## GeMS validation of CTBedrockRodgers1985.gdb

File written by GeMS_ValidateDatabase.py, version of 10/24/2024
Fri Jan 10 14:57:16 2025
Runtime parameters
Database path: S:\GEOLOGICAL SURVEY\Devin\GEMS\764_CTBedrockRodgers1985\NGMDB_revision\CTBedrockRodgers1985\CT_2020_BedrockRodgers1985-submittal\CT_2020_BedrockRodgers1985-publication\CT_2020_BedrockRodgers1985-database\CTBedrockRodgers1985.gdb
Output directory: S:\GEOLOGICAL SURVEY\Devin\GEMS\764_CTBedrockRodgers1985\NGMDB_revision\CTBedrockRodgers1985\CT_2020_BedrockRodgers1985-submittal
Metadata file: None
Check embedded metadata: False
Skip topology check: False
Refresh GeoMaterialDict: True
Delete extra rows in Glossary and DataSources: False
Compact GDB: True
This database is LEVEL 3 COMPLIANT.
Check Metadata option was skipped. Be sure to have prepared valid metadata and check this option to produce a complete report.
This file should be accompanied by CTBedrockRodgers1985.gdb-ValidationErrors.html and a metadata summary from mp in the same directory.
If this database will be submitted to the NGMDB, it also needs to be accompanied by a reviewed Geologic Names report that includes identification of any suggested modifications to Geolex. Use the Geologic Names Check tool to generate that report or provide other documentation of a review.
Back to Top

### Contents

Compliance Criteria
Warnings
Content not specified in GeMS schema
Occurrence of MapUnits in DMU, feature datasets, or geopackage tables
Contents of Nonspatial Tables
DataSources
DescriptionOfMapUnits
Glossary
Database Inventory

### Compliance Criteria

#### LEVEL 1

Criteria for a LEVEL 1 GeMS database are:

- No overlaps or internal gaps in map-unit polygon layer
- Contacts and faults in single feature class
- Map-unit polygon boundaries are covered by contacts and faults lines

Databases with a variety of schema may meet these criteria. This script cannot confirm LEVEL 1 compliance.

#### LEVEL 2--MINIMALLY COMPLIANT

A LEVEL 2 GeMS database is accompanied by a peer-reviewed Geologic Names report, including identification of suggested modifications to Geolex, and meets the following criteria:

2.1 Has required elements: nonspatial tables DataSources, DescriptionOfMapUnits, GeoMaterialDict; feature dataset GeologicMap with feature classes ContactsAndFaults and MapUnitPolys | PASS
2.2 Required fields within required elements are present and correctly defined | PASS
2.3 All MapUnitPolys and ContactsAndFaults based feature classes obey Level 2 topology rules: no internal gaps or overlaps in MapUnitPolys, boundaries of MapUnitPolys are covered by ContactsAndFaults | PASS
2.4 All map units in MapUnitPolys have entries in DescriptionOfMapUnits table | PASS
2.5 No duplicate MapUnit values in DescriptionOfMapUnit table | PASS
2.6 Certain field values within required elements have entries in Glossary table | PASS
2.7 No duplicate Term values in Glossary table | PASS
2.8 All xxxSourceID values in required elements have entries in DataSources table | PASS
2.9 No duplicate DataSources_ID values in DataSources table | PASS

#### LEVEL 3--FULLY COMPLIANT

A LEVEL 3 GeMS database meets these additional criteria:

3.1 Table and field definitions beyond Level 2 conform to GeMS schema | PASS
3.2 All MapUnitPolys and ContactsAndFaults based feature classes obey Level 3 topology rules: No ContactsAndFaults overlaps, self-overlaps, or self-intersections. | PASS
3.3 No missing required values | PASS
3.4 No missing terms in Glossary | PASS
3.5 No unnecessary terms in Glossary | PASS
3.6 No missing sources in DataSources | PASS
3.7 No unnecessary sources in DataSources | PASS
3.8 No map units without entries in DescriptionOfMapUnits | PASS
3.9 No unnecessary map units in DescriptionOfMapUnits | PASS
3.10 HierarchyKey values in DescriptionOfMapUnits are unique and well formed | PASS
3.11 All values of GeoMaterial are defined in GeoMaterialDict. GeoMaterialDict is as specified in the GeMS standard | PASS
3.12 No duplicate _ID values | PASS
3.13 No zero-length, whitespace-only, or bad null values | PASS

### Warnings

There are 1 warnings

### Content not specified in GeMS schema

Some of the extensions to the GeMS schema identified here may be necessary to capture geologic content and are entirely appropriate. Please document these extensions in metadata for the database, any accompanying README file, and (if applicable) any transmittal letter that accompanies the dataset. Other extensions may be intermediate datasets, fields, or files that should be deleted before distribution of the database.

#### Fields

DescriptionOfMapUnits, Notes
MapUnitPolys, FORMATION
MapUnitPolys, TERR_COD
MapUnitPolys, TERRANE
MapUnitPolys, LITHO1
MapUnitPolys, LITHO2
MapUnitPolys, LITHO3
MapUnitPolys, LITHO4
MapUnitPolys, LITHO5
MapUnitPolys, AGE
MapUnitPolys, TIME_
MapUnitPolys, ACREAGE
MapUnitPolys, AREA_SQMI
MapUnitPolys, DEFINITION
ContactsAndFaults, RuleID1
ContactsAndFaults, Override1
ContactsAndFaults, Age
ContactsAndFaults, CLASS_COD
ContactsAndFaults, DEFINITION
ContactsAndFaults, AV_LEGEND
ContactsAndFaults, TERRB_COD
ContactsAndFaults, TERR_BNDRY
CSAContactsAndFaults, RuleID1
CSAContactsAndFaults, Override1
CSBContactsAndFaults, RuleID1
CSBContactsAndFaults, Override1
CSCContactsAndFaults, RuleID1
CSCContactsAndFaults, Override1
CSDContactsAndFaults, RuleID1
CSDContactsAndFaults, Override1
CSEContactsAndFaults, RuleID1
CSEContactsAndFaults, Override1
OrientationPoints, StationID
OrientationPoints, RuleID1
OrientationPoints, Override1
CMUMapUnitPolys, Notes
CMULines, Label
CMULines, Notes
CMULines, RuleID

#### Tables

CorrelationOfMapUnits
CrossSectionA
CrossSectionB
CrossSectionC
CrossSectionD
CrossSectionE
ContactsAndFaultsAnno
MapUnitPolysAnno
CartographicLinesAnno
OrientationPoints_selectionAnno
CMUText
CMUOtherPolys
CSAText
CSBText
CSCText
CSDText
CSEText

### Occurrence of MapUnit in DMU, feature datasets, or geopackage tables

MapUnit | DescriptionOfMapUnits | CrossSectionE | CrossSectionA | GeologicMap | CrossSectionB | CrossSectionC | CrossSectionD | CorrelationOfMapUnits
--- | --- | --- | --- | --- | --- | --- | --- | ---
Oqb | X | -- | -- | X | -- | X | -- | X
Ow | X | -- | X | X | -- | -- | X | X
Or | X | X | X | X | -- | -- | X | X
Och | X | X | X | X | -- | X | X | X
Otfs | X | -- | -- | X | -- | -- | -- | X
Dc | X | -- | X | X | X | X | X | X
Obs | X | -- | -- | X | -- | -- | X | X
Zw+Zsc+Pn | X | -- | -- | X | -- | -- | -- | --
Zsc | X | -- | -- | -- | -- | -- | -- | X
D?d | X | -- | X | X | -- | X | -- | X
Oml | X | X | -- | X | -- | -- | -- | X
Obr | X | X | X | X | X | X | X | X
Pnm | X | -- | -- | X | -- | -- | -- | X
Otfg | X | -- | -- | X | -- | -- | -- | X
Pw | X | -- | -- | X | -- | -- | -- | X
Dblm | X | -- | X | X | -- | X | -- | X
Omal | X | -- | -- | X | -- | -- | -- | X
Csc | X | -- | X | X | -- | -- | X | X
Jb | X | X | X | X | -- | X | X | X
Op | X | -- | -- | X | -- | -- | -- | X
Op+Oq | X | -- | -- | X | -- | -- | -- | --
Otw | X | -- | -- | X | -- | -- | -- | X
Ohb | X | X | -- | X | -- | -- | -- | X
Osg | X | -- | -- | X | -- | -- | -- | X
Cwb | X | X | -- | X | -- | -- | -- | X
Zsph | X | X | -- | X | X | -- | -- | X
Dld | X | -- | -- | X | -- | -- | X | X
Ch | X | -- | X | X | -- | -- | X | X
Dgg | X | -- | X | X | -- | X | -- | X
Jta | X | -- | -- | X | -- | -- | -- | X
SOh | X | X | X | X | X | X | X | X
Otf | X | X | -- | X | -- | -- | -- | X
Yga | X | X | -- | X | -- | -- | -- | X
Ose | X | -- | X | X | -- | -- | X | X
Ce | X | -- | X | X | -- | -- | X | X
Omu | X | X | -- | X | -- | -- | -- | X
Opd | X | -- | -- | X | -- | -- | -- | X
l | X | X | X | X | X | X | X | --
SOsp | X | -- | -- | X | -- | X | -- | X
Otb | X | X | -- | X | -- | -- | -- | X
Or? | X | -- | -- | X | -- | -- | -- | --
Oh | X | -- | -- | X | -- | -- | -- | X
Dl | X | -- | -- | X | X | -- | X | X
Pzmy | X | -- | -- | X | -- | -- | -- | X
Pzu | X | X | X | -- | -- | -- | X | --
Ygh | X | X | X | X | -- | -- | X | X
Cd | X | X | X | X | -- | -- | X | X
Ohp | X | X | -- | X | -- | -- | -- | X
SObl | X | -- | X | X | -- | X | -- | X
Omo | X | X | X | X | -- | X | X | X
Ocm | X | -- | X | X | -- | -- | X | X
Jwr | X | X | -- | X | -- | -- | -- | X
Jb? | X | -- | -- | X | -- | -- | -- | --
Om? | X | -- | -- | X | -- | -- | -- | --
Jsi | X | -- | -- | X | -- | -- | -- | X
Otay | X | -- | X | X | X | X | X | X
Oo | X | -- | -- | X | -- | -- | -- | X
Zw | X | -- | -- | X | X | -- | X | X
Zp+Zsc+Pn | X | -- | -- | X | -- | -- | -- | --
Zpq+Zsc+Pn | X | -- | -- | X | -- | -- | -- | --
Otwv | X | -- | -- | X | -- | -- | -- | X
OCr+OCra | X | -- | -- | X | -- | -- | -- | --
Cc | X | -- | -- | X | -- | -- | -- | X
Zsp | X | -- | -- | X | -- | X | -- | X
Csa | X | -- | X | X | -- | -- | X | X
Om | X | X | X | X | X | X | X | X
Otf+Og | X | -- | -- | X | -- | -- | -- | --
Ots | X | -- | -- | X | -- | -- | -- | X
Ocg | X | -- | X | X | -- | -- | X | X
Owm | X | X | X | X | -- | -- | X | X
Jmf | X | X | X | -- | -- | -- | X | --
Ogh | X | X | -- | X | -- | -- | -- | X
Ogh? | X | -- | -- | X | -- | -- | -- | --
Ogl | X | -- | X | X | -- | X | X | X
Dlp | X | -- | -- | X | -- | -- | -- | X
Ppa | X | -- | -- | X | -- | -- | -- | X
Zspp | X | -- | -- | X | -- | -- | -- | X
SOs? | X | -- | X | X | -- | X | -- | --
Jho | X | -- | X | X | -- | -- | -- | X
Dn | X | -- | -- | X | -- | -- | -- | X
Oa+Oma | X | -- | -- | X | -- | -- | -- | --
Og | X | X | -- | X | -- | -- | -- | X
TRnh | X | X | X | X | -- | -- | X | X
Zsh | X | X | X | X | X | X | X | X
Zp+Zsph+Pn | X | X | -- | X | X | -- | -- | --
Or+Ora | X | -- | -- | X | -- | -- | -- | --
Jha | X | -- | X | X | -- | -- | -- | X
Jp | X | X | X | X | -- | X | X | X
Dce | X | -- | -- | X | -- | X | -- | X
Dm | X | -- | -- | X | -- | -- | -- | X
Ota | X | X | X | X | X | X | X | X
Yg | X | X | X | X | -- | -- | X | X
Ygn | X | -- | X | X | -- | -- | X | X
Zb | X | -- | -- | -- | -- | -- | -- | X
Otfc | X | -- | -- | X | -- | -- | -- | X
Ot | X | X | -- | X | -- | -- | -- | X
DSsq | X | -- | -- | X | -- | -- | -- | X
SObu | X | -- | X | X | -- | X | -- | X
Ol | X | -- | -- | X | -- | -- | -- | X
Otaf | X | -- | X | X | X | X | X | X
Oc | X | X | -- | X | -- | -- | -- | X
Og? | X | -- | -- | X | -- | -- | -- | --
Ohn | X | -- | -- | X | -- | -- | -- | X
Ot+Oc | X | X | -- | X | -- | -- | -- | X
OCra | X | -- | -- | -- | -- | -- | -- | X
SOs | X | -- | X | X | -- | X | -- | X
Zw+Zb | X | -- | -- | X | -- | -- | -- | --
Sbf | X | -- | -- | X | -- | -- | -- | X
Zpq | X | X | -- | X | X | X | -- | X
Ora | X | -- | -- | X | -- | -- | -- | X
Zss | X | -- | X | X | -- | X | X | X
Zwm | X | X | -- | X | X | -- | -- | X
Oma | X | -- | -- | X | -- | -- | -- | X
Omau | X | -- | -- | X | -- | -- | -- | X
Zsph+Pn | X | -- | -- | X | -- | -- | -- | --
Dng | X | -- | -- | X | -- | -- | -- | X
Ocs | X | -- | X | X | -- | -- | X | X
Zwr | X | X | -- | X | X | -- | -- | X
Zwn | X | X | -- | X | X | -- | -- | X
Ygs | X | -- | X | X | -- | -- | X | X
DSts | X | -- | -- | X | -- | -- | -- | X
u | X | X | -- | X | -- | -- | -- | X
De | X | -- | -- | X | -- | X | -- | X
Zp | X | X | X | X | X | X | X | X
Cma | X | -- | -- | X | -- | -- | -- | X
Jwr? | X | -- | -- | X | -- | -- | -- | --
OCs | X | X | -- | X | -- | -- | X | X
Cmcu | X | -- | -- | X | -- | -- | X | X
Ygr | X | -- | X | X | -- | -- | X | X
Jeb | X | -- | X | X | -- | -- | -- | X
Oh? | X | -- | -- | X | -- | -- | -- | --
Dbl | X | -- | X | X | -- | X | X | X
Jsm | X | -- | X | X | -- | -- | -- | X
OCr | X | X | X | X | -- | -- | X | X
Dbl? | X | -- | X | X | -- | -- | -- | --
Zl | X | -- | -- | X | -- | -- | -- | X
Omm | X | -- | X | X | -- | -- | -- | X
Cm | X | X | -- | X | -- | -- | -- | X
Csb | X | -- | X | X | -- | -- | X | X
Pn | X | X | -- | X | -- | -- | -- | X
Pp | X | -- | -- | X | -- | -- | -- | X
Sbc | X | -- | X | X | -- | X | X | X
Ochv | X | -- | -- | X | -- | -- | -- | X
SObm | X | -- | X | X | -- | X | -- | X
Ps | X | X | -- | X | -- | -- | -- | X
Cmcl | X | -- | X | X | -- | -- | X | X
Ob | X | X | -- | X | -- | -- | -- | X
TRnh+Jb | X | -- | -- | X | -- | -- | -- | --
DSt | X | X | X | X | -- | -- | X | X
Cmcub | X | -- | -- | X | -- | -- | -- | X
DSs | X | -- | -- | X | -- | X | X | X
Zwnj | X | X | -- | X | X | -- | -- | X
Obr? | X | -- | X | X | -- | X | -- | --
Oq | X | -- | X | X | -- | X | X | X
Ohc | X | -- | -- | X | -- | -- | X | X
Obrg | X | -- | X | X | X | X | -- | X
DSw | X | X | -- | X | -- | -- | -- | X
Oqf | X | -- | -- | X | -- | -- | -- | X
Zsc+Pn | X | -- | -- | X | -- | -- | -- | --
OCr? | X | -- | -- | X | -- | -- | -- | --
Stb | X | -- | -- | X | -- | -- | -- | X
Oa | X | -- | -- | X | -- | -- | -- | X

