics Dsv Scituate Igneous Suite

RI

Avalon Belt Ultramafic Rocks DZc Cumberlandite

RI

Avalon Belt Mafic Rocks DZgd gabbro/diorite

RI

Avalon Belt Mafic Rocks Jm monchiquite

RI

Avalon Belt Unconsolidated Sed. Kr Raritan Fm

RI

Avalon Belt Peraluminous Granite MDca

alkali-feldspar granite of

Cumberland

RI

Avalon Belt Pelitic Rocks OC-cdi

Conanicut Grp: Dutch Island

Harbor Fm

RI

Avalon Belt Pelitic Rocks OC-cep Conanicut Grp: East Passage Fm

RI

Avalon Belt Pelitic Rocks OC-cfb Conanicut Grp: Fort Burnside Fm

RI

Avalon Belt Pelitic Rocks OC-cj Conanicut Grp: Jamestown Fm

RI

Avalon Belt Pelitic Rocks OC-cj+OC-cfb Conanicut Grp: Jamestown Fm

RI

Avalon Belt Pelitic Rocks OC-cu Conanicut Grp; undifferentiated

RI

Avalon Belt Ultramafic Rocks OC-m Minette

RI

Narragansett Basin Narragansett Basin Sed. Pnbd Narragansett Bay Grp

RI

Narragansett Basin Narragansett Basin Sed. Pnbpo Narragansett Bay Grp

RI

Narragansett Basin Narragansett Basin Sed. Pnbpu Narragansett Bay Grp

54

State Province Rock Group B Bedrock Unit Name/Description

RI

Narragansett Basin Narragansett Basin Sed. Pnbr Narragansett Bay Grp

RI

Narragansett Basin Narragansett Basin Sed. Pnbs Narragansett Bay Grp

RI

Narragansett Basin Narragansett Basin Sed. Pnbw Narragansett Bay Grp

RI

Avalon Belt Peraluminous Granite Pnfg Narr. Pier Plut. Ste

RI

Avalon Belt Peraluminous Granite Png Narr. Pier Plut. Ste

RI

Avalon Belt Peraluminous Granite Pnlg Narr. Pier Plut. Ste

RI

Avalon Belt Peraluminous Granite Pnpg Narr. Pier Plut. Ste

RI

Narragansett Basin Narragansett Basin Sed. PZmc Metaclastic rock, undivided

RI

Avalon Belt Unconsolidated Sed. Qal Quaternary sediments

RI

Avalon Belt Mafic Rocks Td Diabase

RI

Avalon Belt Metamorphic Rocks, other Tvq Vein quartz

RI

Avalon Belt Mafic Rocks Zbm Blackstone Grp

RI

Avalon Belt Mafic Rocks Zbm Blackstone Grp

RI

Avalon Belt Metamorphic Rocks, other Zbq Blackstone Grp

RI

Avalon Belt Calcpelite Zbs Blackstone Grp

RI

Avalon Belt Calcgranofels Zbs Blackstone Grp

RI

Avalon Belt Mafic Rocks Zbu Blackstone Grp

RI

Narragansett Basin Mafic Rocks Zbu Blackstone Grp

RI

Avalon Belt Avalon Granite Zeag Esmond Igneous Suite

RI

Avalon Belt Avalon Granite Zefg Esmond Igneous Suite

RI

Avalon Belt Avalon Granite Zefv Esmond Igneous Suite

RI

Avalon Belt Avalon Granite Zeg Esmond Igneous Suite

RI

Avalon Belt Avalon Granite Zegd Esmond Igneous Suite

RI

Avalon Belt Avalon Granite Zegg Esmond Igneous Suite

RI

Avalon Belt Mafic Rocks Zem Esmond Igneous Suite

RI

Avalon Belt Avalon Granite Zha Harmony Grp: Absalona Fm

RI

Avalon Belt Avalon Granite Zhn Harmony Grp: Nipsachuck Fm

RI

Avalon Belt Felsic Volcanics Zhw Harmony Grp: Woonasquatucket Fm

RI

Avalon Belt Calcgranofels Zms mica schist

RI

Avalon Belt Calcgranofels Znfa Newport Grp: Fort Adams Fm

RI

Avalon Belt Pelitic Rocks Znnn Newport Grp: Newport Neck Fm

RI

Avalon Belt Pelitic Rocks Znpn Newport Grp: Price Neck Fm

RI

Avalon Belt Metamorphic Rocks, other Zp Plainfield Fm

