Preliminary Integrated Geologic Map Databases for the United States: Connecticut, Maine, Massachusetts, New Hampshire, New Jersey, Rhode Island, Vermont

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What does this data set describe?

Title:
Preliminary Integrated Geologic Map Databases for the United States: Connecticut, Maine, Massachusetts, New Hampshire, New Jersey, Rhode Island, Vermont
Abstract:
These metadata are specifically for the State of Connecticut, one state in the national compilation of state geologic map databases. The digital geologic map data was prepared by the Connecticut Geological and Natural History Survey in 2000. Subsequent editing of the spatial data by the USGS was limited to fitting a standardized state boundary to the data, standardizing the arc coding, reprojecting the data, and minor edits of arc or polygon attributes to conform with the paper map. This open-file report is one of several that present the preliminary results of the USGS Mineral Resources Program activity to compile a national-scale geologic map database to support national and regional level projects, including mineral resource and geoenvironmental assessments. The only comprehensive sources of regional- and national-scale geologic maps are state geologic maps with scales ranging from 1:100,000 to 1:1,000,000. Digital versions of these state maps form the core of what is presented here. Because no adequate geologic map exists for the state of Alaska, it is being compiled in regional blocks that also form part of this national database. It is expected that this series will completed by approximately the end of 2007. These maps and databases are being released in blocks of states or, in the case of Alaska, as compiled blocks of 1:250,000-scale quadrangles as chapters in this series. For Alaska, formal maps as well as databases are being published here, whereas for the conterminous U.S. only state databases and preview graphics are presented, because published maps for most states already exist. For Alaska these regional compilations will form the base for compiling a new geologic map of the state. As documented in CONUSdocumentationNENJ.pdf, standards for the conterminous U.S. are somewhat different than those for Alaska and Hawaii.
Supplemental_Information:
This database consists of up to five major Arc/Info GIS datasets for each state; - one: geologic map with formations, - two: faults (where present), - three: dikes (where present), - four: miscellaneous line features (where present), - five: miscellaneous point features (where present).
  1. How might this data set be cited?
    Nicholson, Suzanne W., Dicken, Connie L., Horton, John D., Foose, Michael P., Mueller, Julia A.L., and Hon, Rudi, 2006, Preliminary Integrated Geologic Map Databases for the United States: Connecticut, Maine, Massachusetts, New Hampshire, New Jersey, Rhode Island, Vermont: U.S. Geological Survey Open-File Report 2006-1272, U.S. Geological Survey, Reston, VA.

    Online Links:

  2. What geographic area does the data set cover?
    West_Bounding_Coordinate: -73.728129
    East_Bounding_Coordinate: -71.787751
    North_Bounding_Coordinate: 42.050375
    South_Bounding_Coordinate: 40.950954
  3. What does it look like?
  4. Does the data set describe conditions during a particular time period?
    Calendar_Date: 2006
    Currentness_Reference:
    publication date
  5. What is the general form of this data set?
    Geospatial_Data_Presentation_Form: map
  6. How does the data set represent geographic features?
    1. How are geographic features stored in the data set?
      This is a Vector data set.
    2. What coordinate system is used to represent geographic features?
      The map projection used is Lambert Conformal Conic.
      Projection parameters:
      Standard_Parallel: 33
      Standard_Parallel: 45
      Longitude_of_Central_Meridian: -100.0
      Latitude_of_Projection_Origin: 0
      False_Easting: 0.00000
      False_Northing: 0.00000
      Planar coordinates are encoded using coordinate pair
      Abscissae (x-coordinates) are specified to the nearest 0.01
      Ordinates (y-coordinates) are specified to the nearest 0.01
      Planar coordinates are specified in Meters
      The horizontal datum used is North American Datum of 1927.
      The ellipsoid used is Clarke 1866.
      The semi-major axis of the ellipsoid used is 6378206.4.
      The flattening of the ellipsoid used is 1/294.98.
  7. How does the data set describe geographic features?
    CT_geol.pat
    Polygon attribute table for the Connecticut geologic coverage. (Source: ESRI)
    ORIG_LABEL
    unmodified map unit symbol from source cover.