### Contents of Nonspatial Tables

#### DataSources

OBJECTID | Source | Notes | URL | DataSources_ID
--- | --- | --- | --- | ---
3 | Neuendorf, K.K.E., Mehl, J.P., Jackson, J.A., 2011, Glossary of Geology, Fifth Edition, Revised. American Geoscience Institute. | None | None | AGI
5 | Modified from Neuendorf, K.K.E., Mehl, J.P., Jackson, J.A., 2011, Glossary of Geology, Fifth Edition, Revised. American Geoscience Institute. | Definitions have been modified to best describe features specific to this geodatabase. | None | AGI-Modified
6 | Connecticut Geological and Natural History Survey Staff. | Definitions were created by CGNHS staff in 2019-2021. | None | CGNHS
1 | Federal Geographic Data Committee [prepared for the Federal Geographic Data Committee by the U.S. Geological Survey], 2006, FGDC Digital Cartographic Standard for Geologic Map Symbolization: Reston, Va., Federal Geographic Data Committee Document Number FGDC-STD-013-2006, 290 p., 2 plates. | None | https://ngmdb.usgs.gov/fgdc_gds/geolsymstd.php | FGDC-STD-013-2006
7 | U.S. Geological Survey National Cooperative Geologic Mapping Program, 2020, GeMS (Geologic Map Schema)—A standard format for the digital publication of geologic maps: U.S. Geological Survey Techniques and Methods, book 11, chap. B10, 74 p. | None | https://doi.org/10.3133/tm11B10 | GeMS
2 | Rodgers, John, 1985, Bedrock geological map of Connecticut: Connecticut Geological and Natural History Survey, Department of Environmental Protection, 2 sheets, scale 1:125,000. | None | None | Rodgers-1985
4 | Rodgers, 1985, compilation sheets (1:24,000) and statewide compilation (1:125,000). | These data were compiled by the Conn. Geological Survey, DEP. Produced under a Conn. Source Water Assessment Program study of geological factors by the USGS and CGNHS, DEP in 2002-2003. This program was an outgrowth of the US EPA administered National Safe Drinking Water Act Amendments of 1996. | https://portal.ct.gov/DEEP/Geology/Geology-Archives/Rodgers-Paper, https://portal.ct.gov/DEEP/Geology/Geology-Archives/Rodgers-Mylar, http://cteco.uconn.edu/maps/state/Bedrock_Geologic_Map_of_Connecticut.pdf | Rodgers-Compilations