RI

Avalon Belt Avalon Granite Zsag Sterling Plutonic Grp

RI

Avalon Belt Avalon Granite Zseg Granites of SE RI

RI

Avalon Belt Avalon Granite Zsepg Granites of SE RI

RI

Avalon Belt Avalon Granite Zsgg Sterling Plutonic Grp

RI

Avalon Belt Mafic Rocks Zsmg Sterling Plutonic Grp

RI

Avalon Belt Mafic Rocks Zwm Waterford Gr: Mamacoke Fm

RI

Avalon Belt Avalon Granite Zwr Waterford Grp: Rope Ferry

55

State Province Rock Group B Bedrock Unit Name/Description

Gneiss

Vermont

VT

Grenville Shelf Sequence Carbonate Rocks C-bh Bridgeman Hill Fm.

VT

Eugeosyncline Sequence Pelitic Rocks C-br Breeze Fm

VT

Eugeosyncline Sequence Pelitic Rocks C-brc Breeze Fm

VT

Grenville Shelf Sequence Pelitic Rocks C-c Chesire Quartzite

VT

Grenville Belt Metamorphic Rocks, other C-cg Bull Hill Gniess

VT

Grenville Belt Carbonate Rocks C-cm Cavendish Fm

VT

Grenville Belt Carbonate Rocks C-cm Cavendish Fm

VT

Grenville Belt Pelitic Rocks C-cr Cavendish Fm, Readsboro Mbr.

VT

Grenville Shelf Sequence Carbonate Rocks C-cs

Clarendon Springs, Ticonderoga,

and Rock River dolomites

VT

Grenville Shelf Sequence Carbonate Rocks C-cs+C-w (See C-cs amd C-w)

VT

Grenville Shelf Sequence Carbonate Rocks C-d Dunham dolomite

VT

Grenville Shelf Sequence Pelitic Rocks C-da Danby and Potsdam formations

VT

Grenville Belt Pelitic Rocks C-dt Dalton Fm

VT

Grenville Shelf Sequence Carbonate Rocks C-f Forestdale marble

VT

Eugeosyncline Sequence Pelitic Rocks C-h Hazens Notch Fm

VT

Eugeosyncline Sequence Mafic Rocks C-hb

Hazens Notch Fm; Belvidere Mtn.

amphibolite member

VT

Eugeosyncline Sequence Mafic Rocks C-hg Hazens Notch Fm

VT

Eugeosyncline Sequence Pelitic Rocks C-hm Hazens Notch Fm

VT

Grenville Belt Pelitic Rocks C-ho Hoosac Fm

VT

Eugeosyncline Sequence Pelitic Rocks C-ho Hoosac Fm

VT

Eugeosyncline Sequence Mafic Rocks C-hog Hoosac Fm

VT

Grenville Belt Mafic Rocks C-hog Hoosac Fm

VT

Eugeosyncline Sequence Mafic Rocks C-ht Hoosac Fm, Turkey Mtn. Mbr.

VT

Eugeosyncline Sequence Pelitic Rocks C-hw

Hatch Hill and West Castleton

formations

VT

Grenville Shelf Sequence Pelitic Rocks C-m Monkton quartzite

VT

Grenville Shelf Sequence Pelitic Rocks C-m+C-d (See C-m and C-w)

VT

Grenville Shelf Sequence Pelitic Rocks C-mo Moosalamoo phyllite

VT

Eugeosyncline Sequence Pelitic Rocks C-o Ottauquechee Fm

VT

Eugeosyncline Sequence Mafic Rocks C-og Ottauquechee Fm

VT

Eugeosyncline Sequence Pelitic Rocks C-p Pinnacle Fm

VT

Eugeosyncline Sequence Pelitic Rocks C-p+C-ho (See C-p and C-ho)

Eugeosyncline Sequence Pelitic Rocks Omm+C-o

56

State Province Rock Group B Bedrock Unit Name/Description

VT Grenville Shelf Sequence Pelitic Rocks C-pa Parker slate

VT

Eugeosyncli

ne Sequence Sulfidic Schists C-pc Pinney Hollow Fm

VT

Eugeosyncline Sequence Mafic Rocks C-pg Pinney Hollow Fm

VT

Bronson Hill Sequence Mafic Rocks C-pg Pinney Hollow Fm

VT

Eugeosyncline Sequence Mafic Rocks C-pgc

Pinney Hollow Fm, Chester

amphibolite mbr.