    type: character width: 12 output width: 12 (Source: Doug Stoeser (USGS))
    ValueDefinition
    CcCheshire Quartzite
    CdDalton Formation
    CeEverett Schist
    ChHoosac Schist
    CmManhattan Schist
    CmaAmphibolite-bearing unit of Manhattan Schist
    CmclLower slice of Canaan Mountain Schist
    CmcuUpper slice of Canaan Mountain Schist
    CmcubBasal member of upper slice of Canaan Mountain Schist
    CsaUnit a [of Stockbridge Marble]
    CsbUnit b [of Stockbridge Marble]
    CscUnit c [of Stockbridge Marble]
    CwbWaterbury Gneiss
    D?dFoliated quartz diorite
    DSsScotland Schist
    DSsqQuartzite unit [in Scotland Schist]
    DStThe Straits Schist
    DStsSouthington Mountain Member [of The Straits Schist]
    DSwWepawaug Schist
    DblLittleton Formation
    Dbl?Littleton Formation (uncertain)
    DblmMount Pisgah Member of Littleton Formation
    DcCanterbury Gneiss
    DceEastford gneiss phase [of Canterbury Gneiss]
    DeErving Formation
    DggFoliated granitic gneiss
    DlLebanon Gabbro
    DldDioritic phase [of Lebanon Gabbro]
    DlpLamprophyre
    DmMaromas Granite Gneiss
    DnHornblende norite
    DngNonewaug Granite
    JbButtress Dolerite
    Jb?Buttress Dolerite (uncertain)
    JebEast Berlin Formation
    JhaHampden Basalt
    JhoHolyoke Basalt
    JpPortland Arkose
    JsiSilicified rock and mylonite along Mesozoic faults
    JsmShuttle Meadow Formation
    JtaTalcott Basalt
    JwrWest Rock Dolerite
    Jwr?West Rock Dolerite (uncertain)
    OCrRowe Schist
    OCr+OCraRowe Schist plus Amphibolite unit [in Rowe Schist]
    OCr?Rowe Schist
    OCsStockbridge Marble
    OaAllingtown Metavolcanics
    Oa+OmaAllingtown Metavolcanics plus Maltby Lakes Metavolcanics
    ObBrookfield Gneiss
    ObrBrimfield Schist
    Obr?Brimfield Schist (uncertain)
    ObrgGneiss (metavolcanic) member [of Brimfield Schist]
    ObsBristol Gneiss
    OcCollinsville Formation
    OcgHornblende gneiss member [of Collinsville Formation]
    OchCollins Hill Formation
    OchvMetavolcanic member [of Collins Hill Formation]
    OcmCobble Mountain Formation
    OcsSweetheart Mountain Member [of Collinsville Formation]
    OgOrdovician? granitic gneiss
    Og?Ordovician? granitic gneiss
    OghGolden Hill Schist
    Ogh?Golden Hill Schist
    OglGlastonbury Gneiss
    OhHarrison Gneiss (including Prospect Gneiss)
    Oh?Harrison Gneiss
    OhbBeardsley Member [of Harrison (Prospect) Gneiss]
    OhcHawley Formation
    OhnNodular member [of Harrison Gneiss]
    OhpPumpkin Ground Member [of Harrison (Prospect) Gneiss]
    OlLitchfield Norite
    OmMiddletown Formation
    Om?Middletown Formation
    OmaMaltby Lakes Metavolcanics
    OmalLower part [of Maltby Lakes Metavolcanics]
    OmauUpper part [of Maltby Lakes Metavolcanics]
    OmlLower member [of Middletown Formation]
    OmmMassive mafic rock (in Middletown Formation)
    OmoMonson Gneiss
    OmuUpper member [of Middletown Formation]
    OoOronoque Schist
    OpPreston Gabbro
    Op+OqPreston Gabbro plus Quinebaug Formation
    OpdDioritic phase [of Preston Gabbro]
    OqQuinebaug Formation
    OqbBlack Hill Member [of Quinebaug Formation]
    OqfFelsic gneiss member [of Quinebaug Formation]
    OrRatlum Mountain Schist
    Or+OraRatlum Mountain Schist plus Amphibolite unit [in Ratlum Mountain Schist]
    Or?Ratlum Mountain Schist
    OraAmphibolite unit [in Ratlum Mountain Schist]
    OseUnits e and d [of Stockbridge Marble]
    OsgUnits g and f [of Stockbridge Marble]
    OtTaine Mountain Member
    Ot+OcTaine Mountain and Collinsville Formations undivided
    OtaTatnic Hill Formation
    OtafFly Pond (calc-silicate) Member [of Tatnic Hill Formation]
    OtayYantic Member [of Tatnic Hill Formation]
    OtbBasal member [of Taine Mountain Formation]
    OtfTrap Falls Formation
    Otf+OgTrap Falls Formation plus Ordovician? granitic gneiss
    OtfcCarringtons Pond Member [of Trap Falls Formation]
    OtfgSchist and granulite member [of Trap Falls Formation]
    OtfsShelton Member [of Trap Falls Formation]
    OtsScranton Mountain Member [of Taine Mountain Formation]
    OtwWildcat Member [of Taine Mountain Formation]
    OtwvWhigville Member [of Taine Mountain Formation]
    OwWalloomsac Schist
    OwmBasal marble member [of Walloomsac Schist]
    PnNarragansett Pier Granite
    PnmMafic phase [of Narragansett Pier Granite]
    PpPorphyry (dacite or rhyolite)
    PpaPinewood Adamellite
    PsSyenite
    PwWesterly Granite
    PzmyMylonite along Paleozoic faults
    SOblLower member [of Bigelow Brook Formation]
    SObmMiddle member [of Bigelow Brook Formation]
    SObuUpper member [of Bigelow Brook Formation]
    SOhHebron Gneiss
    SOsSouthbridge Formation
    SOs?Southbridge Formation
    SOspPorphyritic member [of Southbridge Formation]
    SbcClough Quartzite
    SbfFitch Formation
    StbBasal member [of The Straits Schist]
    TRnhNew Haven Arkose
    TRnh+JbNew Haven Arkose plus Buttress Dolerite
    YgGneiss of Highlands massifs
    YgaAugen gneiss
    YghHornblende gneiss and amphibolite
    YgnLayered gneiss
    YgrPink granitic gneiss
    YgsRusty mica schist and gneiss
    ZlLight House Gneiss
    ZpPlainfield Formation
    Zp+Zsc+PnPlainfield Formation plus Stony Creek Granite Gneiss plus Narragansett Pier Granite
    Zp+Zsph+Pn?Plainfield Formation plus Potter Hill Granite Gneiss plus Narragansett Pier Granite
    ZpqQuartzite unit [in Plainfield Formation]
    Zpq+Zsc+PnQuartzite unit [in Plainfield Formation] plus Stony Creek Granite Gneiss plus Narragansett Pier Granite
    Zsc+PnStony Creek Granite Gneiss plus Narragansett Pier Granite
    ZshHope Valley Alaskite Gneiss
    ZspPonaganset Gneiss
    ZsphPotter Hill Granite Gneiss
    Zsph+PnPotter Hill Granite Gneiss plus Narragansett Pier Granite
    ZsppPorphyritic phase [of Potter Hill Granite Gneiss]
    ZssScituate Granite Gneiss
    ZwWaterford Group
    Zw+ZbWaterford Group and Branford Gneiss
    Zw+Zsc+PnWaterford Group plus Stony Creek Granite Gneiss plus Narragansett Pier Granite
    ZwmMamacoke Formation
    ZwnNew London Gneiss
    ZwnjJoshua Rock Member [of New London Gneiss]
    ZwrRope Ferry Gneiss
    lunknown
    uUltramafic rock
    waterWater
    SGMC_LABEL
    orig_label + ;n where n= province number (n=0 if no province number)