#### DescriptionOfMapUnits

OBJECTID | MapUnit | Name | FullName | Age | Description | HierarchyKey | ParagraphStyle | Label | Symbol | AreaFillRGB | AreaFillPatternDescription | DescriptionSourceID | GeoMaterial | GeoMaterialConfidence | DescriptionOfMapUnits_ID | Notes
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
9 | None | Western Uplands | None | None | None | 01 | Heading1 | None | None | None | None | Rodgers-1985 | None | None | DMU001 | None
10 | None | Proto-North American (Continental) Terrane | None | None | None | 01-01 | Heading2 | None | None | None | None | Rodgers-1985 | None | None | DMU002 | None
11 | None | Taconic Allochthons (Displaced Iapetos Terrane) | None | None | None | 01-01-01 | Heading3 | None | None | None | None | Rodgers-1985 | None | None | DMU003 | None
12 | None | Stratified Rocks | None | None | None | 01-01-01-01 | Heading4 | None | None | None | None | Rodgers-1985 | None | None | DMU004 | None
13 | Ce | Everett Schist | Everett Schist | Cambrian? | Grayish to greenish (some rusty-weathering), fine-to medium-grained, foliated but poorly layered schist or phyllite, composed or quartz, albite or oligoclase, muscovite, garnet, staurolite or chloritoid, and generally chlorite. Local layers are dark-gray to silvery schist or phyllite | 01-01-01-01-01 | DMU1 | _e | Ce | 223,209,000 | Solid | Rodgers-1985 | Schist and gneiss, of sedimentary-rock origin | High | DMU005 | None
14 | Cm | Manhattan Schist | Manhattan Schist | Cambrian? | (Including Waramaug Formation and Canaan Mountain Schist) Dark-gray to silvery, rusty-weathering, generally coarse grained, foliated but poorly layered to massive gneiss or schistose gneiss, composed of quartz, oligoclase, microcline, biotite, and muscovite, and generally sillimanite and garnet. Amphibolite layers locally, especially near base where in places separately mapped as unit Cma | 01-01-01-01-02 | DMU1 | _m | Cm | 223,209,000 | Solid | Rodgers-1985 | Schist and gneiss, of sedimentary-rock origin | High | DMU006 | None
15 | Cmcu | Upper Slice of Canaan Mountain Schist | Upper Slice of Canaan Mountain Schist | Cambrian? | Dark-gray to silvery, generally rusty weathering, medium- to coarse-grained, well-foliated, massive to well-layered schist and schistose gneiss, composed of quartz, plagioclase, biotite, muscovite, and generally garnet and sillimanite; also layers of amphibolite | 01-01-01-01-02-01 | DMU2 | _mcu | Cmcu | 186,165,000 | Solid | Rodgers-1985 | Schist and gneiss, of sedimentary-rock origin | High | DMU007 | None
16 | Cmcub | Basal Member of Upper Slice of Canaan Mountain Schist | Basal Member of Upper Slice of Canaan Mountain Schist | Cambrian? | Gray, generally rusty- or tan-weathering gneiss, composed of quartz, plagioclase, microcline, biotite, and muscovite, interlayered with feldspathic quartzite | 01-01-01-01-02-02 | DMU2 | _mcub | Cmcub | 255,222,173 | Solid | Rodgers-1985 | Schist and gneiss, of sedimentary-rock origin | High | DMU008 | None
17 | Cmcl | Lower Slice of Canaan Mountain Schist | Lower Slice of Canaan Mountain Schist | Cambrian? | Dark-gray, rusty-weathering, coarse-grained, well-foliated and moderately well layered schist composed of quartz, plagioclase, biotite, muscovite, and generally garnet and sillimanite (or minor staurolite). Amphibolite layers rather rare | 01-01-01-01-02-03 | DMU2 | _mcl | Cmcl | 223,209,000 | Solid | Rodgers-1985 | Schist and gneiss, of sedimentary-rock origin | High | DMU009 | None
18 | Cma | Amphibolite-bearing unit of Manhattan Schist | Amphibolite-bearing unit of Manhattan Schist | Cambrian? | Like Manhattan Schist but with numerous lenses and layers of amphibolite | 01-01-01-01-02-04 | DMU2 | _ma | Cma | 255,135,000 foreground; 223,209,000 background | Randomly placed and oriented "v"s over a solid background | Rodgers-1985 | Meta-mafic rock | High | DMU010 | None
19 | Ch | Hoosac Schist | Hoosac Schist | Cambrian? | Light-to medium-gray, rusty-weathering, fine- to medium-grained schist and poorly layered schistose gneiss, composed of quartz, biotite, plagioclase, muscovite, and generally garnet and sillimanite or kyanite | 01-01-01-01-03 | DMU1 | _h | Ch | 223,209,000 | Solid | Rodgers-1985 | Schist and gneiss, of sedimentary-rock origin | High | DMU011 | None
20 | None | Ordovician and Cambrian Shelf Sequence | None | None | None | 01-01-02 | Heading3 | None | None | None | None | Rodgers-1985 | None | None | DMU012 | None
21 | None | Stratified Rocks | None | None | None | 01-01-02-01 | Heading4 | None | None | None | None | Rodgers-1985 | None | None | DMU013 | None
22 | Ow | Walloomsac Schist | Walloomsac Schist | Middle Ordovician | Black to dark-or silvery-gray, rarely layered schist or phyllite, composed of quartz, albite, and commonly garnet and staurolite or sillimanite (locally strongly retrograded to chlorite and muscovite). Locally feldspathic or calcareous near the base | 01-01-02-01-01 | DMU1 | Ow | Ow | 124,186,090 | Solid | Rodgers-1985 | Schist and gneiss, of sedimentary-rock origin | High | DMU014 | None
23 | Owm | Basal Marble Member of Walloomsac Schist | Basal Marble Member of Walloomsac Schist | Middle Ordovician | Dark-gray to white, massive to layered schistose or phyllitic calcite-phlogopite marble | 01-01-02-01-01-01 | DMU2 | Owm | Owm | 110,179,254 | Solid | Rodgers-1985 | Meta-carbonate rock | High | DMU015 | None
24 | OCs | Stockbridge Marble | Stockbridge Marble | Lower Ordovician and Cambrian | (Including Inwood Marble) White to gray, massive to layered marble, generally dolomitic but containing calcite marble in upper part, locally interlayered with schist or phyllite and with calcareous siltstone or sandstone | 01-01-02-01-02 | DMU1 | O_s | OCs | 224,255,255 | Solid | Rodgers-1985 | Meta-carbonate rock | High | DMU016 | None
25 | Osg | Units g and f of Stockbridge Marble | Units g and f of Stockbridge Marble | Lower Ordovician | White to gray massive calcite marble with layers and laminae of dolomitic marble | 01-01-02-01-02-01 | DMU2 | Osg | Osg | 240,255,255 | Solid | Rodgers-1985 | Meta-carbonate rock | High | DMU017 | None
26 | Ose | Units e and d of Stockbridge Marble | Units e and d of Stockbridge Marble | Lower Ordovician | White to gray massive calcite marble, commonly mottled with dolomite and locally interlayered with dolomite marble and calcareous siltstone and sandstone | 01-01-02-01-02-02 | DMU2 | Ose | Ose | 176,224,230 | Solid | Rodgers-1985 | Meta-carbonate rock | High | DMU018 | None
27 | Csc | Unit c of Stockbridge Marble | Unit c of Stockbridge Marble | Upper Cambrian | Gray, generally massive dolomite marble, commonly contains quartz grains, locally beds of sandstone; may be calcitic near top | 01-01-02-01-02-03 | DMU2 | _sc | Csc | 224,255,255 | Solid | Rodgers-1985 | Meta-carbonate rock | High | DMU019 | None
28 | Csb | Unit b of Stockbridge Marble | Unit b of Stockbridge Marble | Upper and Middle? Cambrian | White, pink, cream, and light-gray, generally well-bedded dolomitic marble interlayered with phyllite and schist and with siltstone, sandstone, or quartzite, commonly dolomitic | 01-01-02-01-02-04 | DMU2 | _sb | Csb | 176,224,230 | Solid | Rodgers-1985 | Meta-carbonate rock | High | DMU020 | None
29 | Csa | Unit a of Stockbridge Marble | Unit a of Stockbridge Marble | Lower Cambrian | White to pale-gray, massive, smooth-weathering dolomite marble | 01-01-02-01-02-05 | DMU2 | _sa | Csa | 135,206,235 | Solid | Rodgers-1985 | Meta-carbonate rock | High | DMU021 | None
30 | Cc | Cheshire Quartzite | Cheshire Quartzite | Lower Cambrian | Mainly pure, white, glassy, tough quartzite | 01-01-02-01-03 | DMU1 | _c | Cc | 254,172,000 | Solid | Rodgers-1985 | Quartzite | High | DMU022 | None
31 | Cd | Dalton Formation | Dalton Formation | Lower Cambrian and perhaps partly older | (Including Poughquag Quartzite and Lowerre Formation) Gray, tan-weathering, medium grained, generally well layered gneiss or feldspathic quartzite, composed of quartz, microcline, plagioclase, muscovite, biotite, and generally tourmaline; some schistose micaceous layers have sillimanite, commonly as quartz-sillimanite nodules rimmed with muscovite. Layers of purer quartzite in many areas, especially near the top or where the formation is thin | 01-01-02-01-04 | DMU1 | _d | Cd | 254,190,000 | Solid | Rodgers-1985 | Quartzite | High | DMU023 | None
32 | None | Proterozoic Massifs "Grenville" | None | None | None | 01-01-03 | Heading3 | None | None | None | None | Rodgers-1985 | None | None | DMU024 | None
33 | Yg | Gneiss of Highland Massifs | Gneiss of Highland Massifs | Proterozoic Y (may contain some older rocks) | (Including Fordham Gneiss) Mixture of rock types described below, where not separately mapped | 01-01-03-01 | DMU1 | Yg | Yg | 245,222,179 | Solid | Rodgers-1985 | Metaigneous rock | High | DMU025 | None
34 | Ygr | Pink Granitic Gneiss | Pink Granitic Gneiss | Proterozoic Y | Light-pink to gray, medium- to coarse-grained, foliated but generally massive or poorly layered granitic gneiss, composed of quartz, microcline, oligoclase, and either biotite or muscovite or both, also locally amphibole or epidote | 01-01-03-01-01 | DMU2 | Ygr | Ygr | 255,199,174 | Solid | Rodgers-1985 | Meta-felsic and intermediate rock | High | DMU026 | None
35 | Yga | Augen Gneiss | Augen Gneiss | Proterozoic Y | (Including local term 'Danbury Gneiss' , equivalent in part to Tyringham Gneiss of Massachusetts) Medium-gray to spotted, fine- to medium-grained, porphyritic, foliated and lineated granitic gneiss, composed of microcline (largely as megacrysts or augen up to 10 cm long), quartz, albite, or oligoclase, biotite and minor hornblende | 01-01-03-01-02 | DMU2 | Yga | Yga | 254,181,118 | Solid | Rodgers-1985 | Meta-felsic and intermediate rock | High | DMU027 | None
36 | Ygn | Layered Gneiss | Layered Gneiss | Proterozoic Y | Gray, medium-grained, well-foliated and generally well layered, light and dark, but locally wispy gneiss, composed of quartz and plagioclase, with microcline locally in the light layers and abundant biotite and common hornblende in the dark layers; garnet or epidote locally. Layers and lenses of calc-silicate rock and amphibolite in some areas | 01-01-03-01-03 | DMU2 | Ygn | Ygn | 245,222,179 | Solid | Rodgers-1985 | Metaigneous rock | High | DMU028 | None
37 | Ygh | Hornblende Gneiss and Amphibolite | Hornblende Gneiss and Amphibolite | Proterozoic Y | Dark-gray to mottled, fine- to medium-grained, massive to foliated amphibolite and gneiss, composed of hornblende and plagioclase, also commonly biotite and minor quartz; commonly interlayered with banded felsic gneiss. Locally contains calc-silicate rock or diopsidic calcite marble | 01-01-03-01-04 | DMU2 | Ygh | Ygh | 222,204,222 lines; 171,171,171 background | Diagonal right-down lines 1 pt thick, separation: 2 pts, angle: 135 degrees. Over solid background. | Rodgers-1985 | Meta-mafic rock | High | DMU029 | None
38 | Ygs | Rusty Mica Schist and Gneiss | Rusty Mica Schist and Gneiss | Proterozoic Y (may contain some older rocks) | (Equivalent in part to Washington Gneiss of Massachusetts) Dark-gray, rusty-weathering, well-foliated and well- to poorly layered schist and gneiss composed of quartz, plagioclase, biotite, muscovite, sillimanite, and locally garnet; some layers of feldspathic quartzite and garnetiferous amphibolite | 01-01-03-01-05 | DMU2 | Ygs | Ygs | 189,185,136 | Solid | Rodgers-1985 | Metaigneous rock | High | DMU030 | None
39 | None | Iapetos (Oceanic) Terrane | None | None | None | 01-02 | Heading2 | None | None | None | None | Rodgers-1985 | None | None | DMU031 | None
40 | None | Connecticut Valley Synclinorium | None | None | None | 01-02-01 | Heading3 | None | None | None | None | Rodgers-1985 | None | None | DMU032 | None
41 | None | Intrusive Rocks | None | None | None | 01-02-01-01 | Heading4 | None | None | None | None | Rodgers-1985 | None | None | DMU033 | None
42 | Pp | Porphyry (Dacite or Rhyolite) | Porphyry (Dacite or Rhyolite) | Permian | Light-colored, very fine grained, massive porphyry with phenocrysts of quartz, feldspar, and biotite; muscovite and accessory fluorite in ground mass | 01-02-01-01-01 | DMU1 | Pp | Pp | 255,105,180 | Solid | Rodgers-1985 | Fine-grained, felsic-composition intrusive igneous rock | High | DMU034 | None
43 | Ppa | Pinewood Adamellite | Pinewood Adamellite | Permian | Light-gray, medium-grained, massive adamellite, composed of microcline, albite, quartz, and muscovite with accessory fluorite. High radioactivity | 01-02-01-01-02 | DMU1 | Ppa | Ppa | 254,134,207 | Solid | Rodgers-1985 | Fine-grained, felsic-composition intrusive igneous rock | High | DMU035 | None
44 | Ps | Syenite | Syenite | Permian | Medium-gray, massive syenite, composed of microcline, amphibole (arfvedsonite), and biotite with accessory apatite and sphene | 01-02-01-01-03 | DMU1 | Ps | Ps | 179,122,157 | Solid | Rodgers-1985 | Coarse-grained, felsic-composition intrusive igneous rock | High | DMU036 | None
45 | Dng | Nonewaug Granite | Nonewaug Granite | Devonian | White to pink, fine- to very coarse grained (commonly pegmatitic), massive to layered granite composed of albite, microcline, quartz, and muscovite, with minor biotite and garnet. Microcline commonly graphic; quartz and muscovite commonly in plumose aggregates | 01-02-01-01-04 | DMU1 | Dng | Dng | 254,179,179 | Solid | Rodgers-1985 | Coarse-grained, felsic-composition intrusive igneous rock | High | DMU037 | None
46 | Dlp | Lamprophyre | Lamprophyre | Devonian? | Dark-gray to greenish, fine-grained, badly altered dike rock, composed of biotite, augite, K-feldspar, and accessory apatite and sphene, plus secondary minerals | 01-02-01-01-05 | DMU1 | Dlp | Dlp | 132,112,255 | Solid | Rodgers-1985 | Exotic-composition intrusive igneous rock | High | DMU038 | None
47 | Og | Ordovician? Granitic Gneiss | Ordovician? Granitic Gneiss | Middle Ordovician? | (Including local terms Ansonia, Mine Hill, "Tyler Lake," "Siscowit") White, light-gray, buff, or pink, generally foliated granitic gneiss, composed of sodic plagioclase, quartz, microcline, muscovite, and biotite, and locally garnet or sillimanite. Commonly contains numerous inclusions or layers of mica schist and gneiss | 01-02-01-01-06 | DMU1 | Og | Og | 254,223,223 | Solid | Rodgers-1985 | Meta-felsic and intermediate rock | High | DMU039 | None
48 | Og? | Ordovician? Granitic Gneiss | Ordovician? Granitic Gneiss | Middle Ordovician? | see Og (? denotes uncertain identification of the formation, with the most closely associated formation symbol used for the map unit). | 01-02-01-01-07 | DMU1 | Og? | Og? | 254,223,223 | Solid | Rodgers-1985 | Meta-felsic and intermediate rock | High | DMU040 | None
49 | Ol | Litchfield Norite | Litchfield Norite | Middle? Ordovician | Dark, medium- to coarse-grained, mostly massive mafic rock (olivine norite, quartz norite, hypersthene pyroxenite), composed of labradorite, hypersthene, augite, and olivine in varying proportions, also hornblende and biotite (and minor quartz in quartz norite). Associated with small mineral deposits of pyrrhotite, pentlandite, and chalcopyrite | 01-02-01-01-08 | DMU1 | Ol | Ol | 200,194,254 | Solid | Rodgers-1985 | Coarse-grained, mafic-composition intrusive igneous rock | High | DMU041 | None
50 | Ob | Brookfield (Dioritic and Granodioritic) Gneiss | Brookfield (Dioritic and Granodioritic) Gneiss | Middle? Ordovician | (Including Newtown Gneiss of Crowley, 1968) Dark and light, commonly speckled or banded, medium- to coarse-grained, massive to poorly foliated gneiss, composed of plagioclase, biotite, and hornblende, generally with quartz and K-feldspar, the latter commonly as megacrysts 1 to 3 cm across (also plagioclase megacrysts in darker rocks), locally associated with amphibolite or hornblende schist | 01-02-01-01-09 | DMU1 | Ob | Ob | 231,220,254 | Solid | Rodgers-1985 | Meta-felsic and intermediate rock | High | DMU042 | None
51 | u | Ultramafic Rock | Ultramafic Rock | Ordovician (or older) | Ultramafic rock, originally composed of olivine an pyroxene, now generally altered to tremolite, talc, chlorite, or serpentine | 01-02-01-01-10 | DMU1 | u | u | 122,080,206 | Solid | Rodgers-1985 | Ultramafic intrusive igneous rock | High | DMU043 | Note on legacy paper map this unit is also recorded under intrusive rocks of the Bronson Hill Anticlinorium, and could theoretically be placed there as well in this DMU. The duplicate unit has been removed for GeMS compliancy.
52 | None | Stratified Rocks | None | None | None | 01-02-01-02 | Heading4 | None | None | None | None | Rodgers-1985 | None | None | DMU044 | None
53 | None | Hartland Belt | None | None | None | 01-02-01-02-01 | Heading5 | None | None | None | None | Rodgers-1985 | None | None | DMU045 | None
54 | DSt | The Straits Schist | The Straits Schist | Devonian or Silurian or both | ( = Goshen Formation of Massachusetts) Silvery to gray, non-rusty, coarse- to very coarse grained, generally poorly layered schist, composed of quartz, muscovite, biotite, oligoclase, garnet, and commonly staurolite and kyanite or sillimanite; graphitic almost throughout | 01-02-01-02-01-01 | DMU1 | DSt | DSt | 255,215,000 | Solid | Rodgers-1985 | Schist and gneiss, of sedimentary-rock origin | High | DMU046 | None
55 | DSts | Southington Mountain Member of The Straits Schist | Southington Mountain Member of The Straits Schist | Devonian or Silurian or both | Gray to silvery, non-rusty, medium-grained, well-layered alternating schist and granofels, composed of quartz, oligoclase, muscovite, biotite, and garnet, commonly with staurolite and kyanite (or sillimanite); schist commonly graphitic | 01-02-01-02-01-01-01 | DMU2 | DSts | DSts | 254,243,080 | Solid | Rodgers-1985 | Schist and gneiss, of sedimentary-rock origin | High | DMU047 | None