VT

Eugeosyncline Sequence Pelitic Rocks C-ph Pinney Hollow Fm

VT

Eugeosyncline Sequence Mafic Rocks C-pt

Pinnacle Fm; Tibbit Hill

volcanic member

VT

Grenville Shelf

Sequence Carbonate Rocks C-rb Rugg Brook Fm

VT

Grenville Shelf

Sequence Pelitic Rocks C-s Sweetsburg Fm

VT

Eugeosyncline Sequence Pelitic Rocks C-s Sweetsburg Fm

VT

Grenville Shelf

Sequence Pelitic Rocks C-sa

Sweetsburg Fm; St. Albans slate

member

VT

Grenville Shelf

Sequence

Carbonate Rocks C-sb Saxe Brook dolomite

VT

Eugeosyncline Sequence Pelitic Rocks C-sbc St. Catherine Fm

VT

Eugeosyncline Sequence Pelitic Rocks C-sc St. Catherine Fm

VT

Eugeosyncline Sequence Pelitic Rocks C-scz St. Catherine Fm

VT

Grenville Shelf

Sequence Pelitic Rocks C-sh Sweetsburg Fm

VT

Grenville Shelf

Sequence Carbonate Rocks C-sr Sweetsburg Fm

VT

Grenville Shelf

Sequence Pelitic Rocks C-ssm Sweetsburg Fm

VT

Grenville Belt Pelitic Rocks C-t Tyson Fm.

VT

Eugeosyncline Sequence Pelitic Rocks C-u Underhill Fm.

VT

Eugeosyncline Sequence Pelitic Rocks C-ua

Underhill Fm, Mount Abraham

schist member

VT

Eugeosyncline Sequence Pelitic Rocks C-ub Underhill Fm, Battell Mbr.

VT

Eugeosyncline Sequence Pelitic Rocks C-uc Underhill Fm

VT

Eugeosyncline Sequence Pelitic Rocks C-ufb Underhill Fm; Foot Brook Mbr.

VT

Eugeosyncline Sequence Pelitic Rocks C-ufp

Underhill Fm.; Fairfield Pong

Mbr.

VT

Eugeosyncline Sequence Mafic Rocks C-ug Underhill Fm

VT

Eugeosyncline Sequence Pelitic Rocks C-uj Underhill Fm.; Jay Peak Mbr

VT

Eugeosyncline Sequence Mafic Rocks C-up

Underhill Fm.; Peaked Mountain

Mbr

VT

Eugeosyncline Sequence Carbonate Rocks C-uw Underhill Fm.; White Brook Mbr.

VT

Grenville Shelf

Sequence Carbonate Rocks C-w Winooski dolomite

VT

Waits River-Gile Mtn. Pelitic Rocks Dg Gile Mtn. Fm

VT

Waits River-Gile Mtn. Mafic Rocks Dga Gile Mtn. Fm

VT

Waits River-Gile Mtn. Pelitic Rocks Dgh Gile Mtn. Fm, Hall Stream Mbr

VT

Waits River-Gile Mtn. Pelitic Rocks Dgm

Gile Mtn. Fm, Meetinghouse

Slate Mbr

57

State Province Rock Group B Bedrock Unit Name/Description

VT

Bronson Hill Sequence Pelitic Rocks Dl Littleton Fm

VT

Bronson Hill Sequence Pelitic Rocks Dl Littleton Fm

VT

Waits River-Gile Mtn. Pelitic Rocks DSn Northfield Fm

VT

Eugeosyncline Sequence Pelitic Rocks DSn Northfield Fm

VT

Waits River-Gile Mtn. Calcpelite Dw Waits River Fm

VT

Waits River-Gile Mtn. Calcpelite Dwa

Waits River Fm.; Ayers Cliff

limestone Mbr

VT

Waits River-Gile Mtn. Calcpelite Dwb

Waits River Fm.; Barton River

Mbr

VT

Waits River-Gile Mtn. Metamorphic Rocks, other Dwc Waits River Fm, Crow Hill Mbr

VT

Waits River-Gile Mtn. Mafic Rocks Dws

Waits River Fm, Standing

Volcanic Pond Mbr

VT

Bronson Hill Sequence Granite, other hu undifferentiated granitic rocks

VT

Bronson Hill Sequence Granite, other nhb Bethlehem gneiss

VT

Waits River-Gile Mtn. Mafic Rocks nhd Metadiorite

VT

Waits River-Gile Mtn. Granite, other nhu Undifferentiated granitic rock

VT

Bronson Hill Sequence Granite, other nhu Undifferentiated granitic rock

VT

Eugeosyncline Sequence Granite, other nhu Undifferentiated granitic rock

VT

Waits River-Gile Mtn. Granite, other nhu+Omhb (See nhu and Omhb)