    type: character width: 16 output width: 16 (Source: Doug Stoeser (USGS))
    ValueDefinition
    CAc;0Cheshire Quartzite
    Cad;0Dalton Formation
    CAe;0Everett Schist
    CAh;0Hoosac Schist
    Cam;0Manhattan Schist
    CAma;0Amphibolite-bearing unit of Manhattan Schist
    CAmcl;0Lower slice of Canaan Mountain Schist
    CAmcu;0Upper slice of Canaan Mountain Schist
    CAmcub;0Basal member of upper slice of Canaan Mountain Schist
    Casa;0Unit a [of Stockbridge Marble]
    CAsb;0Unit b [of Stockbridge Marble]
    CAsc;0Unit c [of Stockbridge Marble]
    CAwb;0Waterbury Gneiss
    Dd;0Foliated quartz diorite
    DSs;0Scotland Schist
    DSsq;0Quartzite unit [in Scotland Schist]
    DSt;0The Straits Schist
    DSts;0Southington Mountain Member [of The Straits Schist]
    DSw;0Wepawaug Schist
    Dbl;0Littleton Formation
    Dbl1;0Littleton Formation (uncertain)
    Dblm;0Mount Pisgah Member of Littleton Formation
    Dc;0Canterbury Gneiss
    Dce;0Eastford gneiss phase [of Canterbury Gneiss]
    De;0Erving Formation
    Dgg;0Foliated granitic gneiss
    Dl;0Lebanon Gabbro
    Dld;0Dioritic phase [of Lebanon Gabbro]
    Dlp;0Lamprophyre
    Dm;0Maromas Granite Gneiss
    Dn;0Hornblende norite
    Dng;0Nonewaug Granite
    Jb;0Buttress Dolerite
    Jb1;0Buttress Dolerite (uncertain)
    Jeb;0East Berlin Formation
    Jha;0Hampden Basalt
    Jho;0Holyoke Basalt
    Jp;0Portland Arkose
    Jsi;0Silicified rock and mylonite along Mesozoic faults
    Jsm;0Shuttle Meadow Formation
    Jta;0Talcott Basalt
    Jwr;0West Rock Dolerite
    Jwr1;0West Rock Dolerite (uncertain)
    OCAr;0Rowe Schist
    OCAr+OCAra;0Rowe Schist plus Amphibolite unit [in Rowe Schist]
    OCAr1;0Rowe Schist
    OCAs;0Stockbridge Marble
    Oa;0Allingtown Metavolcanics
    Oa+Oma;0Allingtown Metavolcanics plus Maltby Lakes Metavolcanics
    Ob;0Brookfield Gneiss
    Obr;0Brimfield Schist
    Obr1;0Brimfield Schist (uncertain)
    Obrg;0Gneiss (metavolcanic) member [of Brimfield Schist]
    Obs;0Bristol Gneiss
    Oc;0Collinsville Formation
    Ocg;0Hornblende gneiss member [of Collinsville Formation]
    Och;0Collins Hill Formation
    Ochv;0Metavolcanic member [of Collins Hill Formation]
    Ocm;0Cobble Mountain Formation
    Ocs;0Sweetheart Mountain Member [of Collinsville Formation]
    Og;0Ordovician? granitic gneiss
    Og1;0Ordovician? granitic gneiss
    Ogh;0Golden Hill Schist
    Ogh1;0Golden Hill Schist
    Ogl;0Glastonbury Gneiss
    Oh;0Harrison Gneiss (including Prospect Gneiss)
    Oh1;0Harrison Gneiss
    Ohb;0Beardsley Member [of Harrison (Prospect) Gneiss]
    Ohc;0Hawley Formation
    Ohn;0Nodular member [of Harrison Gneiss]
    Ohp;0Pumpkin Ground Member [of Harrison (Prospect) Gneiss]
    Ol;0Litchfield Norite
    Om;0Middletown Formation
    Om1;0Middletown Formation
    Oma;0Maltby Lakes Metavolcanics
    Omal;0Lower part [of Maltby Lakes Metavolcanics]
    Omau;0Upper part [of Maltby Lakes Metavolcanics]
    Oml;0Lower member [of Middletown Formation]
    Omm;0Massive mafic rock (in Middletown Formation)
    Omo;0Monson Gneiss
    Omu;0Upper member [of Middletown Formation]
    Oo;0Oronoque Schist
    Op;0Preston Gabbro
    Op+Oq;0Preston Gabbro plus Quinebaug Formation
    Opd;0Dioritic phase [of Preston Gabbro]
    Oq;0Quinebaug Formation
    Oqb;0Black Hill Member [of Quinebaug Formation]
    Oqf;0Felsic gneiss member [of Quinebaug Formation]
    Or;0Ratlum Mountain Schist
    Or+Ora;0Ratlum Mountain Schist plus Amphibolite unit [in Ratlum Mountain Schist]
    Or1;0Ratlum Mountain Schist
    Ora;0Amphibolite unit [in Ratlum Mountain Schist]
    Ose;0Units e and d [of Stockbridge Marble]
    Osg;0Units g and f [of Stockbridge Marble]
    Ot;0Taine Mountain Member
    Ot+Oc;0Taine Mountain and Collinsville Formations undivided
    Ota;0Tatnic Hill Formation
    Otaf;0Fly Pond (calc-silicate) Member [of Tatnic Hill Formation]
    Otay;0Yantic Member [of Tatnic Hill Formation]
    Otb;0Basal member [of Taine Mountain Formation]
    Otf;0Trap Falls Formation
    Otf+Og;0Trap Falls Formation plus Ordovician? granitic gneiss
    Otfc;0Carringtons Pond Member [of Trap Falls Formation]
    Otfg;0Schist and granulite member [of Trap Falls Formation]
    Otfs;0Shelton Member [of Trap Falls Formation]
    Ots;0Scranton Mountain Member [of Taine Mountain Formation]
    Otw;0Wildcat Member [of Taine Mountain Formation]
    Otwv;0Whigville Member [of Taine Mountain Formation]
    Ow;0Walloomsac Schist
    Owm;0Basal marble member [of Walloomsac Schist]
    Pn;0Narragansett Pier Granite
    Pnm;0Mafic phase [of Narragansett Pier Granite]
    Pp;0Porphyry (dacite or rhyolite)
    Ppa;0Pinewood Adamellite
    Ps;0Syenite
    Pw;0Westerly Granite
    PZmy;0Mylonite along Paleozoic faults
    SObl;0Lower member [of Bigelow Brook Formation]
    SObm;0Middle member [of Bigelow Brook Formation]
    SObu;0Upper member [of Bigelow Brook Formation]
    SOh;0Hebron Gneiss
    SOs;0Southbridge Formation
    SOs1;0Southbridge Formation
    SOsp;0Porphyritic member [of Southbridge Formation]
    Sbc;0Clough Quartzite
    Sbf;0Fitch Formation
    Stb;0Basal member [of The Straits Schist]
    TRnh;0New Haven Arkose
    TRnh+Jb;0New Haven Arkose plus Buttress Dolerite
    Yg;0Gneiss of Highlands massifs
    Yga;0Augen gneiss
    Ygh;0Hornblende gneiss and amphibolite
    Ygn;0Layered gneiss
    Ygr;0Pink granitic gneiss
    Ygs;0Rusty mica schist and gneiss
    Zl;0Light House Gneiss
    Zp;0Plainfield Formation
    Zp+Zsc+Pn;0Plainfield Formation plus Stony Creek Granite Gneiss plus Narragansett Pier Granite
    Zp+Zsph+Pn1;0Plainfield Formation plus Potter Hill Granite Gneiss plus Narragansett Pier Granite
    Zpq;0Quartzite unit [in Plainfield Formation]
    Zpq+Zsc+Pn;0Quartzite unit [in Plainfield Formation] plus Stony Creek Granite Gneiss plus Narragansett Pier Granite
    Zsc+Pn;0Stony Creek Granite Gneiss plus Narragansett Pier Granite
    Zsh;0Hope Valley Alaskite Gneiss
    Zsp;0Ponaganset Gneiss
    Zsph;0Potter Hill Granite Gneiss
    Zsph+Pn;0Potter Hill Granite Gneiss plus Narragansett Pier Granite
    Zspp;0Porphyritic phase [of Potter Hill Granite Gneiss]
    Zss;0Scituate Granite Gneiss
    Zw;0Waterford Group
    Zw+Zb;0Waterford Group and Branford Gneiss
    Zw+Zsc+Pn;0Waterford Group plus Stony Creek Granite Gneiss plus Narragansett Pier Granite
    Zwm;0Mamacoke Formation
    Zwn;0New London Gneiss
    Zwnj;0Joshua Rock Member [of New London Gneiss]
    Zwr;0Rope Ferry Gneiss
    unknownunknown
    u;0Ultramafic rock
    water;0Water
    unit_link
    composite map label = ST + sgmc_label This creates a unique identifier for every unit in the CONUS (continental United States) covers.