56 | Stb | Basal Member of the Straits Schist | Basal Member of the Straits Schist | Silurian | ( = Russell Mountain Formation of Massachusetts) Distinguished by presence of layers of amphibolite, marble, calc-silicate rock, and quartzite within more uniform schist like that on either side. Minor, unevenly distributed mineralization in W, Bi, Cu, Ni, and other metals | 01-02-01-02-01-01-02 | DMU2 | Stb | Stb | 255,165,000 | Solid | Rodgers-1985 | Schist and gneiss, of sedimentary-rock origin | High | DMU048 | None
57 | Otf | Trap Falls Formation | Trap Falls Formation | Middle or Lower Ordovician | (May be equivalent in part to Golden Hill Schist) Gray to silvery, partly rusty weathering, medium-grained, generally well layered schist, composed of quartz, sodic plagioclase, biotite, muscovite, and garnet, locally with sillimanite or kyanite, interlayered with two-mica gneiss and granulite and with amphibolite | 01-02-01-02-01-02 | DMU1 | Otf | Otf | 238,232,170 | Solid | Rodgers-1985 | Schist and gneiss, of sedimentary-rock origin | High | DMU049 | Part of the Hawley Formation and equivalent formations (includes Trap Falls and Cobble Mountain Formations)
58 | Otfc | Carringtons Pond Member of Trap Falls Formation | Carringtons Pond Member of Trap Falls Formation | Middle or Lower Ordovician | Interlayered medium- to dark-gray, rusty-weathering, medium-grained schist and light-gray, fine- to medium-grained gneiss, composed of quartz, sodic plagioclase, biotite, muscovite, and garnet; schist locally contains sillimanite or kyanite; gneiss locally contains K-feldspar; amphibolite layers common | 01-02-01-02-01-02-01 | DMU2 | Otfc | Otfc | 238,232,170 | Solid | Rodgers-1985 | Schist and gneiss, of sedimentary-rock origin | High | DMU050 | Part of the Hawley Formation and equivalent formations (includes Trap Falls and Cobble Mountain Formations)
59 | Otfs | Shelton (White Gneiss) Member of Trap Falls Formation | Shelton (White Gneiss) Member of Trap Falls Formation | Middle or Lower Ordovician | White, light-gray, or buff, fine- to medium-grained, generally well foliated granitic gneiss, composed of sodic plagioclase, quartz, microcline, muscovite, and garnet (in tiny almost ubiquitous grains), also commonly minor biotite; generally interlayered with mica schist, biotite gneiss, and calc-silicate rock. Thought to be metavolcanic equivalent of unit Og | 01-02-01-02-01-02-02 | DMU2 | Otfs | Otfs | 254,223,223 | Solid | Rodgers-1985 | Meta-felsic and intermediate rock | High | DMU051 | Part of the Hawley Formation and equivalent formations (includes Trap Falls and Cobble Mountain Formations)
60 | Otfg | Schist and Granulite Member of Trap Falls Formation | Schist and Granulite Member of Trap Falls Formation | Middle or Lower Ordovician | Interlayered gray to silvery, medium- to coarse-grained schist and fine-grained granofels, composed of quartz, sodic plagioclase, biotite, and muscovite; garnet common in schist | 01-02-01-02-01-02-03 | DMU2 | Otfg | Otfg | 238,232,170 | Solid | Rodgers-1985 | Schist and gneiss, of sedimentary-rock origin | High | DMU052 | Part of the Hawley Formation and equivalent formations (includes Trap Falls and Cobble Mountain Formations)
61 | Ocm | Cobble Mountain Formation | Cobble Mountain Formation | Middle Ordovician | Gray to silvery (not rusty), medium- to coarse-grained, generally layered schist and granofels, composed of quartz, oligoclase, muscovite, biotite, and garnet, and locally kyanite and staurolite or sillimanite. Some amphibolite layers | 01-02-01-02-01-03 | DMU1 | Ocm | Ocm | 238,232,170 | Solid | Rodgers-1985 | Schist and gneiss, of sedimentary-rock origin | High | DMU053 | Part of the Hawley Formation and equivalent formations (includes Trap Falls and Cobble Mountain Formations)
62 | Ohc | Hawley Formation (Carbonaceous Schist Facies) | Hawley Formation (Carbonaceous Schist Facies) | Middle Ordovician | Gray, rusty-weathering, fine- to medium-grained, generally layered schist and granofels, composed of quartz, oligoclase, and biotite; some muscovite and graphite, rare garnet and kyanite or sillimanite. Layers of quartz-spessartine rock (coticule) common | 01-02-01-02-01-04 | DMU1 | Ohc | Ohc | 032,178,170 | Solid | Rodgers-1985 | Schist and gneiss, of sedimentary-rock origin | High | DMU054 | Part of the Hawley Formation and equivalent formations (includes Trap Falls and Cobble Mountain Formations)
63 | Oh | Harrison Gneiss | Harrison Gneiss | Middle? Ordovician | (Including Prospect Gneiss) Interlayered dark- and light-gray, medium-grained, well-foliated gneiss, composed of andesine, quartz, hornblende, and biotite (also locally K-feldspar as megacrysts 1 to 5 cm long). Thought to be metavolcanic equivalent of unit Ob | 01-02-01-02-01-05 | DMU1 | Oh | Oh | 231,220,254 | Solid | Rodgers-1985 | Meta-felsic and intermediate rock | High | DMU055 | None
64 | Ohp | Pumpkin Ground (porphyritic) Member of Harrison (Prospect) Gneiss | Pumpkin Ground (porphyritic) Member of Harrison (Prospect) Gneiss | Middle? Ordovician | Medium- to light-gray, medium- to coarse-grained, well-layered and foliated gneiss, composed of oligoclase, microcline, quartz, and biotite; some layers have numerous microcline megacrysts 1 to 5 cm across; others have hornblende. Minor layers of garnetiferous schist and gneiss | 01-02-01-02-01-05-01 | DMU2 | Ohp | Ohp | 229,174,254 | Solid | Rodgers-1985 | Meta-felsic and intermediate rock | High | DMU056 | None
65 | Ohb | Beardsley (hornblendic) Member of Harrison (Prospect) Gneiss | Beardsley (hornblendic) Member of Harrison (Prospect) Gneiss | Middle? Ordovician | Medium- to dark-gray, medium-grained, well-layered and lineated gneiss, composed of plagioclase, quartz, microcline, hornblende, biotite, and epidote. Microcline may occur as megacrysts 1 to 3 cm across. Minor layers of garnetiferous schist and rarely of calc-silicate rock or marble | 01-02-01-02-01-05-02 | DMU2 | Ohb | Ohb | 231,220,254 | Solid | Rodgers-1985 | Meta-mafic rock | High | DMU057 | None
66 | Ohn | Nodular Member of Harrison Gneiss | Nodular Member of Harrison Gneiss | Middle? Ordovician | Harrison Gneiss containing prominent quartz-sillimanite nodules | 01-02-01-02-01-05-03 | DMU2 | Ohn | Ohn | 176,196,222 | Solid | Rodgers-1985 | Meta-felsic and intermediate rock | High | DMU058 | None
67 | Oh? | Harrison Gneiss | Harrison Gneiss | Middle? Ordovician | see Oh (? denotes uncertain identification of the formation, with the most closely associated formation symbol used for the map unit). | 01-02-01-02-01-06 | DMU1 | Oh? | Oh? | 231,220,254 | Solid | Rodgers-1985 | Meta-felsic and intermediate rock | High | DMU059 | None
68 | Ogh | Golden Hill Schist | Golden Hill Schist | Lower? Ordovician | (May be equivalent to part of Trap Falls Formation) Gray to silvery, medium- to coarse-grained, generally layered schist and granofels, composed of quartz, muscovite, biotite, plagioclase, and garnet | 01-02-01-02-01-07 | DMU1 | Ogh | Ogh | 194,254,194 | Solid | Rodgers-1985 | Schist and gneiss, of sedimentary-rock origin | High | DMU060 | Equivalents of Savoy Schist of Massachusetts (Emerson, 1898, 1917) and of Moretown Formation of Vermont and Massachusetts (Bedrock Geologic Map of Massachusetts, Zen and others, 1983) (includes Golden Hill and Ratlum Mountain Schist)
69 | Ogh? | Golden Hill Schist | Golden Hill Schist | Lower? Ordovician | see Ogh (? denotes uncertain identification of the formation, with the most closely associated formation symbol used for the map unit). | 01-02-01-02-01-08 | DMU1 | Ogh? | Ogh? | 194,254,194 | Solid | Rodgers-1985 | Schist and gneiss, of sedimentary-rock origin | High | DMU061 | Equivalents of Savoy Schist of Massachusetts (Emerson, 1898, 1917) and of Moretown Formation of Vermont and Massachusetts (Bedrock Geologic Map of Massachusetts, Zen and others, 1983) (includes Golden Hill and Ratlum Mountain Schist)
70 | Or | Ratlum Mountain Schist | Ratlum Mountain Schist | Lower? Ordovician | Gray, medium-grained, interlayered schist and granofels, composed of quartz, oligoclase, muscovite (in the schist), biotite, and garnet, also staurolite and kyanite in the schist. Numerous layers and lenses of amphibolites; also some of quartz-spessartine (coticule) and calc-silicate rock. | 01-02-01-02-01-09 | DMU1 | Or | Or | 194,254,194 | Solid | Rodgers-1985 | Schist and gneiss, of sedimentary-rock origin | High | DMU062 | Equivalents of Savoy Schist of Massachusetts (Emerson, 1898, 1917) and of Moretown Formation of Vermont and Massachusetts (Bedrock Geologic Map of Massachusetts, Zen and others, 1983) (includes Golden Hill and Ratlum Mountain Schist)
71 | Ora | Amphibolite unit in Ratlum Mountain Schist | Amphibolite unit in Ratlum Mountain Schist | Lower? Ordovician | Black or mottled, generally massive amphibolite and hornblende gneiss, composed of hornblende and andesine, commonly with minor quartz and magnetite, and locally with garnet, biotite, and epidote. | 01-02-01-02-01-09-01 | DMU2 | Ora | Ora | 255,135,000 foreground; 194,254,194 background | Randomly placed and oriented "v"s over a solid background | Rodgers-1985 | Meta-mafic rock | High | DMU063 | Equivalents of Savoy Schist of Massachusetts (Emerson, 1898, 1917) and of Moretown Formation of Vermont and Massachusetts (Bedrock Geologic Map of Massachusetts, Zen and others, 1983) (includes Golden Hill and Ratlum Mountain Schist)
72 | Or? | Ratlum Mountain Schist | Ratlum Mountain Schist | Lower? Ordovician | see Or (? denotes uncertain identification of the formation, with the most closely associated formation symbol used for the map unit). | 01-02-01-02-01-10 | DMU1 | Or? | Or? | 194,254,194 | Solid | Rodgers-1985 | Schist and gneiss, of sedimentary-rock origin | High | DMU064 | Equivalents of Savoy Schist of Massachusetts (Emerson, 1898, 1917) and of Moretown Formation of Vermont and Massachusetts (Bedrock Geologic Map of Massachusetts, Zen and others, 1983) (includes Golden Hill and Ratlum Mountain Schist)
73 | Or+Ora | Ratlum Mountain Schist and Amphibolite unit in Ratlum Mountain Schist undivided | Ratlum Mountain Schist and Amphibolite unit in Ratlum Mountain Schist undivided | Lower? Ordovician | see Or and Ora | 01-02-01-02-01-11 | DMU1 | Or+Ora | Or+Ora | 255,135,000 foreground; 194,254,194 background | Randomly placed and oriented "v"s over a solid background | Rodgers-1985 | Metamorphic rock | High | DMU065 | Equivalents of Savoy Schist of Massachusetts (Emerson, 1898, 1917) and of Moretown Formation of Vermont and Massachusetts (Bedrock Geologic Map of Massachusetts, Zen and others, 1983) (includes Golden Hill and Ratlum Mountain Schist)
74 | OCr | Rowe Schist | Rowe Schist | Lower Ordovician or Cambrian or both | Light-gray to silvery, fine- to medium-grained, generally poorly layered schist, composed of quartz, muscovite, biotite, oligoclase, and generally garnet, staurolite, and kyanite or sillimanite. Layers of granofels common; also some layers of amphibolite, quartz spessartine rock (coticule), and calc-silicate rock. | 01-02-01-02-01-12 | DMU1 | O_r | OCr | 124,166,152 | Solid | Rodgers-1985 | Schist and gneiss, of sedimentary-rock origin | High | DMU066 | None
75 | OCra | Amphibolite Unit in Rowe Schist | Amphibolite Unit in Rowe Schist | Lower Ordovician or Cambrian or both | Black or mottled, generally massive amphibolite and hornblende gneiss, composed of hornblende and andesine | 01-02-01-02-01-12-01 | DMU2 | O_ra | OCra | 124,166,152 | Solid | Rodgers-1985 | Meta-mafic rock | High | DMU067 | None
76 | OCr? | Rowe Schist | Rowe Schist | Lower Ordovician or Cambrian or both | see OCr (? denotes uncertain identification of the formation, with the most closely associated formation symbol used for the map unit). | 01-02-01-02-01-13 | DMU1 | O_r? | OCr? | 124,166,152 | Solid | Rodgers-1985 | Schist and gneiss, of sedimentary-rock origin | High | DMU068 | None
77 | OCr+OCra | Rowe Schist | Rowe Schist and Amphibolite unit in Rowe Schist undivided | Lower Ordovician or Cambrian or both | see OCr and OCra | 01-02-01-02-01-14 | DMU1 | O_r+O_ra | OCr+OCra | 255,135,000 foreground; 124,166,152 background | Randomly placed and oriented "v"s over a solid background | Rodgers-1985 | Metamorphic rock | High | DMU069 | None
78 | None | Gneiss Dome Belt | None | None | None | 01-02-01-02-02 | Heading5 | None | None | None | None | Rodgers-1985 | None | None | DMU070 | None
79 | Oc | Collinsville Formation | Collinsville Formation | Middle Ordovician | Mixture of rock types as described for the two members; in many areas felsic and mafic striped metavolcanic rocks predominate | 01-02-01-02-02-01 | DMU1 | Oc | Oc | 214,220,185 | Solid | Rodgers-1985 | Metaigneous rock | High | DMU071 | Hawley Formation and equivalent formations (includes Collinsville Formation)
80 | Ocs | Sweetheart Mountain Member | Sweetheart Mountain Member of Collinsville Formation | Middle Ordovician | Gray and silvery (not rusty), medium- to coarse-grained, poorly layered schist, composed of quartz, oligoclase, biotite, muscovite, and garnet, and in places kyanite or sillimanite. Amphibolite layers common; also layers of quartz-spessartine rock (coticule) | 01-02-01-02-02-01-01 | DMU2 | Ocs | Ocs | 238,232,170 | Solid | Rodgers-1985 | Metamorphic rock | High | DMU072 | Hawley Formation and equivalent formations (includes Collinsville Formation)
81 | Ocg | Hornblende Gneiss Member of Collinsville Formation | Hornblende Gneiss Member of Collinsville Formation | Middle Ordovician | Dark, fine- to medium-grained, well-layered amphibolite and hornblende gneiss, composed or hornblende and plagioclase, commonly with biotite, garnet, or epidote, interlayered with light-gray felsic gneiss and pink quartz-spessartine rock (coticule). Grades into Bristol Gneiss | 01-02-01-02-02-01-02 | DMU2 | Ocg | Ocg | 214,220,185 | Solid | Rodgers-1985 | Metamorphic rock | High | DMU073 | Hawley Formation and equivalent formations (includes Collinsville Formation)
82 | Ot+Oc | Taine Mountain and Collinsville Formations undivided | Taine Mountain and Collinsville Formations undivided | Ordovician | See Ot and Oc | 01-02-01-02-02-02 | DMU1 | Ot+Oc | Ot+Oc | 194,254,194 lines; 214,220,185 background | Vertical lines 2 pts thick, separation: 5 pts over a solid background | Rodgers-1985 | Metaigneous rock | High | DMU074 | Includes equivalents of Savoy Schist of Massachusetts, Moretown Formation of Vermont and Massachusetts (includes Taine Mountain Formation), and Hawley Formation and equivalent formations (includes Collinsville Formation). Mixed metased and metaig.
83 | Obs | Bristol Gneiss | Bristol Gneiss | Middle? Ordovician | Light, medium-grained, massive to well-layered gneiss, composed of plagioclase, quartz, and biotite, also muscovite and garnet in many layers, interlayered in places with dark amphibolite | 01-02-01-02-02-03 | DMU1 | Obs | Obs | 254,223,223 | Solid | Rodgers-1985 | Meta-felsic and intermediate rock | High | DMU075 | None
84 | Ot | Taine Mountain Formation | Taine Mountain Formation | Lower? Ordovician | Gray, medium-grained, generally fairly well layered to well-laminated ('pin-stripe') gneissic or schistose granofels, composed of quartz, oligoclase, biotite, muscovite, and garnet, and locally staurolite and kyanite or sillimanite | 01-02-01-02-02-04 | DMU1 | Ot | Ot | 194,254,194 | Solid | Rodgers-1985 | Schist and gneiss, of sedimentary-rock origin | High | DMU076 | Equivalents of Savoy Schist of Massachusetts (Emerson 1898, 1917) and of Moretown Formation of Vermont and Massachusetts (Bedrock Geologic Map of Massachusetts, Zen and others, 1983) (includes Taine Mountain Formation)
85 | Otwv | Whigville Member | Whigville Member of Taine Mountain Formation | Lower? Ordovician | Gray, medium-grained, generally fairly well layered to well-laminated ('pin-stripe') gneissic or schistose granofels, composed of quartz, oligoclase, biotite, muscovite, and garnet, and locally staurolite and kyanite or sillimanite | 01-02-01-02-02-04-01 | DMU2 | Otwv | Otwv | 194,254,194 | Solid | Rodgers-1985 | Schist and gneiss, of sedimentary-rock origin | High | DMU077 | Equivalents of Savoy Schist of Massachusetts (Emerson 1898, 1917) and of Moretown Formation of Vermont and Massachusetts (Bedrock Geologic Map of Massachusetts, Zen and others, 1983) (includes Taine Mountain Formation)
86 | Ots | Scranton Mountain Member | Scranton Mountain Member of Taine Mountain Formation | Lower? Ordovician | Gray, rusty-weathering, medium-grained schist, composed of quartz, muscovite, biotite, plagioclase, garnet, and generally kyanite | 01-02-01-02-02-04-02 | DMU2 | Ots | Ots | 124,166,152 | Solid | Rodgers-1985 | Schist and gneiss, of sedimentary-rock origin | High | DMU078 | Equivalents of Savoy Schist of Massachusetts (Emerson 1898, 1917) and of Moretown Formation of Vermont and Massachusetts (Bedrock Geologic Map of Massachusetts, Zen and others, 1983) (includes Taine Mountain Formation)
87 | Otw | Wildcat Member | Wildcat Member of Taine Mountain Formation | Lower? Ordovician | Gray, medium-grained, generally fairly well layered to well-laminated ('pin-stripe') gneissic or schistose granofels, composed of quartz, oligoclase, biotite, muscovite, and garnet, and locally staurolite and kyanite or sillimanite | 01-02-01-02-02-04-03 | DMU2 | Otw | Otw | 194,254,194 | Solid | Rodgers-1985 | Schist and gneiss, of sedimentary-rock origin | High | DMU079 | Equivalents of Savoy Schist of Massachusetts (Emerson 1898, 1917) and of Moretown Formation of Vermont and Massachusetts (Bedrock Geologic Map of Massachusetts, Zen and others, 1983) (includes Taine Mountain Formation)
88 | Otb | Basal Member of Taine Mountain Formation around Waterbury Dome | Basal Member of Taine Mountain Formation around Waterbury Dome | Lower? Ordovician | Differs from rest of Taine Mountain Formation in being especially well layered and generally less micaceous and schistose | 01-02-01-02-02-04-04 | DMU2 | Otb | Otb | 124,166,152 | Solid | Rodgers-1985 | Schist and gneiss, of sedimentary-rock origin | High | DMU080 | Equivalents of Savoy Schist of Massachusetts (Emerson 1898, 1917) and of Moretown Formation of Vermont and Massachusetts (Bedrock Geologic Map of Massachusetts, Zen and others, 1983) (includes Taine Mountain Formation)