VT

Bronson Hill Sequence Mafic Rocks Oa Amonoosuc Volcanics

VT

Bronson Hill Sequence Pelitic Rocks Oal Albee Formation

VT

NH-ME Sequence Pelitic Rocks Oal Albee Formation

VT Grenville Shelf

Sequence Carbonate Rocks Ob

Bascom Fm., and Luke Hill,

Naylor Ledge,and Hastings Creek

limestone

VT Grenville Shelf

Sequence Pelitic Rocks Obb

Bascom Fm., and Luke Hill,

Naylor Ledge,and Hastings Creek

limestone

VT Grenville Shelf

Sequence Carbonate Rocks Oc

Cutting dolomite, and Morgan

Corner andWallace Creek

formations

VT

Grenville Shelf

Sequence Carbonate Rocks Ocb

Chipman, Bridport, and Beldens

Fm.; Providence Island dolomite

VT

Grenville Shelf

Sequence Carbonate Rocks Ocbe

Chipman, Bridport, and Beldens

Fm.; Providence Island dolomite

VT

Grenville Shelf

Sequence Carbonate Rocks Ocbr

Chipman, Bridport, and Beldens

Fm.; Providence Island dolomite

VT

Grenville Shelf

Sequence Pelitic Rocks Och Cumberland Head Fm

VT

Eugeosyncline Sequence Pelitic Rocks OC-s Stowe Formation

VT

Eugeosyncline Sequence Pelitic Rocks OC-sc Stowe Fm

VT

Eugeosyncline Sequence Mafic Rocks OC-sg Stowe Fm

VT

Eugeosyncline Sequence Mafic Rocks OC-sg+us (See OC-sg and us)

VT

Eugeosyncline Sequence Pelitic Rocks OC-u

Pinney Hollow Ottauquechee Fm,

and Stowe Formations

58

State Province Rock Group B Bedrock Unit Name/Description

VT

Grenville Shelf

Sequence Carbonate Rocks Ocw

Chipman, Bridport, and Beldens

Fm.; Providence Islanddolomite

VT

Grenville Shelf

Sequence Carbonate Rocks Ogl Glens Falls Fm.; Larrabee Mbr

VT

Grenville Shelf

Sequence Carbonate Rocks Ogo

Glens Falls and Orwell

limestone

VT

Grenville Shelf

Sequence Carbonate Rocks Ogs Glens Falls Fm.; Shoreham Mbr.

VT

Grenville Shelf

Sequence Pelitic Rocks Oh Hortonville Fm

VT

Grenville Shelf

Sequence Pelitic Rocks Oha Hathaway Fm

VT Grenville Shelf

Sequence Carbonate Rocks Ohg

Hortonville, or Cumberland

Head, and Glens Falls

formations

VT

Grenville Shelf

Sequence

Carbonate Rocks Ohi Highgate Fm

VT

Grenville Shelf

Sequence Pelitic Rocks Oi Iberville Fm

VT

Eugeosyncline Sequence Mafic Rocks Omb

Missisquoi Fm, Barnard Volcanic

Mbr

VT

Eugeosyncline Sequence Sulfidic Schists Omc Missisquoi Fm

VT

Eugeosyncline Sequence Mafic Rocks Omco

Missisquoi Fm; Coburn Hill

Volcanic Mbr

VT

Eugeosyncline Sequence Pelitic Rocks Omcr Missisquoi Fm, Cram Hill Mbr

VT

Eugeosyncline Sequence Pelitic Rocks Omh Mount Hamiltion Fm

VT

Eugeosyncline Sequence Pelitic Rocks Omhb

Missisquoi Fm.; Harlow Bridge

quartzite member

VT

Grenville Shelf

Sequence Carbonate Rocks Omi

Middlebury and Chazy limestone;

Youngman and Carman formations

VT

Grenville Shelf

Sequence Carbonate Rocks Omic Middlebury and Chazy limestone.