    type: character width: 18 output width: 18 (Source: Doug Stoeser (USGS))
    ValueDefinition
    CTCAc;0Cheshire Quartzite
    CTCad;0Dalton Formation
    CTCAe;0Everett Schist
    CTCAh;0Hoosac Schist
    CTCam;0Manhattan Schist
    CTCAma;0Amphibolite-bearing unit of Manhattan Schist
    CTCAmcl;0Lower slice of Canaan Mountain Schist
    CTCAmcu;0Upper slice of Canaan Mountain Schist
    CTCAmcub;0Basal member of upper slice of Canaan Mountain Schist
    CTCasa;0Unit a [of Stockbridge Marble]
    CTCAsb;0Unit b [of Stockbridge Marble]
    CTCAsc;0Unit c [of Stockbridge Marble]
    CTCAwb;0Waterbury Gneiss
    CTDd;0Foliated quartz diorite
    CTDSs;0Scotland Schist
    CTDSsq;0Quartzite unit [in Scotland Schist]
    CTDSt;0The Straits Schist
    CTDSts;0Southington Mountain Member [of The Straits Schist]
    CTDSw;0Wepawaug Schist
    CTDbl;0Littleton Formation
    CTDbl1;0Littleton Formation (uncertain)
    CTDblm;0Mount Pisgah Member of Littleton Formation
    CTDc;0Canterbury Gneiss
    CTDce;0Eastford gneiss phase [of Canterbury Gneiss]
    CTDe;0Erving Formation
    CTDgg;0Foliated granitic gneiss
    CTDl;0Lebanon Gabbro
    CTDld;0Dioritic phase [of Lebanon Gabbro]
    CTDlp;0Lamprophyre
    CTDm;0Maromas Granite Gneiss
    CTDn;0Hornblende norite
    CTDng;0Nonewaug Granite
    CTJb;0Buttress Dolerite
    CTJb1;0Buttress Dolerite (uncertain)
    CTJeb;0East Berlin Formation
    CTJha;0Hampden Basalt
    CTJho;0Holyoke Basalt
    CTJp;0Portland Arkose
    CTJsi;0Silicified rock and mylonite along Mesozoic faults
    CTJsm;0Shuttle Meadow Formation
    CTJta;0Talcott Basalt
    CTJwr;0West Rock Dolerite
    CTJwr1;0West Rock Dolerite (uncertain)
    CTOCAr;0Rowe Schist
    CTOCAr+OCAra;0Rowe Schist plus Amphibolite unit [in Rowe Schist]
    CTOCAr1;0Rowe Schist
    CTOCAs;0Stockbridge Marble
    CTOa;0Allingtown Metavolcanics
    CTOa+Oma;0Allingtown Metavolcanics plus Maltby Lakes Metavolcanics
    CTOb;0Brookfield Gneiss
    CTObr;0Brimfield Schist
    CTObr1;0Brimfield Schist (uncertain)
    CTObrg;0Gneiss (metavolcanic) member [of Brimfield Schist]
    CTObs;0Bristol Gneiss
    CTOc;0Collinsville Formation
    CTOcg;0Hornblende gneiss member [of Collinsville Formation]
    CTOch;0Collins Hill Formation
    CTOchv;0Metavolcanic member [of Collins Hill Formation]
    CTOcm;0Cobble Mountain Formation
    CTOcs;0Sweetheart Mountain Member [of Collinsville Formation]
    CTOg;0Ordovician? granitic gneiss
    CTOg1;0Ordovician? granitic gneiss
    CTOgh;0Golden Hill Schist
    CTOgh1;0Golden Hill Schist
    CTOgl;0Glastonbury Gneiss
    CTOh;0Harrison Gneiss (including Prospect Gneiss)
    CTOh1;0Harrison Gneiss
    CTOhb;0Beardsley Member [of Harrison (Prospect) Gneiss]
    CTOhc;0Hawley Formation
    CTOhn;0Nodular member [of Harrison Gneiss]
    CTOhp;0Pumpkin Ground Member [of Harrison (Prospect) Gneiss]
    CTOl;0Litchfield Norite
    CTOm;0Middletown Formation
    CTOm1;0Middletown Formation
    CTOma;0Maltby Lakes Metavolcanics
    CTOmal;0Lower part [of Maltby Lakes Metavolcanics]
    CTOmau;0Upper part [of Maltby Lakes Metavolcanics]
    CTOml;0Lower member [of Middletown Formation]
    CTOmm;0Massive mafic rock (in Middletown Formation)
    CTOmo;0Monson Gneiss
    CTOmu;0Upper member [of Middletown Formation]
    CTOo;0Oronoque Schist
    CTOp;0Preston Gabbro
    CTOp+Oq;0Preston Gabbro plus Quinebaug Formation
    CTOpd;0Dioritic phase [of Preston Gabbro]
    CTOq;0Quinebaug Formation