89 | Cwb | Waterbury Gneiss | Waterbury Gneiss | Proterozoic Z or Cambrian or both | Medium- to dark-gray, fine- to medium-grained, generally irregularly foliated and lenticular rather than regularly layered schist and schistose gneiss, composed of biotite, quartz, oligoclase, kyanite (or sillimanite), and garnet, also locally microcline, irregularly mixed with granitoid gneiss, composed of oligoclase or andesine, quartz, biotite, and commonly microcline and muscovite | 01-02-01-02-02-05 | DMU1 | _wb | Cwb | 223,209,000 | Solid | Rodgers-1985 | Metamorphic rock | High | DMU081 | None
90 | None | Orange Milford Belt | None | None | None | 01-02-01-02-03 | Heading5 | None | None | None | None | Rodgers-1985 | None | None | DMU082 | None
91 | DSw | Wepawaug Schist | Wepawaug Schist | Devonian or Silurian or both | Medium- to dark-gray, medium- to fine-grained, well-layered schist or phyllite and metasiltstone, composed of quartz, muscovite or sericite, plagioclase, biotite, and in appropriate metamorphic zones chlorite, garnet, staurolite, and kyanite. Schist or phyllite generally graphitic | 01-02-01-02-03-01 | DMU1 | DSw | DSw | 254,243,080 | Solid | Rodgers-1985 | Schist and gneiss, of sedimentary-rock origin | High | DMU083 | None
92 | Oma | Maltby Lakes Metavolcanics | Maltby Lakes Metavolcanics | Middle? Ordovician | Green to gray-green, fine-grained, massive to well-foliated and layered greenstone, greenschist, and schist; also dark amphibolite to west and southwest | 01-02-01-02-03-02 | DMU1 | Oma | Oma | 255,135,000 foreground; 214,220,185 background | Randomly placed and oriented "v"s over a solid background | Rodgers-1985 | Meta-mafic rock | High | DMU084 | None
93 | Omau | Maltby Lakes Metavolcanics | Upper Part of Maltby Lakes Metavolcanics | Middle? Ordovician | Green to gray-green, fine-grained, layered and foliated to massive greenstone and greenschist, composed of epidote, albite, actinolite, and chlorite, and locally minor quartz, sericite, garnet, pyrite, or calcite. Mainly metavolcanic | 01-02-01-02-03-02-01 | DMU2 | Omau | Omau | 214,220,185 | Solid | Rodgers-1985 | Meta-mafic rock | High | DMU085 | None
94 | Omal | Maltby Lakes Metavolcanics | Lower Part of Maltby Lakes Metavolcanics | Middle? Ordovician | Gray-green to green, fine-grained, generally well foliated greenschist, greenstone, and schist or phyllite, composed of albite and chlorite, plus quartz and sericite or epidote and actinolite, mixed metavolcanic and metasedimentary rocks | 01-02-01-02-03-02-02 | DMU2 | Omal | Omal | 238,232,170 | Solid | Rodgers-1985 | Meta-mafic rock | High | DMU086 | None
95 | Oa+Oma | Allingtown Metavolcanics and Maltby Lakes Metavolcanics undivided | Allingtown Metavolcanics and Maltby Lakes Metavolcanics undivided | Middle? Ordovician | see Oa and Oma | 01-02-01-02-03-03 | DMU1 | Oa+Oma | Oa+Oma | 255,135,000 foreground; 231,220,254 background | Randomly placed and oriented "v"s over a solid background | Rodgers-1985 | Meta-mafic rock | High | DMU087 | None
96 | Oa | Allingtown Metavolcanics | Allingtown Metavolcanics | Middle? Ordovician | Green, fine-grained, massive greenstone, composed of epidote, actinolite, albite, and chlorite, commonly with abundant megacrysts of saussurite, interlayered with minor green phyllite, generally containing quartz and sericite. Dark amphibole in western outcrops | 01-02-01-02-03-04 | DMU1 | Oa | Oa | 231,220,254 | Solid | Rodgers-1985 | Meta-mafic rock | High | DMU088 | None
97 | Oo | Oronoque Schist | Oronoque Schist | Lower? Ordovician | Gray to silver, medium- to fine-grained, well-layered to laminated schist and granofels, composed of quartz, oligoclase or albite, muscovite or sericite, biotite or chlorite, and in western belt local garnet, staurolite, and kyanite. Small lenses of amphibolite or greenstone | 01-02-01-02-03-05 | DMU1 | Oo | Oo | 194,254,194 | Solid | Rodgers-1985 | Schist and gneiss, of sedimentary-rock origin | High | DMU089 | Equivalents of Savoy Schist of Massachusetts (Emerson 1898, 1917) and of Moretown Formation of Vermont and Massachusetts (Bedrock Geologic Map of Massachusetts, Zen and others, 1983) (includes Oronoque Schist)
98 | None | Intrusive and Stratified Rocks | None | None | None | 01-02-01-03 | Heading4 | None | None | None | None | Rodgers-1985 | None | None | DMU090 | None
99 | Otf+Og | Trap Falls Formation and Ordovician? Granitic Gneiss undivided | Trap Falls Formation and Ordovician? Granitic Gneiss undivided | Ordovician | See Otf and Og | 01-02-01-03-01 | DMU1 | Otf+Og | Otf+Og | 255,135,000 foreground; 226,254,095 background | Columns of +'s or *'s over a solid background. Every other column's markers are offset from the previous by a few points, so they don't also form uniform rows, but diagonal lines as well. | Rodgers-1985 | Metamorphic rock | High | DMU091 | Includes part of the Hawley Formation and equivalent formations (includes Trap Falls and Cobble Mountain Formations)
100 | None | Central Lowlands | None | None | None | 02 | Heading1 | None | None | None | None | Rodgers-1985 | None | None | DMU092 | None
101 | None | Newark Terrane | None | None | None | 02-01 | Heading2 | None | None | None | None | Rodgers-1985 | None | None | DMU093 | None
102 | None | Hartford and Pomperaug Mesozoic Basins | None | None | None | 02-01-01 | Heading3 | None | None | None | None | Rodgers-1985 | None | None | DMU094 | Note on legacy paper map the Pomperaug Basin is in the Western Uplands, and should be placed there in this DMU. Since both basins share the same units and duplicate units violate GeMS compliance, the units are only recorded here under Central Lowlands.
103 | None | Intrusive Rocks | None | None | None | 02-01-01-01 | Heading4 | None | None | None | None | Rodgers-1985 | None | None | DMU095 | None
104 | Jb | Buttress Dolerite | Buttress Dolerite | Middle? Jurassic | Dark-gray to greenish-gray (weathers brown or gray), medium- to fine-grained, commonly porphyritic, generally massive with well-developed columnar jointing, grading from basalt near contacts to fine-grained gabbro in the interior, composed of plagioclase and pyroxene with accessory opaques and locally devitrified glass, quartz, or olivine | 02-01-01-01-01 | DMU1 | Jb | Jb | 229,000,000 | Solid | Rodgers-1985 | Fine-grained, mafic-composition intrusive igneous rock | High | DMU096 | None
105 | Jb? | Buttress Dolerite | Buttress Dolerite | Middle? Jurassic | see Jb (? denotes uncertain identification of the formation, with the most closely associated formation symbol used for the map unit). | 02-01-01-01-02 | DMU1 | Jb? | Jb? | 229,000,000 | Solid | Rodgers-1985 | Fine-grained, mafic-composition intrusive igneous rock | High | DMU097 | None
106 | Jwr | West Rock Dolerite | West Rock Dolerite | Lower Jurassic | Dark-gray to greenish-gray (weathers bright orange to brown), medium- to fine-grained, grading from basalt near contacts to fine-grained gabbro in the interior, generally massive with well-developed columnar jointing, composed of plagioclase and pyroxene with accessory opaques and locally devitrified glass, quartz, or olivine | 02-01-01-01-03 | DMU1 | Jwr | Jwr | 250,128,114 | Solid | Rodgers-1985 | Fine-grained, mafic-composition intrusive igneous rock | High | DMU098 | None
107 | Jwr? | West Rock Dolerite | West Rock Dolerite | Lower Jurassic | see Jwr (? denotes uncertain identification of the formation, with the most closely associated formation symbol used for the map unit). | 02-01-01-01-04 | DMU1 | Jwr? | Jwr? | 250,128,114 | Solid | Rodgers-1985 | Fine-grained, mafic-composition intrusive igneous rock | High | DMU099 | None
108 | None | Stratified Rocks | None | None | None | 02-01-01-02 | Heading4 | None | None | None | None | Rodgers-1985 | None | None | DMU100 | None
109 | None | Newark Supergroup | None | None | None | 02-01-01-02-01 | Heading5 | None | None | None | None | Rodgers-1985 | None | None | DMU101 | None
110 | Jp | Portland Arkose | Portland Arkose | Lower Jurassic | Reddish-brown to maroon micaceous arkose and siltstone and red to black fissile silty shale. Grades eastward into coarse conglomerate (fanglomerate) | 02-01-01-02-01-01 | DMU1 | Jp | Jp | 254,251,220 | Solid | Rodgers-1985 | Sandstone and mudstone | High | DMU102 | None
111 | Jha | Hampden Basalt | Hampden Basalt | Lower Jurassic | Greenish-gray to black (weathers bright orange to brown), fine- to medium-grained, grading from basalt near contacts to fine-grained gabbro in the interior, composed of pyroxene and plagioclase with accessory opaques and locally olivine or devitrified glass | 02-01-01-02-01-02 | DMU1 | Jha | Jha | 255,199,174 | Solid | Rodgers-1985 | Mafic-composition lava flows | High | DMU103 | "Meriden Formation" of Krynine (1950).
112 | Jeb | East Berlin Formation | East Berlin Formation | Lower Jurassic | Maroon siltstone, silty and sandy shale, and fine-grained silty sandstone, generally well laminated and commonly well indurated, alternating with dark fissile shale; dolomitic carbonate common in cement, concretions, and thin argillaceous laminae. Local arkose; grades eastward into coarse conglomerate close to eastern border fault | 02-01-01-02-01-03 | DMU1 | Jeb | Jeb | 255,228,181 | Solid | Rodgers-1985 | Sandstone and mudstone | High | DMU104 | "Meriden Formation" of Krynine (1950).
113 | Jho | Holyoke Basalt | Holyoke Basalt | Lower Jurassic | Greenish-gray to black (weathers bright orange to brown), fine- to coarse-grained, grading from basalt near contacts to gabbro in the interior, composed of pyroxene and plagioclase with accessory opaques and locally olivine or devitrified glass | 02-01-01-02-01-04 | DMU1 | Jho | Jho | 250,128,114 | Solid | Rodgers-1985 | Mafic-composition lava flows | High | DMU105 | "Meriden Formation" of Krynine (1950).
114 | Jsm | Shuttle Meadow Formation | Shuttle Meadow Formation | Lower Jurassic | Maroon to dark-gray, silty shale, siltstone, and fine-grained silty sandstone, generally well and thinly laminated. In the southern part of the State includes a layer, up to 5 m thick, of blue, commonly sandy, fine-grained limestone or dolomitic limestone, grading laterally into calcareous siltstone. Coarser and more arkosic to east and south, grading into conglomerate near the eastern border fault. | 02-01-01-02-01-05 | DMU1 | Jsm | Jsm | 254,246,129 | Solid | Rodgers-1985 | Sandstone and mudstone | High | DMU106 | "Meriden Formation" of Krynine (1950).
115 | Jta | Talcott Basalt | Talcott Basalt | Lower Jurassic | Greenish-gray to black (weathers bright orange to brown), fine- to medium-grained, grading from basalt near contacts to fine-grained gabbro in the interior, composed of pyroxene and plagioclase with accessory opaques and locally olivine or devitrified glass. Pillows in many places; volcanic breccia with fragmentary pillows in others | 02-01-01-02-01-06 | DMU1 | Jta | Jta | 255,000,000 | Solid | Rodgers-1985 | Mafic-composition lava flows | High | DMU107 | "Meriden Formation" of Krynine (1950).
116 | TRnh | New Haven Arkose | New Haven Arkose | Upper Triassic; possibly Lower Jurassic at top | Red, pink, and gray coarse-grained, locally conglomeratic, poorly sorted and indurated arkose, interbedded with brick-red micaceous, locally slaty siltstone and fine-grained feldspathic clayey sandstone | 02-01-01-02-01-07 | DMU1 | ^nh | TRnh | 255,240,245 | Solid | Rodgers-1985 | Mostly sandstone | High | DMU108 | None
117 | None | Intrusive and Stratified Rocks | None | None | None | 02-01-01-03 | Heading4 | None | None | None | None | Rodgers-1985 | None | None | DMU109 | None
118 | TRnh+Jb | New Haven Arkose and Buttress Dolerite undivided | New Haven Arkose and Buttress Dolerite undivided | Triassic and Jurassic | See TRnh and Jb | 02-01-01-03-01 | DMU1 | ^nh+Jb | TRnh+Jb | 229,000,000 lines; 255,240,245 background | Vertical lines 1 pt thick, separation: 5 pts over a solid background | Rodgers-1985 | Fine-grained, mafic-composition intrusive igneous rock | High | DMU110 | GeoMaterial note- these are dikes
119 | None | Eastern Uplands | None | None | None | 03 | Heading1 | None | None | None | None | Rodgers-1985 | None | None | DMU111 | None
120 | None | Fault-Related Rocks | None | None | None | 03-01 | Heading4 | None | None | None | None | Rodgers-1985 | None | None | DMU112 | None
121 | Jsi | Silicified Rock and Mylonite along Mesozoic Faults | Silicified Rock and Mylonite along Mesozoic Faults | Probably mainly Jurassic | Close network of quartz veins and veinlets cutting each other and older rock, which is mostly replaced by very fine grained quartz. In places, incompletely replaced rock shows strongly mylonitic texture. | 03-01-01 | DMU1 | Jsi | Jsi | 255,105,180 | Solid | Rodgers-1985 | Deformation-related metamorphic rock | High | DMU113 | GeoMaterial note- these are massive quartz veins along faults
122 | Pzmy | Mylonite Along Paleozoic Faults | Mylonite Along Paleozoic Faults | Upper or Middle Paleozoic | Mylonite, blastomylonite, and blastomylonitic gneiss, composed of intensely granulated quartz, plagioclase, biotite, and epidote, in places with hornblende or microcline and commonly with secondary minerals. In places has later been silicified (compare unit Jsi) | 03-01-02 | DMU1 | |my | Pzmy | 177,186,132 | Solid | Rodgers-1985 | Deformation-related metamorphic rock | High | DMU114 | None
123 | None | Iapetos (Oceanic) Terrane | None | None | None | 03-02 | Heading2 | None | None | None | None | Rodgers-1985 | None | None | DMU115 | None
124 | None | Bronson Hill Anticlinorium | None | None | None | 03-02-01 | Heading3 | None | None | None | None | Rodgers-1985 | None | None | DMU116 | None
125 | None | Intrusive Rocks | None | None | None | 03-02-01-01 | Heading4 | None | None | None | None | Rodgers-1985 | None | None | DMU117 | None
126 | Dm | Maromas Granite Gneiss | Maromas Granite Gneiss | Devonian? | Light-gray to buff, medium- to fine-grained granitic gneiss, composed of quartz and microcline with minor plagioclase and biotite. Central body is massive, but outlying strips are foliated and have accessory hornblende or garnet. Massive parts may be young anatectic intrusive rocks; foliated parts may include older felsic metavolcanic rocks belonging to unit Ochv. Pegmatite bodies are common in the vicinity | 03-02-01-01-01 | DMU1 | Dm | Dm | 254,179,179 | Solid | Rodgers-1985 | Meta-felsic and intermediate rock | High | DMU118 | None
127 | Ogl | Glastonbury Gneiss | Glastonbury Gneiss | Middle? Ordovician | Gray, medium- to coarse-grained, massive to well-foliated granitoid gneiss composed of oligoclase, quartz, microcline, and biotite, (as patches), also epidote and hornblende in many areas, commonly associated with layers of amphibolite; elsewhere minor muscovite and garnet | 03-02-01-01-02 | DMU1 | Ogl | Ogl | 233,150,122 | Solid | Rodgers-1985 | Meta-felsic and intermediate rock | High | DMU119 | None
128 | Omm | Massive Mafic Rock in Middletown Formation | Massive Mafic Rock in Middletown Formation | Middle Ordovician | Dark, coarse-grained, massive amphibolite and metagabbro, composed of hornblende and plagioclase; in places with quartz and epidote, in others with patches of actinolite or anthophyllite, chlorite, and epidote or garnet. May be intrusive | 03-02-01-01-03 | DMU1 | Omm | Omm | 200,194,254 | Solid | Rodgers-1985 | Meta-mafic rock | High | DMU120 | Note on legacy paper map this unit is also recorded under stratified rocks of the Bronson Hill Anticlinorium, and could theoretically be placed there as well in this DMU. The duplicate unit has been removed for GeMS compliancy.
129 | None | Stratified Rocks | None | None | None | 03-02-01-02 | Heading4 | None | None | None | None | Rodgers-1985 | None | None | DMU121 | None
130 | De | Erving Formation | Erving Formation | Devonian | Gray, medium-grained, well-foliated and generally well layered granofels and schist, composed of quartz, plagioclase, and biotite, also muscovite in schist, and accessory garnet and kyanite | 03-02-01-02-01 | DMU1 | De | De | 255,215,000 | Solid | Rodgers-1985 | Schist and gneiss, of sedimentary-rock origin | High | DMU122 | None
131 | Dbl | Littleton Formation | Littleton Formation | Devonian | Gray to silvery, generally non-rusty, medium-grained, massive to well-layered alternating schist and micaceous quartzite, composed of quartz, muscovite, biotite, garnet, and oligoclase, also staurolite, graphite, and ilmenite, and in certain areas kyanite or sillimanite in schist | 03-02-01-02-02 | DMU1 | Dbl | Dbl | 254,243,080 | Solid | Rodgers-1985 | Schist and gneiss, of sedimentary-rock origin | High | DMU123 | Bolton Group
132 | Dblm | Mount Pisgah Member of Littleton Formation | Mount Pisgah Member of Littleton Formation | Devonian | Gray, medium-grained, well-layered (locally graded) granofels or micaceous quartzite with some schist, composed of quartz, oligoclase, biotite, garnet, and sillimanite | 03-02-01-02-02-01 | DMU2 | Dblm | Dblm | 254,243,080 | Solid | Rodgers-1985 | Schist and gneiss, of sedimentary-rock origin | High | DMU124 | Bolton Group
133 | Dbl? | Littleton Formation | Littleton Formation | Devonian | see Dbl (? denotes uncertain identification of the formation, with the most closely associated formation symbol used for the map unit). | 03-02-01-02-03 | DMU1 | Dbl? | Dbl? | 254,243,080 | Solid | Rodgers-1985 | Schist and gneiss, of sedimentary-rock origin | High | DMU125 | Bolton Group
134 | Sbf | Fitch Formation | Fitch Formation | Silurian | Gray, fine- to medium-grained calc-silicate rock, composed of quartz, biotite, calcite, actinolite, diopside, microcline, and locally garnet, scapolite, or epidote, interlayered with two-mica schist | 03-02-01-02-04 | DMU1 | Sbf | Sbf | 255,215,000 | Solid | Rodgers-1985 | Schist and gneiss, of sedimentary-rock origin | High | DMU126 | Bolton Group