VT

Grenville Shelf

Sequence Carbonate Rocks Omid Middlebury and Chazy limestone

VT

Grenville Shelf

Sequence Carbonate Rocks Omiv Middlebury and Chazy limestone

VT

Grenville Shelf

Sequence

Carbonate Rocks Omiv+Omid+Om (See Omiv, Omid, Om)

VT

Grenville Shelf

Sequence Pelitic Rocks Oml Morses Line Fm

VT

Eugeosyncline Sequence Pelitic Rocks Omm Missisquoi Fm, Moretown Mbr

VT

Eugeosyncline Sequence Carbonate Rocks Omu

Missisquoi Fm.; Umbrella Hill

Mbr

VT

Eugeosyncline Sequence Pelitic Rocks Omw

Missisquoi Fm, Whetstone Hill,

Mbr

VT

Grenville Shelf

Sequence Carbonate Rocks Oo

Orwell limestone, and Isle La

Motte and Lowville limestones

VT

Bronson Hill Sequence Pelitic Rocks Oof Orfordville Fm

VT

Bronson Hill Sequence Mafic Rocks Oop

Orfordville Fm, Post Volcanic

Pond Mbr

VT

Grenville Shelf

Sequence Pelitic Rocks Oor

Orwell limestone, and Isle La

Motte and Lowville limestones

VT

Bronson Hill Sequence Mafic Rocks Oos

Orfordville Fm.; Sunday

Mountain volcanics

59

State Province Rock Group B Bedrock Unit Name/Description

T

Bronson Hill Sequence Sulfidic Schists Op Partridge Fm

VT

Eugeosyncline Sequence Pelitic Rocks Opa Pawlet Fm

VT

Bronson Hill Sequence Sulfidic Schists Opv Partridge Fm

VT

Grenville Shelf

Sequence Carbonate Rocks Os

Shelburne, Whitehall, and

Strites Pond formations

VT

Grenville Shelf

Sequence Pelitic Rocks Osp Stony Point Fm

VT

Grenville Shelf

Sequence Pelitic Rocks Osp+Oi (See Osp and Oi)

VT

Bronson Hill Sequence Granite, other ou Biotite quartz diorite gneiss

VT

Grenville Belt Metamorphic Rocks, other pC Mount Holly Complex

VT

Grenville Belt Grenville Granites pCg

gneissic biotite granite,

quartz monzonite,and

granodiorite

VT

Grenville Belt Grenville Granites pCgn

gneiss, quartzite, calc-

silicate granulite

VT

Grenville Belt Carbonate Rocks pCm Mount Holly Complex

VT

Grenville Belt Metamorphic Rocks, other pCsg Stamford gneiss

VT

Grenville Belt Metamorphic Rocks, other pCsq

Mount Holly Complex, quartzite

mbr

VT

Grenville Belt Metamorphic Rocks, other pCsq+C-t (See pCsq and C-t)

VT

Bronson Hill Sequence Metamorphic Rocks, other Sc Clough Fm

VT

Waits River-Gile Mtn. Metamorphic Rocks, other Sf Fitch Fm

VT

Bronson Hill Sequence Metamorphic Rocks, other Sf Fitch Fm

VT

Waits River-Gile Mtn. Calcpelite Ss

Shaw Mtn. Fm. (south of 44

degrees latitude)

VT

Eugeosyncline Sequence Calcgranofels Ss

Shaw Mtn. Fm. (south of 44

degrees latitude)

VT

Eugeosyncline Sequence Ultramafic Rocks udp

Dunite, peridotite, and

serpentinite

VT

Eugeosyncline Sequence Ultramafic Rocks us

Serpentinite, carbonate rock,

talc-carbonate rock, and

steatite

VT

Eugeosyncline Sequence Ultramafic Rocks uu

Undifferentiated ultramafic

rocks

VT

Grenville Belt Mafic Rocks wd

Hornblende-biotite diorite;

gabbro

VT

Waits River-Gile Mtn. Mafic Rocks wd

Hornblende-biotite diorite;

gabbro

VT

Waits River-Gile Mtn. Alkali Granite we Essexite

VT

Grenville Belt Alkali Granite we Essexite

VT

Waits River-Gile Mtn. Granite, other wg Biotite and hornblende granites

VT

Waits River-Gile Mtn. Alkali Granite wg Biotite and hornblende granites

VT

Grenville Shelf

Sequence Basalt wle Bostonite

VT

Grenville Belt Alkali Granite wn Nepheline syenite and pulaskite

60

State Province Rock Group B Bedrock Unit Name/Description

VT

Grenville Belt Alkali Granite ws

Hornblende, biotite, quartz,

and augite syenites

VT

Waits River-Gile Mtn. Alkali Granite ws

Hornblende, biotite, quartz,

and augite syenites

VT

Waits River-Gile Mtn. Felsic Volcanics wv

Volcanic breccia, felsitic

tuft, and flows

VT

Grenville Belt Felsic Volcanics wv

Volcanic breccia, felsitic

tuft, and flows