    CTOqb;0Black Hill Member [of Quinebaug Formation]
    CTOqf;0Felsic gneiss member [of Quinebaug Formation]
    CTOr;0Ratlum Mountain Schist
    CTOr+Ora;0Ratlum Mountain Schist plus Amphibolite unit [in Ratlum Mountain Schist]
    CTOr1;0Ratlum Mountain Schist
    CTOra;0Amphibolite unit [in Ratlum Mountain Schist]
    CTOse;0Units e and d [of Stockbridge Marble]
    CTOsg;0Units g and f [of Stockbridge Marble]
    CTOt;0Taine Mountain Member
    CTOt+Oc;0Taine Mountain and Collinsville Formations undivided
    CTOta;0Tatnic Hill Formation
    CTOtaf;0Fly Pond (calc-silicate) Member [of Tatnic Hill Formation]
    CTOtay;0Yantic Member [of Tatnic Hill Formation]
    CTOtb;0Basal member [of Taine Mountain Formation]
    CTOtf;0Trap Falls Formation
    CTOtf+Og;0Trap Falls Formation plus Ordovician? granitic gneiss
    CTOtfc;0Carringtons Pond Member [of Trap Falls Formation]
    CTOtfg;0Schist and granulite member [of Trap Falls Formation]
    CTOtfs;0Shelton Member [of Trap Falls Formation]
    CTOts;0Scranton Mountain Member [of Taine Mountain Formation]
    CTOtw;0Wildcat Member [of Taine Mountain Formation]
    CTOtwv;0Whigville Member [of Taine Mountain Formation]
    CTOw;0Walloomsac Schist
    CTOwm;0Basal marble member [of Walloomsac Schist]
    CTPn;0Narragansett Pier Granite
    CTPnm;0Mafic phase [of Narragansett Pier Granite]
    CTPp;0Porphyry (dacite or rhyolite)
    CTPpa;0Pinewood Adamellite
    CTPs;0Syenite
    CTPw;0Westerly Granite
    CTPZmy;0Mylonite along Paleozoic faults
    CTSObl;0Lower member [of Bigelow Brook Formation]
    CTSObm;0Middle member [of Bigelow Brook Formation]
    CTSObu;0Upper member [of Bigelow Brook Formation]
    CTSOh;0Hebron Gneiss
    CTSOs;0Southbridge Formation
    CTSOs1;0Southbridge Formation
    CTSOsp;0Porphyritic member [of Southbridge Formation]
    CTSbc;0Clough Quartzite
    CTSbf;0Fitch Formation
    CTStb;0Basal member [of The Straits Schist]
    CTTRnh;0New Haven Arkose
    CTTRnh+Jb;0New Haven Arkose plus Buttress Dolerite
    CTYg;0Gneiss of Highlands massifs
    CTYga;0Augen gneiss
    CTYgh;0Hornblende gneiss and amphibolite
    CTYgn;0Layered gneiss
    CTYgr;0Pink granitic gneiss
    CTYgs;0Rusty mica schist and gneiss
    CTZl;0Light House Gneiss
    CTZp;0Plainfield Formation
    CTZp+Zsc+Pn;0Plainfield Formation plus Stony Creek Granite Gneiss plus Narragansett Pier Granite
    CTZp+Zsph+Pn1;0Plainfield Formation plus Potter Hill Granite Gneiss plus Narragansett Pier Granite
    CTZpq;0Quartzite unit [in Plainfield Formation]
    CTZpq+Zsc+Pn;0Quartzite unit [in Plainfield Formation] plus Stony Creek Granite Gneiss plus Narragansett Pier Granite
    CTZsc+Pn;0Stony Creek Granite Gneiss plus Narragansett Pier Granite
    CTZsh;0Hope Valley Alaskite Gneiss
    CTZsp;0Ponaganset Gneiss
    CTZsph;0Potter Hill Granite Gneiss
    CTZsph+Pn;0Potter Hill Granite Gneiss plus Narragansett Pier Granite
    CTZspp;0Porphyritic phase [of Potter Hill Granite Gneiss]
    CTZss;0Scituate Granite Gneiss
    CTZw;0Waterford Group
    CTZw+Zb;0Waterford Group and Branford Gneiss
    CTZw+Zsc+Pn;0Waterford Group plus Stony Creek Granite Gneiss plus Narragansett Pier Granite
    CTZwm;0Mamacoke Formation
    CTZwn;0New London Gneiss
    CTZwnj;0Joshua Rock Member [of New London Gneiss]
    CTZwr;0Rope Ferry Gneiss
    unknown Enumerated_Domain_Value_Definition: unknown 
    CTu;0Ultramafic rock
    CTwater;0Water
    source
    An alphanumeric code (e.g. US001) that designates the source material used.