135 | Sbc | Clough Quartzite | Clough Quartzite | Silurian | White, medium-grained, glassy to granular, well-layered quartzite and muscovitic quartzite, locally with garnet; conglomeratic (commonly with tourmaline) in lower part | 03-02-01-02-05 | DMU1 | Sbc | Sbc | 254,172,000 | Solid | Rodgers-1985 | Quartzite | High | DMU127 | Bolton Group
136 | Och | Collins Hill Formation | Collins Hill Formation | Upper? and Middle Ordovician | ( = Partridge Formation of New Hampshire) Gray, rusty-weathering, medium- to coarse-grained, poorly layered schist, composed of quartz, oligoclase, muscovite, biotite, and garnet, and commonly staurolite, kyanite, or sillimanite, generally graphitic, interlayered with fine-grained two-mica gneiss, especially to the west, and with calc-silicate and amphibolite layers, also rare quartz-spessartine (coticule) layers | 03-02-01-02-06 | DMU1 | Och | Och | 143,188,143 | Solid | Rodgers-1985 | Schist and gneiss, of sedimentary-rock origin | High | DMU128 | Brimfield Schist and equivalent formations (includes Collins Hill Formation)
137 | Ochv | Metavolcanic Member of Collins Hill Formation | Metavolcanic Member of Collins Hill Formation | Upper? and Middle Ordovician | Ranges from mafic to felsic, from dark layered amphibolite and hornblende schist, locally with garnet or epidote, to light-gray (in places purplish), laminated gneiss, composed of quartz, oligoclase, and biotite, in which some layers contain garnet (generally manganiferous) and hornblende or cummingtonite | 03-02-01-02-06-01 | DMU2 | Ochv | Ochv | 214,220,185 | Solid | Rodgers-1985 | Metaigneous rock | High | DMU129 | Brimfield Schist and equivalent formations (includes Collins Hill Formation)
138 | Om | Middletown Formation | Middletown Formation | Middle Ordovician | ( = Ammonoosuc Volcanics of New Hampshire) Heterogeneously interlayered dark- to light-gray, generally medium grained gneiss and granofels, ranging from quartz-biotite gneiss through felsic amphibolite gneiss to amphibolite and characteristically containing anthophyllite or cummingtonite with or without hornblende. Also layers of calc-silicate rock and of biotite gneiss with quartz-sillimanite nodules | 03-02-01-02-07 | DMU1 | Om | Om | 231,220,254 | Solid | Rodgers-1985 | Meta-mafic rock | High | DMU130 | None
139 | Omu | Upper member of Middletown Formation | Upper member of Middletown Formation | Middle Ordovician | Light-gray, generally rusty weathering, well-layered gneiss and granofels, composed of oligoclase, quartz, biotite, and amphibole (cummingtonite, anthophyllite, gedrite, or hornblende, or several of these), also garnet and chlorite. Many layers of amphibolite and biotite gneiss throughout | 03-02-01-02-07-01 | DMU2 | Omu | Omu | 216,191,216 | Solid | Rodgers-1985 | Metaigneous rock | High | DMU131 | None
140 | Oml | Lower member of Middletown Formation | Lower member of Middletown Formation | Middle Ordovician | Dark- to medium-gray amphibolite and hornblende gneiss, commonly with garnet, diopside, or epidote, interlayered with light-gray gneiss composed of oligoclase, quartz, biotite, and generally one or more amphiboles, also garnet | 03-02-01-02-07-02 | DMU2 | Oml | Oml | 231,220,254 | Solid | Rodgers-1985 | Metaigneous rock | High | DMU132 | None
141 | Om? | Middletown Formation | Middletown Formation | Middle Ordovician | see Om (? denotes uncertain identification of the formation, with the most closely associated formation symbol used for the map unit). | 03-02-01-02-08 | DMU1 | Om? | Om? | 231,220,254 | Solid | Rodgers-1985 | Meta-mafic rock | High | DMU133 | None
142 | Omo | Monson Gneiss | Monson Gneiss | Middle or Lower Ordovician? | (May be equivalent to part of Waterford Group) Interlayered light to dark, mostly medium to coarse-grained gneiss and amphibolite; gneiss composed of plagioclase, quartz and biotite, with hornblende in some layers and microcline in others; traces of garnet, epidote, and magnetite | 03-02-01-02-09 | DMU1 | Omo | Omo | 255,158,015 lines; 254,190,000 background | Right down diagonal lines 1 pt thick, separation: 3 pts, angle: 135 degrees. Over solid background. | Rodgers-1985 | Metamorphic rock | High | DMU134 | None
143 | None | Merrimack Synclinorium | None | None | None | 03-02-02 | Heading3 | None | None | None | None | Rodgers-1985 | None | None | DMU135 | None
144 | None | Stratified Rocks | None | None | None | 03-02-02-01 | Heading4 | None | None | None | None | Rodgers-1985 | None | None | DMU136 | None
145 | DSs | Scotland Schist | Scotland Schist | Devonian or Silurian or both | Gray to silvery, locally rusty, fine- to medium-grained schist, composed of quartz, muscovite, biotite, staurolite, and oligoclase, locally with kyanite or sillimanite; interlayered, especially below and to the west, with quartz-oligoclase-biotite schist and granofels and locally with quartzite | 03-02-02-01-01 | DMU1 | DSs | DSs | 254,243,080 | Solid | Rodgers-1985 | Schist and gneiss, of sedimentary-rock origin | High | DMU137 | None
146 | DSsq | Quartzite unit in Scotland Schist | Quartzite unit in Scotland Schist | Devonian or Silurian or both | Quartzite, generally micaceous, interlayered with mica schist | 03-02-02-01-01-01 | DMU2 | DSsq | DSsq | 254,172,000 | Solid | Rodgers-1985 | Quartzite | High | DMU138 | None
147 | None | Bigelow Brook Formation | Bigelow Brook Formation | None | None | 03-02-02-01-02 | DMU1 | None | None | None | None | Rodgers-1985 | None | None | DMU139 | None
148 | SObu | Upper Member of Bigelow Brook Formation | Upper Member of Bigelow Brook Formation | Silurian and perhaps Ordovician | Chiefly gray, rusty-weathering, medium-grained, generally well layered and locally fissile schist, composed of plagioclase, quartz, biotite, garnet, and sillimanite, locally with K-feldspar or cordierite, fissile layers commonly with graphite and pyrrhotite, interlayered with quartzose granofels with less biotite but with calc-silicate minerals | 03-02-02-01-02-01 | DMU2 | SObu | SObu | 146,174,047 | Solid | Rodgers-1985 | Schist and gneiss, of sedimentary-rock origin | High | DMU140 | Hebron Gneiss and equivalent formations (including equivalents of Paxton and Oakdale Formations of Massachusetts)
149 | SObm | Middle Member of Bigelow Brook Formation | Middle Member of Bigelow Brook Formation | Silurian and perhaps Ordovician | Greenish-gray, medium-grained calc-silicate rock, composed of plagioclase, quartz, and diopside (locally hornblende and scapolite), interbedded with schist and granofels composed of plagioclase, quartz, biotite, and commonly garnet and sillimanite | 03-02-02-01-02-02 | DMU2 | SObm | SObm | 226,254,095 | Solid | Rodgers-1985 | Schist and gneiss, of sedimentary-rock origin | High | DMU141 | Hebron Gneiss and equivalent formations (including equivalents of Paxton and Oakdale Formations of Massachusetts)
150 | SObl | Lower Member of Bigelow Brook Formation | Lower Member of Bigelow Brook Formation | Silurian or Ordovician or both | Chiefly gray, medium-grained, well-layered granofels, composed of quartz, oligoclase, and biotite, commonly with garnet and sillimanite, interlayered with thinly fissile sillimanitic, graphitic, pyrrhotitic biotite schist and with calc-silicate rock | 03-02-02-01-02-03 | DMU2 | SObl | SObl | 146,174,047 | Solid | Rodgers-1985 | Schist and gneiss, of sedimentary-rock origin | High | DMU142 | Hebron Gneiss and equivalent formations (including equivalents of Paxton and Oakdale Formations of Massachusetts)
151 | SOs | Southbridge Formation | Southbridge Formation | Silurian or Ordovician or both | Dark- to light-gray, locally rusty, fine- to medium-grained interlayered granofels and schist, composed of quartz, plagioclase, and biotite, with muscovite in schist and amphibole, calc-silicate minerals, or K-feldspar in certain layers; also locally mappable units and thinner layers of calc-silicate rock, amphibolite, and sillimanite-garnet and sillimanite-graphite-pyrrhotite schist | 03-02-02-01-03 | DMU1 | SOs | SOs | 226,254,095 | Solid | Rodgers-1985 | Schist and gneiss, of sedimentary-rock origin | High | DMU143 | Hebron Gneiss and equivalent formations (including equivalents of Paxton and Oakdale Formations of Massachusetts)
152 | SOsp | Porphyritic Member of Southbridge Formation | Porphyritic Member of Southbridge Formation | Silurian or Ordovician or both | Light-to medium-gray, fine-grained porphyritic massive to layered gneiss, composed of quartz, oligoclase, microcline, and biotite, with megacrysts 1 to 2 cm long of microcline | 03-02-02-01-03-01 | DMU2 | SOsp | SOsp | 229,174,254 | Solid | Rodgers-1985 | Metamorphic rock | High | DMU144 | Hebron Gneiss and equivalent formations (including equivalents of Paxton and Oakdale Formations of Massachusetts)
153 | SOs? | Southbridge Formation | Southbridge Formation | Silurian or Ordovician or both | see SOs (? denotes uncertain identification of the formation, with the most closely associated formation symbol used for the map unit). | 03-02-02-01-04 | DMU1 | SOs? | SOs? | 226,254,095 | Solid | Rodgers-1985 | Schist and gneiss, of sedimentary-rock origin | High | DMU145 | Hebron Gneiss and equivalent formations (including equivalents of Paxton and Oakdale Formations of Massachusetts)
154 | SOh | Hebron Gneiss | Hebron Gneiss | Silurian and Ordovician | Interlayered dark-gray, medium- to coarse-grained schist, composed of andesine, quartz, biotite, and local K-feldspar, and greenish-gray, fine- to medium-grained calc-silicate rock, composed of labradorite, quartz, biotite, actinolite, hornblende, and diopside, and locally scapolite. Local lenses of graphitic two-mica schist | 03-02-02-01-05 | DMU1 | SOh | SOh | 226,254,095 | Solid | Rodgers-1985 | Schist and gneiss, of sedimentary-rock origin | High | DMU146 | Hebron Gneiss and equivalent formations (including equivalents of Paxton and Oakdale Formations of Massachusetts)
155 | Obr | Brimfield Schist | Brimfield Schist | Upper? and Middle Ordovician | (Includes Hamilton Reservoir Formation) Gray, rusty-weathering, medium- to coarse-grained, interlayered schist and gneiss, composed of oligoclase, quartz, K-feldspar, and biotite, and commonly garnet, sillimanite, graphite, and pyrrhotite. K-feldspar partly as augen 1 to 3 cm across. Minor layers and lenses of hornblende and pyroxene-bearing gneiss, amphibolite, and calc-silicate rock | 03-02-02-01-06 | DMU1 | Obr | Obr | 143,188,143 | Solid | Rodgers-1985 | Schist and gneiss, of sedimentary-rock origin | High | DMU147 | Brimfield Schist and equivalent formations (includes Tatnic Hill Formation)
156 | Obrg | Gneiss (Metavolcanic) Member of Brimfield Schist | Gneiss (Metavolcanic) Member of Brimfield Schist | Upper? and Middle Ordovician | Medium-gray, medium-grained, layered gneiss and schist, composed of oligoclase, quartz, and biotite; some gneiss and most schist layers contain garnet and sillimanite; some gneiss layers contain garnet, hornblende, or pyroxene or grade into amphibolite or calc-silicate rock. Probably includes metavolcanic rocks | 03-02-02-01-06-01 | DMU2 | Obrg | Obrg | 214,220,185 | Solid | Rodgers-1985 | Metaigneous rock | High | DMU148 | Brimfield Schist and equivalent formations (includes Tatnic Hill Formation)
157 | Obr? | Brimfield Schist | Brimfield Schist | Upper? and Middle Ordovician | see Obr (? denotes uncertain identification of the formation, with the most closely associated formation symbol used for the map unit). | 03-02-02-01-07 | DMU1 | Obr? | Obr? | 143,188,143 | Solid | Rodgers-1985 | Schist and gneiss, of sedimentary-rock origin | High | DMU149 | Brimfield Schist and equivalent formations (includes Tatnic Hill Formation)
158 | Ota | Tatnic Hill Formation | Tatnic Hill Formation | Upper? and Middle Ordovician | Medium- to dark-gray, medium-grained gneiss or schist composed of quartz, andesine, biotite, garnet, and sillimanite, locally kyanite, muscovite, or K-feldspar, interlayered with locally mappable units and thinner layers of rusty-weathering graphitic pyrrhotitic two-mica schist, amphibolite, and calc-silicate rock | 03-02-02-01-08 | DMU1 | Ota | Ota | 143,188,143 | Solid | Rodgers-1985 | Schist and gneiss, of sedimentary-rock origin | High | DMU150 | Brimfield Schist and equivalent formations (includes Tatnic Hill Formation)
159 | Otay | Yantic Member of Tatnic Hill Formation | Yantic Member of Tatnic Hill Formation | Upper? and Middle Ordovician | Medium- to dark-gray, fine- to medium-grained schist, composed of quartz, oligoclase, biotite, and muscovite, some layers with garnet, staurolite, and kyanite or garnet and sillimanite, local epidote or K-feldspar; some layers of rusty-weathering graphitic, pyrrhotitic, two-mica schist | 03-02-02-01-08-01 | DMU2 | Otay | Otay | 146,174,047 | Solid | Rodgers-1985 | Schist and gneiss, of sedimentary-rock origin | High | DMU151 | Brimfield Schist and equivalent formations (includes Tatnic Hill Formation)
160 | Otaf | Fly Pond (calc-silicate) Member of Tatnic Hill Formation | Fly Pond (calc-silicate) Member of Tatnic Hill Formation | Upper? and Middle Ordovician | Light-gray, medium-grained, layered to massive calc-silicate gneiss, composed of andesine, quartz, hornblende or actinolite, epidote, and commonly diopside, biotite, and scapolite; some layers are calcitic | 03-02-02-01-08-02 | DMU2 | Otaf | Otaf | 226,254,095 | Solid | Rodgers-1985 | Schist and gneiss, of sedimentary-rock origin | High | DMU152 | Brimfield Schist and equivalent formations (includes Tatnic Hill Formation)
161 | Oq | Quinebaug Formation | Quinebaug Formation | Middle Ordovician or older | Medium- to dark-gray, commonly greenish, medium-grained, well-layered gneiss, composed of hornblende, andesine, biotite, and epidote, commonly with quartz or garnet, interlayered with amphibolite | 03-02-02-01-09 | DMU1 | Oq | Oq | 231,220,254 | Solid | Rodgers-1985 | Metamorphic rock | High | DMU153 | None
162 | Oqf | Felsic gneiss Member of Quinebaug Formation | Felsic gneiss Member of Quinebaug Formation | Middle Ordovician or older | Light- to medium-gray, fine- to medium-grained gneiss, composed of plagioclase, quartz, biotite, and muscovite, commonly with K-feldspar | 03-02-02-01-09-01 | DMU2 | Oqf | Oqf | 233,150,122 | Solid | Rodgers-1985 | Metamorphic rock | High | DMU154 | None
163 | Oqb | Black Hill Member of Quinebaug Formation | Black Hill Member of Quinebaug Formation | Middle Ordovician or older | Gray, medium- to fine-grained, well-layered schist and granofels, composed of oligoclase, quartz, and biotite, commonly with hornblende or muscovite, and locally with calcite, garnet, or epidote | 03-02-02-01-09-02 | DMU2 | Oqb | Oqb | 238,232,170 | Solid | Rodgers-1985 | Metamorphic rock | High | DMU155 | None
164 | None | Intrusive Rocks | None | None | None | 03-02-02-02 | Heading4 | None | None | None | None | Rodgers-1985 | None | None | DMU156 | None
165 | Dgg | Foliated Granitic Gneiss | Foliated Granitic Gneiss | Devonian? | Light-gray, coarse-grained, strongly to weakly foliated gneiss, composed of phenocrysts of K-feldspar in a groundmass of plagioclase, quartz, K-feldspar, and biotite, with accessory sillimanite and garnet | 03-02-02-02-01 | DMU1 | Dgg | Dgg | 254,179,179 | Solid | Rodgers-1985 | Meta-felsic and intermediate rock | High | DMU157 | None
166 | Dc | Canterbury Gneiss | Canterbury Gneiss | Devonian | (May be equivalent to Ayer Granite of Massachusetts) Light-gray, medium-grained, variably foliated, locally strongly lineated gneiss, composed of quartz, oligoclase, microcline, and biotite, locally also muscovite or epidote, and generally with megacrysts 1 to 2 cm long of either or both feldspars | 03-02-02-02-02 | DMU1 | Dc | Dc | 254,223,223 | Solid | Rodgers-1985 | Meta-felsic and intermediate rock | High | DMU158 | None
167 | Dce | "Eastford Gneiss Phase" of Canterbury Gneiss | "Eastford Gneiss Phase" of Canterbury Gneiss | Devonian | Mainly light gray, medium-grained, foliated to strongly lineated gneiss, composed of quartz, microcline, oligoclase or albite, biotite, and muscovite | 03-02-02-02-02-01 | DMU2 | Dce | Dce | 254,223,223 | Solid | Rodgers-1985 | Meta-felsic and intermediate rock | High | DMU159 | None
168 | D?d | Foliated Quartz Diorite | Foliated Quartz Diorite | Devonian in part, probably Ordovician in part | Mainly dark-gray, medium-grained, well-foliated gneiss (locally strongly sheared, especially near contacts), composed of plagioclase, quartz, biotite, and hornblende, locally also pyroxene (? denotes uncertainty about the designation of D (Devonian) for the age of the geologic formation). | 03-02-02-02-03 | DMU1 | D?d | D?d | 176,196,222 | Solid | Rodgers-1985 | Meta-felsic and intermediate rock | High | DMU160 | None
169 | Dn | Hornblende Norite | Hornblende Norite | Devonian? | Dark, coarse-grained, massive rock, composed of bytownite, hornblende, and hypersthene | 03-02-02-02-04 | DMU1 | Dn | Dn | 200,194,254 | Solid | Rodgers-1985 | Coarse-grained, mafic-composition intrusive igneous rock | High | DMU161 | None
170 | Dl | Lebanon Gabbro | Lebanon Gabbro | Devonian | Dark, speckled, coarse-grained, massive but locally sheared gabbro, composed of hornblende, labradorite, and opaques. Some bodies contain biotite and quartz; some smaller ones are nearly pure hornblende with local augite | 03-02-02-02-05 | DMU1 | Dl | Dl | 200,194,254 | Solid | Rodgers-1985 | Coarse-grained, mafic-composition intrusive igneous rock | High | DMU162 | None
171 | Dld | Dioritic Phase of Lebanon Gabbro | Dioritic Phase of Lebanon Gabbro | Devonian | White to black, streaked, medium-grained, foliated or sheared gneiss, composed of plagioclase, biotite, quartz, and generally hornblende | 03-02-02-02-05-01 | DMU2 | Dld | Dld | 176,196,222 | Solid | Rodgers-1985 | Meta-felsic and intermediate rock | High | DMU163 | None