    type: character width: 6 output width: 8 (Source: Doug Stoeser (USGS))
    unit_age
    The geologic age from the source map used.

    type: character width: 60 output width: 60 (Source: Doug Stoeser (USGS))
    ValueDefinition
    Cambrian? 
    Devonian 
    Devonian in part, probably Ordovician in part 
    Devonian or Silurian or both 
    Devonian? 
    Holocene 
    Lower Cambrian 
    Lower Cambrian and perhaps partly older 
    Lower Jurassic 
    Lower Ordovician 
    Lower Ordovician and Cambrian 
    Lower Ordovician or Cambrian or both 
    Lower? Ordovician 
    Middle Ordovician 
    Middle Ordovician or older 
    Middle Ordovician? 
    Middle or Lower Ordovician 
    Middle or Lower Ordovician? 
    Middle to Lower? Ordovician 
    Middle? Jurassic 
    Middle? Ordovician 
    Ordovician or older 
    Permian 
    Proterozoic Y 
    Proterozoic Y; may contain some older rocks 
    Proterozoic Z or Cambrian or both 
    Proterozoic Z? 
    Proterozoic Z? and Permian 
    Silurian 
    Silurian and Ordovician 
    Silurian and perhaps Ordovician 
    Silurian or Ordovician or both 
    Silurian or perhaps Ordovician 
    Upper Cambrian 
    Upper Triassic; possibly Lower Jurassic at top 
    Upper Triassic; possibly Lower Jurassic at top plus Middle? 
    Upper and Middle? Cambrian 
    Upper or Middle Paleozoic 
    Upper? and Middle Ordovician 
    probably mainly Jurassic 
    unknown 
    rocktype1
    The predominant lithology found in the formation.