172 | Op | Preston Gabbro | Preston Gabbro | Middle Ordovician or older | Dark, medium- to coarse-grained, mainly massive gabbro, composed of labradorite, augite, and opaques, generally with hornblende, locally hypersthene or olivine or both | 03-02-02-02-06 | DMU1 | Op | Op | 200,194,254 | Solid | Rodgers-1985 | Coarse-grained, mafic-composition intrusive igneous rock | High | DMU164 | None
173 | Opd | Dioritic phase of Preston Gabbro | Dioritic phase of Preston Gabbro | Middle Ordovician or older | Medium- to dark-gray, streaked or speckled, medium-grained diorite and quartz diorite, gneissic where sheared near contact, composed of plagioclase, hornblende, and biotite, and locally quartz and relic pyroxene | 03-02-02-02-06-01 | DMU2 | Opd | Opd | 176,196,222 | Solid | Rodgers-1985 | Coarse-grained, intermediate-composition intrusive igneous rock | High | DMU165 | None
174 | None | Intrusive and Stratified Rocks | None | None | None | 03-02-02-03 | Heading4 | None | None | None | None | Rodgers-1985 | None | None | DMU166 | None
175 | Op+Oq | Preston Gabbro and Quinebaug Formation undivided | Preston Gabbro and Quinebaug Formation undivided | Middle Ordovician or older | See Op and Oq | 03-02-02-03-01 | DMU1 | Op+Oq | Op+Oq | 200,194,254 lines; 231,220,254 background | Vertical lines 2 pts thick, separation: 5 pts over a solid background | Rodgers-1985 | Igneous and metamorphic rock | High | DMU167 | None
176 | None | Avalonian (Continental) Terrane | None | None | None | 03-03 | Heading2 | None | None | None | None | Rodgers-1985 | None | None | DMU168 | None
177 | None | Non-Avalonian Anticlinorium | None | None | None | 03-03-01 | Heading3 | None | None | None | None | Rodgers-1985 | None | None | DMU169 | None
178 | None | Intrusive Rocks | None | None | None | 03-03-01-01 | Heading4 | None | None | None | None | Rodgers-1985 | None | None | DMU170 | None
179 | Pw | Westerly Granite | Westerly Granite | Permian | Light-gray, pink-weathering, fine-grained, massive, aplitic granite, composed of oligoclase or albite, quartz, and K-feldspar, with minor biotite and accessory muscovite, magnetite, allanite, and sphene | 03-03-01-01-01 | DMU1 | Pw | Pw | 255,069,000 | Solid | Rodgers-1985 | Coarse-grained, felsic-composition intrusive igneous rock | High | DMU171 | None
180 | Pn | Narragansett Pier Granite | Narragansett Pier Granite | Permian | Pink to red, medium- to coarse-grained (commonly pegmatitic), generally massive (not gneissic) granite, composed of microcline, oligoclase, quartz, and biotite and accessory muscovite and magnetite. Considerable associated pegmatite | 03-03-01-01-02 | DMU1 | Pn | Pn | 254,134,207 | Solid | Rodgers-1985 | Coarse-grained, felsic-composition intrusive igneous rock | High | DMU172 | None
181 | Pnm | Mafic phase of Narragansett Pier Granite | Mafic phase of Narragansett Pier Granite | Permian | Gray to reddish, medium-grained, generally massive granite, like Pn but with more biotite and locally hornblende | 03-03-01-01-02-01 | DMU2 | Pnm | Pnm | 179,122,157 | Solid | Rodgers-1985 | Coarse-grained, felsic-composition intrusive igneous rock | High | DMU173 | None
182 | None | Avalonian Anticlinorium | None | None | None | 03-03-02 | Heading3 | None | None | None | None | Rodgers-1985 | None | None | DMU174 | None
183 | None | Intrusive Rocks | None | None | None | 03-03-02-01 | Heading4 | None | None | None | None | Rodgers-1985 | None | None | DMU175 | None
184 | None | Sterling Plutonic Group | None | None | None | 03-03-02-01-01 | Heading5 | None | None | None | None | Rodgers-1985 | None | None | DMU176 | None
185 | Zsh | Hope Valley Alaskite Gneiss | Hope Valley Alaskite Gneiss | Proterozoic Z? | Light-pink to gray, medium- to coarse-grained, locally porphyritic, variably lineated and foliated alaskitic gneiss, composed of microcline, quartz, albite or oligoclase, and minor magnetite, and locally biotite and muscovite. Lineation formed by rods of quartz. Locally contains quartz-sillimanite nodules | 03-03-02-01-01-01 | DMU1 | Zsh | Zsh | 254,194,194 | Solid | Rodgers-1985 | Meta-felsic and intermediate rock | High | DMU177 | None
186 | Zsph | Potter Hill Granite Gneiss | Potter Hill Granite Gneiss | Proterozoic Z? | Light-pink to gray, tan-weathering, fine- to medium-grained, rarely porphyritic, well-foliated (not lineated) granitic gneiss, composed of microcline, quartz, oligoclase (or albite), biotite, and magnetite, minor muscovite, and local garnet | 03-03-02-01-01-02 | DMU1 | Zsph | Zsph | 255,218,185 | Solid | Rodgers-1985 | Meta-felsic and intermediate rock | High | DMU178 | None
187 | Zspp | Porphyritic Phase of Potter Hill Granite Gneiss | Porphyritic Phase of Potter Hill Granite Gneiss | Proterozoic Z? | Light- to medium-gray, fine- to medium-grained, porphyritic, well-foliated (not lineated) granitic gneiss, composed of microcline (much of it as megacrysts up to 4 cm long), quartz, oligoclase, biotite, and magnetite | 03-03-02-01-01-02-01 | DMU2 | Zspp | Zspp | 255,054,023 lines; 255,217,186 background | Diagonal right down lines 1 pt thick, separation: 3 pts, angle: 135 degrees. Over solid background. | Rodgers-1985 | Meta-felsic and intermediate rock | High | DMU179 | None
188 | Zss | "Scituate" Granite Gneiss | "Scituate" Granite Gneiss | Proterozoic Z? | (Probably not equivalent to type Scituate in Rhode Island, which is probably Devonian) Light-pink to gray, medium- to coarse-grained, generally porphyritic, well-lineated and locally foliated granitic gneiss, composed of microcline, quartz, albite or orthoclase, biotite, hornblende, and magnetite. Megacrysts of microcline up to 3 cm long; lineation formed by splotches of biotite or by rods of quartz | 03-03-02-01-01-03 | DMU1 | Zss | Zss | 255,228,196 | Solid | Rodgers-1985 | Meta-felsic and intermediate rock | High | DMU180 | None
189 | Zsp | Ponaganset Gneiss | Ponaganset Gneiss | Proterozoic Z? | Dark-gray, coarse-grained, porphyritic, well-foliated gneiss, composed of oligoclase, quartz, microcline (mostly as megacrysts up to 8 cm long), biotite, magnetite, and generally hornblende; also garnet and muscovite where hornblende is absent | 03-03-02-01-01-04 | DMU1 | Zsp | Zsp | 216,191,216 | Solid | Rodgers-1985 | Metaigneous rock | High | DMU181 | None
190 | Zl | Light House Gneiss | Light House Gneiss | Proterozoic Z? | Light-pink or gray to red, medium-grained, generally well foliated granitic gneiss, composed of K-feldspar, oligoclase, quartz, biotite, and magnetite, with local muscovite but no garnet | 03-03-02-01-01-05 | DMU1 | Zl | Zl | 254,194,194 | Solid | Rodgers-1985 | Meta-felsic and intermediate rock | High | DMU182 | East Haven Granitic body (may be equivalent to Sterling Plutonic Group) (Includes Light House Gneiss, Branford Gneiss, and Stony Creek Granite Gneiss)
191 | Zb | Branford Gneiss | Branford Gneiss | Proterozoic Z? | Gray to white but rarely pink, medium-grained, well-foliated granitic gneiss composed of oligoclase, K-feldspar, quartz, biotite, garnet, magnetite, and muscovite | 03-03-02-01-01-06 | DMU1 | Zb | Zb | 254,238,000 background; 254,190,000 lines | Horizontal and diagonal lines over a solid background. Lines at angles of 0, 45, and 135 degrees, separation of 4 pts. Lines 1 pt thick. | Rodgers-1985 | Meta-felsic and intermediate rock | High | DMU183 | East Haven Granitic body (may be equivalent to Sterling Plutonic Group) (Includes Light House Gneiss, Branford Gneiss, and Stony Creek Granite Gneiss)
192 | Zsc | Stony Creek Granite Gneiss | Stony Creek Granite Gneiss | Proterozoic Z? | Red to pink, unevenly medium- to very coarse- grained, variably foliated granite or granite gneiss, composed of oligoclase, K-feldspar, and quartz with minor biotite and magnetite, sporadic garnet (in foliated varieties) and local muscovite. Commonly contains granite and pegmatite of Narragansett Pier type (and probably age). In much of area both granites occur as larger bodies full of inclusions of those units, which can be mapped through the bodies of granite. | 03-03-02-01-01-07 | DMU1 | Zsc | Zsc | 255,218,185 | Solid | Rodgers-1985 | Meta-felsic and intermediate rock | High | DMU184 | East Haven Granitic body (may be equivalent to Sterling Plutonic Group) (Includes Light House Gneiss, Branford Gneiss, and Stony Creek Granite Gneiss)
193 | None | Stratified Rocks | None | None | None | 03-03-02-02 | Heading4 | None | None | None | None | Rodgers-1985 | None | None | DMU185 | None
194 | Zw | Waterford Group | Waterford Group | Proterozoic Z? | (May be equivalent in part to Monson Gneiss) Interlayered part (but layers locally distinct) of Waterford Group, light to dark, generally medium grained gneiss, composed of plagioclase, quartz, and biotite, with hornblende in some layers and microcline in others. Some layers of amphibolite | 03-03-02-02-01 | DMU1 | Zw | Zw | 255,158,015 lines; 254,190,000 background | Diagonal right down lines 0.5 pts thick, separation: 3 pts, angle: 135 degrees. Over solid background. | Rodgers-1985 | Metaigneous rock | High | DMU186 | None
195 | Zwr | Rope Ferry Gneiss | Rope Ferry Gneiss | Proterozoic Z? | Interlayered (but layers commonly lenticular to indistinct) light- to dark-gray, fine- to medium-grained gneiss, composed of plagioclase, quartz, and biotite, with hornblende in some layers and microcline in others; local layers of amphibolite | 03-03-02-02-01-01 | DMU2 | Zwr | Zwr | 255,158,015 lines; 254,190,000 background | Diagonal right down lines 0.5 pts thick, separation: 3 pts, angle: 135 degrees. Over solid background. | Rodgers-1985 | Metaigneous rock | High | DMU187 | None
196 | Zwn | New London Gneiss | New London Gneiss | Proterozoic Z? | Massive, gray granodioritic gneiss, also interlayered light-gray gneiss and dark-gray amphibolite; gneiss generally medium grained; composed of oligoclase, quartz, biotite, and magnetite, also microcline in massive gneiss | 03-03-02-02-01-02 | DMU2 | Zwn | Zwn | 254,222,179 | Solid | Rodgers-1985 | Meta-felsic and intermediate rock | High | DMU188 | None
197 | Zwnj | Joshua Rock Member of New London Gneiss | Joshua Rock Member of New London Gneiss | Proterozoic Z? | (May include intrusive rocks of Ordovician age) Medium-gray (weathers with red spots of hematite), medium-grained, foliated gneiss composed of microperthite, quartz, albite, aegirine-augite, and magnetite; rare riebeckite | 03-03-02-02-01-02-01 | DMU3 | Zwnj | Zwnj | 233,150,122 | Solid | Rodgers-1985 | Metaigneous rock | High | DMU189 | None
198 | Zwm | Mamacoke Formation | Mamacoke Formation | Proterozoic Z? | Interlayered (but layers locally indistinct) light- to dark-gray, medium-grained gneiss, composed of plagioclase, quartz, and biotite; sillimanite, garnet, hornblende, or microcline in certain layers; in upper part locally contains quartz-sillimanite nodules or thin layers of quartzite, amphibolite, or calc-silicate rock | 03-03-02-02-01-03 | DMU2 | Zwm | Zwm | 174,151,075 | Solid | Rodgers-1985 | Metaigneous rock | High | DMU190 | None
199 | Zp | Plainfield Formation | Plainfield Formation | Proterozoic Z? | Interlayered light-gray, thin-bedded quartzite, in places with feldspar, mica, graphite, or pyrite, light- to medium-gray gneiss composed of quartz, oligoclase, and biotite (rarely microcline), medium- to dark-gray schist composed of quartz, oligoclase, biotite, sillimanite, and garnet, dark-gray or green gneiss composed of plagioclase, quartz, biotite, and hornblende (commonly with diopside), amphibolite, diopside-bearing quartzite, and calc-silicate rock. In places contains quartz-sillimanite nodules | 03-03-02-02-01-04 | DMU2 | Zp | Zp | 254,238,000 | Solid | Rodgers-1985 | Schist and gneiss, of sedimentary-rock origin | High | DMU191 | None
200 | Zpq | Quartzite Unit in Plainfield Formation | Quartzite Unit in Plainfield Formation | Proterozoic Z? | Light-gray, glassy, generally thin bedded quartzite, also feldspathic and micaceous quartzite containing quartz-sillimanite nodules | 03-03-02-02-01-04-01 | DMU3 | Zpq | Zpq | 254,172,000 | Solid | Rodgers-1985 | Quartzite | High | DMU192 | None
201 | None | Intrusive and Stratified Rocks | None | None | None | 03-03-02-03 | Heading4 | None | None | None | None | Rodgers-1985 | None | None | DMU193 | None
202 | Zw+Zb | Waterford Group and Branford Gneiss undivided | Waterford Group and Branford Gneiss undivided | Proterozoic Z? | See Zw and Zb | 03-03-02-03-01 | DMU1 | Zw+Zb | Zw+Zb | 254,238,000 lines; 254,190,000 background | Horizontal and diagonal lines over a solid background. Lines at angles of 0, 45, and 135 degrees, separation of 4 pts. Lines 1 pt thick. | Rodgers-1985 | Metaigneous rock | High | DMU194 | Partially includes the East Haven Granitic body (may be equivalent to Sterling Plutonic Group) (Includes Light House Gneiss, Branford Gneiss, and Stony Creek Granite Gneiss)
203 | None | Mixed Avalonian Anticlinorium and non- Avalonian Anticlinorium Rocks | None | None | None | 03-03-03 | Heading3 | None | None | None | None | Rodgers-1985 | None | None | DMU195 | None
204 | None | Intrusive Rocks | None | None | None | 03-03-03-01 | Heading4 | None | None | None | None | Rodgers-1985 | None | None | DMU196 | None
205 | Zsph+Pn | Potter Hill Granite Gneiss and Narragansett Pier Granite undivided | Potter Hill Granite Gneiss and Narragansett Pier Granite undivided | Permian and Proterozoic Z? | See Zsph and Pn | 03-03-03-01-01 | DMU1 | Zsph+Pn | Zsph+Pn | 254,134,207 ticks; 255,218,185 background | Randomly placed and oriented tick marks over a solid background. | Rodgers-1985 | Igneous and metamorphic rock | High | DMU197 | None
206 | Zsc+Pn | Stony Creek Granite Gneiss and Narragansett Pier Granite undivided | Stony Creek Granite Gneiss and Narragansett Pier Granite undivided | Permian and Proterozoic Z? | See Zsc and Pn | 03-03-03-01-02 | DMU1 | Zsc+Pn | Zsc+Pn | 254,134,207 ticks; 255,218,185 background | Randomly placed and oriented tick marks over a solid background. | Rodgers-1985 | Igneous and metamorphic rock | High | DMU198 | Partially includes the East Haven Granitic body (may be equivalent to Sterling Plutonic Group) (Includes Light House Gneiss, Branford Gneiss, and Stony Creek Granite Gneiss)
207 | None | Intrusive and Stratified Rocks | None | None | None | 03-03-03-02 | Heading4 | None | None | None | None | Rodgers-1985 | None | None | DMU199 | None
208 | Zp+Zsc+Pn | Plainfield Formation, Stony Creek Granite Gneiss, and Narragansett Pier Granite undivided | Plainfield Formation, Stony Creek Granite Gneiss, and Narragansett Pier Granite undivided | Permian and Proterozoic Z? | See Zp, Zsc, and Pn | 03-03-03-02-01 | DMU1 | Zp+Zsc+Pn | Zp+Zsc+Pn | 255,135,000 lines and ticks; 254,172,000 background | Vertical lines and randomly placed and oriented tick marks over a solid background. Lines 1 pt thick with separation: 5 pts. | Rodgers-1985 | Igneous and metamorphic rock | High | DMU200 | Partially includes the East Haven Granitic body (may be equivalent to Sterling Plutonic Group) (Includes Light House Gneiss, Branford Gneiss, and Stony Creek Granite Gneiss)
209 | Zp+Zsph+Pn | Plainfield Formation, Potter Hill Granite Gneiss, and Narragansett Pier Granite undivided | Plainfield Formation, Potter Hill Granite Gneiss, and Narragansett Pier Granite undivided | Permian and Proterozoic Z? | See Zp, Zsph, and Pn | 03-03-03-02-02 | DMU1 | Zp+Zsph+Pn | Zp+Zsph+Pn | 255,135,000 lines and ticks; 254,238,000 background | Vertical lines and randomly placed and oriented tick marks over a solid background. Lines 1 pt thick with separation: 5 pts. | Rodgers-1985 | Igneous and metamorphic rock | High | DMU201 | None
210 | Zpq+Zsc+Pn | Quartzite Unit in Plainfield Formation, Stony Creek Granite Gneiss, and Narragansett Pier Granite undivided | Quartzite Unit in Plainfield Formation, Stony Creek Granite Gneiss, and Narragansett Pier Granite undivided | Permian and Proterozoic Z? | See Zpq, Zsc, and Pn | 03-03-03-02-03 | DMU1 | Zpq+Zsc+Pn | Zpq+Zsc+Pn | 255,135,000 lines and ticks; 254,172,000 background | Vertical lines and randomly placed and oriented tick marks over a solid background. Lines 1 pt thick with separation: 5 pts. | Rodgers-1985 | Igneous and metamorphic rock | High | DMU202 | Partially includes the East Haven Granitic body (may be equivalent to Sterling Plutonic Group) (Includes Light House Gneiss, Branford Gneiss, and Stony Creek Granite Gneiss)
211 | Zw+Zsc+Pn | Waterford Group, Stony Creek Granite Gneiss, and Narragansett Pier Granite undivided | Waterford Group, Stony Creek Granite Gneiss, and Narragansett Pier Granite undivided | Permian and Proterozoic Z? | See Zw, Zsc, and Pn | 03-03-03-02-04 | DMU1 | Zw+Zsc+Pn | Zw+Zsc+Pn | 255,135,000 lines and ticks; 254,190,000 background | Vertical lines and randomly placed and oriented tick marks over a solid background. Lines 1 pt thick with separation: 5 pts. | Rodgers-1985 | Igneous and metamorphic rock | High | DMU203 | Partially includes the East Haven Granitic body (may be equivalent to Sterling Plutonic Group) (Includes Light House Gneiss, Branford Gneiss, and Stony Creek Granite Gneiss)
212 | None | Other | None | None | None | 04 | Heading1 | None | None | None | None | Rodgers-1985 | None | None | DMU204 | None
213 | l | Limit of mapping | Limit of mapping | N/A | Limit of bedrock mapping | 04-01 | DMU1 | l | l | Null color | Null fill | Rodgers-1985 | Unmapped area | High | DMU205 | None
214 | Jmf | Meriden Formation undivided | Meriden Formation undivided | Jurassic | None | 04-02 | DMU1 | Jmf | Jmf | 250,128,114 | Solid | Rodgers-1985 | Sedimentary and extrusive igneous material | High | DMU206 | None
215 | Pzu | Paleozoic Undivided | Paleozoic Undivided | Paleozoic | None | 04-03 | DMU1 | |u | Pzu | 236,251,204 (XSec D); 202,232,176 (XSec E) | Solid | Rodgers-1985 | Metamorphic rock | High | DMU207 | None

#### Glossary

OBJECTID | Term | Definition | DefinitionSourceID | Glossary_ID
--- | --- | --- | --- | ---
3 | Bedding | The arrangement of sedimentary rocks in beds or layers of varying thickness and character; the general physical and structural character or pattern of the beds and their contacts within a rock mass, such as cross-bedding and graded bedding; a collective term denoting the existence of beds. Also, the structure so produced. The term may be applied to the layered arrangement and structure of an igneous or metamorphic rock. | AGI | GLO01
13 | Boundary | The outline or boundary of the geologic units (or lack thereof) composing the state of Connecticut, as digitized from the Rodgers 1985 bedrock map publication. | CGNHS | GLO02
1 | certain | Identity of a feature can be determined using relevant observations and scientific judgment; therefore, one can be reasonably confident in the credibility of this interpretation. | FGDC-STD-013-2006 | GLO03
22 | CMU Line | Bracket, border, leader, or other cartographic line in the correlation of map units diagram. These lines do not serve topological purposes. | CGNHS | GLO04
9 | Contact | A plane or irregular surface between two types or ages of rock; examples are faults, intrusive borders, bedding planes separating distinct strata, and unconformities. | AGI | GLO05
21 | Cross Section | (a) A diagram or drawing that shows features transected by a given plane; specif. a vertical section drawn at right angles to the longer axis of a geologic feature, such as the trend of an orebody, the mean direction of a flow stream, or the axis of a fossil. (b) An actual exposure or cut that shows transected geologic features. | AGI | GLO06
27 | Cross Section Line | Bracket, border, leader, or other cartographic line in cross sections B-E. These lines do not serve topological purposes. | CGNHS | GLO07
28 | DMU1 | Paragraph style formatted description of first-ranked map unit. FGDCGeoAge font, bold name, regular description, 6 pt., 0 pt. leading, 0 pt. character spacing, left justified, 0.6” indent. | CGNHS | GLO08
29 | DMU2 | Paragraph style formatted description of second-ranked map unit. FGDCGeoAge font, bold name, regular description, 6 pt., 0 pt. leading, 0 pt. character spacing, left justified, 0.9” indent. | CGNHS | GLO09
30 | DMU3 | Paragraph style formatted description of third-ranked map unit. FGDCGeoAge font, bold name, regular description, 6 pt., 0 pt. leading, 0 pt. character spacing, left justified, 1.2” indent. | CGNHS | GLO10
10 | Fault | A discrete surface or zone of discrete surfaces separating two rock masses across which one mass has slid past the other. | AGI | GLO11
31 | Heading1 | Paragraph style formatted description of first-ranked map heading. Times New Roman font, bold, uppercase, 13pt., 0 pt. leading, 0 pt. character spacing, text centered, no indent. | CGNHS | GLO12
32 | Heading2 | Paragraph style formatted description of second-ranked map heading. Times New Roman font, bold, uppercase, 11 pt., 0 pt. leading, 0 pt. character spacing, text centered, no indent. | CGNHS | GLO13
33 | Heading3 | Paragraph style formatted description of third-ranked map heading. Times New Roman font, bold, uppercase, 7.5 pt., 0 pt. leading, 0 pt. character spacing, left justified, no indent. | CGNHS | GLO14
34 | Heading4 | Paragraph style formatted description of fourth-ranked map heading. Times New Roman font, bold, 6 pt., 0 pt. leading, 0 pt. character spacing, text centered, no indent. | CGNHS | GLO15
35 | Heading5 | Paragraph style formatted description of fifth-ranked map heading. Times New Roman font, bold, 6 pt., 0 pt. leading, 0 pt. character spacing, left justified, 0.1” indent. | CGNHS | GLO16
36 | High | The selected term in the GeoMaterial field (and its definition) adequately characterizes the overall lithologic nature of rocks and (or) sediments in the map unit. | GeMS | GLO17
11 | High-Angle Fault | A fault with a dip greater than 45 degrees. | AGI | GLO18
5 | Inclined Feature | Identified in 1:24,000 scale mapping. Feature within igneous rock unknown. At an angle between 1 and 89 degrees. | CGNHS | GLO19
6 | Inclined Foliation | A general term for a planar arrangement of textural or structural features in any type of rock, esp. the locally planar fabric in a rock defined by fissility, a preferred orientation of crystal planes in mineral grains, a preferred orientation of inequant grain shapes, or from compositional banding. In igneous rocks, planar parallelism of flaky or tabular minerals and mineral aggregates, slabby xenoliths, or flattened vesicles as well as compositional layering. In metamorphic rocks, planar parallelism of flaky minerals and compositional layering. At an angle of 90 degrees. | AGI-Modified | GLO20
12 | Klippe | (a) An erosional remnant of a thrust sheet that is completely surrounded by exposure of the footwall. (b) An isolated rock unit that is an erosional remnant or outlier of a nappe. The original sense of the term was merely descriptive, i.e. included any isolated rock mass such as an erosional remnant. | AGI | GLO21
14 | Mapping Limit | Limit of bedrock mapping. | Rodgers-1985 | GLO23
23 | Normal Fault | A fault in which the hanging wall has moved downward relative to the footwall. The angle of the fault is usually 45-90 degrees, and in most cases close to 60 degrees. | AGI | GLO25
15 | Strike-Slip Fault | A fault on which the movement is parallel to the fault's strike. | AGI | GLO26
39 | Terrane | Geologic regions (terranes) reflect the role of plate tectonics in the geologic history of Connecticut. Geologic terranes are regionally fault bounded group of rocks with a shared tectonic history. The rocks within a terrane can be various geologic formations and lithologies. Each terrane is named for its plate tectonics ancestry. | CGNHS | GLO27
16 | Thrust Fault | A fault with a dip of 45 degrees or less over much of its extent, on which the hanging wall has moved upward relative to the footwall. | AGI | GLO28
17 | Thrust Fault, Folded | A fault with a dip of 45 degrees or less over much of its extent, on which the hanging wall has moved upward relative to the footwall. The fault has been deformed to some extent by folding. | AGI-Modified | GLO29
18 | Thrust Fault, Folded and Overturned | A fault with a dip of 45 degrees or less over much of its extent, on which the hanging wall has moved upward relative to the footwall. The fault has been deformed to some extent by folding and tilted beyond the perpendicular. | AGI-Modified | GLO30
19 | Thrust Fault, Overturned | A fault with a dip of 45 degrees or less over much of its extent, on which the hanging wall has moved upward relative to the footwall. The fault has been tilted beyond the perpendicular. | AGI-Modified | GLO31
25 | Unconformity | A substantial break or gap in the geologic record where a rock unit is overlain by another that is not next in stratigraphic succession, such as an interruption in the continuity of a depositional sequence of sedimentary rocks or a break between eroded igneous rocks and younger sedimentary strata. It results from a change that caused deposition to cease for a considerable span of time, and it normally implies uplift and erosion with loss of the previously formed record. | AGI-Modified | GLO32
8 | unspecified | Identity of a feature cannot be determined using relevant observations and scientific judgment; therefore, one cannot be reasonably confident in the credibility of this interpretation. For example, IdentityConfidence = “questionable” would be appropriate when a geologist reasons, “I can see some kind of planar feature that separates map units in this outcrop, but I cannot be certain if it is a contact or a fault” | FGDC-STD-013-2006 | GLO33
4 | Vertical Feature | Identified in 1:24,000 scale mapping. Feature within igneous rock unknown. At an angle of 90 degrees. | CGNHS | GLO34
7 | Vertical Foliation | A general term for a planar arrangement of textural or structural features in any type of rock, esp. the locally planar fabric in a rock defined by fissility, a preferred orientation of crystal planes in mineral grains, a preferred orientation of inequant grain shapes, or from compositional banding. In igneous rocks, planar parallelism of flaky or tabular minerals and mineral aggregates, slabby xenoliths, or flattened vesicles as well as compositional layering. In metamorphic rocks, planar parallelism of flaky minerals and compositional layering. At an angle between 1 and 89 degrees. | AGI-Modified | GLO35
20 | Window | An eroded area of a thrust sheet that displays the rocks beneath the thrust sheet. | AGI | GLO36

### Database Inventory

This summary of database content is provided as a convenience to GIS analysts, reviewers, and others. It is not part of the GeMS compliance criteria.
DataSources, nonspatial table, 7 rows
DescriptionOfMapUnits, nonspatial table, 207 rows
GeoMaterialDict, nonspatial table, 101 rows
Glossary, nonspatial table, 34 rows
GeologicMap, feature dataset
MapUnitPolys, simple polygon feature class, 1892 rows
ContactsAndFaults, simple polyline feature class, 5544 rows
CartographicLines, simple polyline feature class, 5 rows
OrientationPoints, simple point feature class, 5346 rows
ContactsAndFaultsAnno, annotation polygon feature class, 299 rows
MapUnitPolysAnno, annotation polygon feature class, 1643 rows
CartographicLinesAnno, annotation polygon feature class, 10 rows
OrientationPoints_selectionAnno, annotation polygon feature class, 2038 rows
CorrelationOfMapUnits, feature dataset
CMUMapUnitPolys, simple polygon feature class, 137 rows
CMULines, simple polyline feature class, 272 rows
CMUText, annotation polygon feature class, 508 rows
CMUOtherPolys, simple polygon feature class, 20 rows
CrossSectionA, feature dataset
CSAMapUnitPolys, simple polygon feature class, 141 rows
CSAContactsAndFaults, simple polyline feature class, 163 rows
CSAText, annotation polygon feature class, 148 rows
CrossSectionB, feature dataset
CSBMapUnitPolys, simple polygon feature class, 55 rows
CSBContactsAndFaults, simple polyline feature class, 86 rows
CSBCartographicLines, simple polyline feature class, 14 rows
CSBText, annotation polygon feature class, 57 rows
CrossSectionC, feature dataset
CSCMapUnitPolys, simple polygon feature class, 79 rows
CSCContactsAndFaults, simple polyline feature class, 133 rows
CSCCartographicLines, simple polyline feature class, 17 rows
CSCText, annotation polygon feature class, 82 rows
CrossSectionD, feature dataset
CSDMapUnitPolys, simple polygon feature class, 167 rows
CSDContactsAndFaults, simple polyline feature class, 244 rows
CSDCartographicLines, simple polyline feature class, 41 rows
CSDText, annotation polygon feature class, 166 rows
CrossSectionE, feature dataset
CSEMapUnitPolys, simple polygon feature class, 234 rows
CSEContactsAndFaults, simple polyline feature class, 302 rows
CSECartographicLines, simple polyline feature class, 50 rows
CSEText, annotation polygon feature class, 184 rows