    type: character width: 40 output width: 40 (Source: Johnson Lith Class 6.1a)
    ValueDefinition
    amphibolite 
    arkose 
    augen gneiss 
    basalt 
    calc-silicate rock 
    diabase 
    diorite 
    felsic gneiss 
    gabbro 
    gneiss 
    granite 
    granitic gneiss 
    granofels 
    greenschist 
    greenstone 
    lamprophyre 
    mafic gneiss 
    marble 
    mylonite 
    norite 
    orthogneiss 
    porphyry 
    quartz monzonite 
    quartzite 
    schist 
    shale 
    siltstone 
    syenite 
    ultramafic intrusive rock 
    unknown 
    water 
    rocktype2
    The second most predominant lithology in the formation.

    type: character width: 40 output width: 40 (Source: Johnson Lith Class 6.1)
    ValueDefinition
    amphibolite 
    basalt 
    biotite gneiss 
    calc-silicate rock 
    conglomerate 
    dacite 
    diabase 
    dolostone (dolomite) 
    felsic metavolcanic rock 
    gabbro 
    gneiss 
    granite 
    granitic gneiss 
    granofels 
    greenschist 
    greenstone 
    mafic gneiss 
    mafic metavolcanic rock 
    mica schist 
    pegmatite 
    phyllite 
    quartz diorite 
    quartzite 
    sandstone 
    schist 
    shale 
    siltstone 
    CT_geol.aat
    Arc attribute table for Connecticut geologic coverage. (Source: ESRI)
    arc-code
    Unique identifier for the line feature

    type: integer width: 3 output width: 3 (Source: AAT data dictionary)
    ValueDefinition
    1contact, location certain
    4normal fault, location certain, digitized with upthrown side on the right (code of 1 added to ARC-PARA1 where U/D is designated in source)
    7shoreline or riverbank
    10thrust fault, teeth on right from origin (angle of thrusting added to ARC-PARA1 where designated in source)
    30fault, sense of displacement unknown or undefined, location certain
    31fault, sense of displacement unknown or undefined, location approximate
    32fault, sense of displacement unknown or undefined, location inferred or queried
    87right lateral fault, location certain
    90left lateral fault, location certain
    99bounding line (neatline) of coverage
    124state boundary
    arc-para1
    Used for "decorated" lines where additional information is needed.

    type: integer width: 3 output width: 3 (Source: AAT data dictionary)
    ValueDefinition
    0no additional information
    1U/D is designated in source
    arc-para2
    "Scratch" field used mostly in Alaska.

    type: integer width: 3 output width: 3 (Source: AAT data dictionary)
    ValueDefinition
    0no additional information
    1cartographic boundary
    2questionable termination
    3folded and overturned; deformed
    4folded
    5klippe
    6overturned
    7window
    8limit of bedrock mapping
    9high angle
    source
    An alphanumeric code (e.g. US001) that designates the source material used.

    type: character width: 6 output width: 8 (Source: Doug Stoeser (USGS))
    ValueDefinition
    CT001Connecticut Geological and Natural History Survey, DEP, in cooperation with the U.S. Geological Survey, 2000, Bedrock Geology of Connecticut, scale 50,000. (http://magic.lib.uconn.edu/cgi-bin/MAGIC_DBsearch2.pl?Geography=37800&Loc=0000)
    CT101C.L. Dicken edits to source file (CT001). Added arcs.
    CT102C.L. Dicken edits to source file (CT001). Mistagged arcs.
    CT103C.L. Dicken edits to source file (CT001). Flipped arcs.
    CT104C.L. Dicken edits to source file (CT001). Flipped and mistagged arcs.
    US001Johnson, Bruce R. and Leveritch, Beth, 1998, 1:100,000 Scale State Boundaries of the Conterminous United States: U.S. Geological Survey, unpublished (see metadata file: st100kmeta.txt, CONUSdocumentationNENJ.pdf)
    Entity_and_Attribute_Overview:
    Coding for polygon attributes:

    NAME: FEATURE: orig_label unmodified map unit symbols from source cover sgmc_label orig_label modified for standard geologic age symbols and an integer code added for province unit_link sgmc_label and a state code identifier source reference to source of data unit_age geologic age rocktype1 predominant lithology rocktype2 second most predominant lithology

    Coding for arc attributes:

    NAME: FEATURE: arc-code unique integer identifier arc-para1 used where additional information is needed arc-para2 scratch field source reference to source of data

    Coding for point attributes:

    NAME: FEATURE: point_feature name of feature on map source reference to source of data

    Coding for dikes (special arcs) attributes:

    NAME: FEATURE: orig_label unmodified map unit symbols from source cover sgmc_label orig_label modified for standard geologic age symbols and an integer code added for province arc-code unique integer identifier dike_lith general lithology dike_age geologic age source reference to source of data

    Entity_and_Attribute_Detail_Citation: ESRI

Who produced the data set?

  1. Who are the originators of the data set? (may include formal authors, digital compilers, and editors)
    • Suzanne W. Nicholson
    • Connie L. Dicken
    • John D. Horton
    • Michael P. Foose
    • Julia A.L. Mueller
    • Rudi Hon
  2. Who also contributed to the data set?
    State Geologic Map Compilation (SGMC) activity of the National Surveys and Analysis projects of the US Geological Survey Mineral Resources Program.

  3. To whom should users address questions about the data?
    Suzanne W. Nicholson
    U.S. Geological Survey
    12201 Sunrise Valley Dr. MS954
    Reston, VA
    USA

    703-648-6344 (voice)
    swnich@usgs.gov

Why was the data set created?

A primary goal of this work is to develop geologic map datasets with standardized structure and attribution. The database design and standards are documented in CONUSdocumentationNENJ.pdf of this series. The intent is that contiguous databases can be merged seamlessly and without any additional effort. In addition to a common database structure, the conterminous U.S. state databases (the contiguous 48 states) have been fitted to a set of standard state boundaries so that, when states are merged, they match without slivers or overlap. No attempt has been made to reconcile differences in mapping across state boundaries.

How was the data set created?

  1. From what previous works were the data drawn?
    (source 1 of 4)
    Rodgers, John, 1985, Bedrock Geological Map of Connecticut: Connecticut Geological and Natural History Survey, Hartford, Connecticut.

    Online Links:

    • none

    Type_of_Source_Media: vector
    Source_Scale_Denominator: 125,000
    Source_Contribution: provided geology for state map
    (source 2 of 4)
    Connecticut Geological and Natural History Survey, DEP, and U.S. Geological Survey, 2000, Bedrock Geology of Connecticut: Connecticut Geological and Natural History Survey, Hartford, Connecticut.

    Online Links:

    Type_of_Source_Media: vector
    Source_Scale_Denominator: 50,000
    Source_Contribution: provided geology for state map
    state boundaries (source 3 of 4)
    Johnson, Bruce R., unpublished, 1:100,000 Scale State Boundaries of the Conterminous United States.

    Other_Citation_Details:
    Arc/INFO coverage developed by Bruce Johnson. Derived from USGS 100,000-scale DLG boundary layer quadrangles.
    Type_of_Source_Media: online
    Source_Scale_Denominator: 100,000
    Source_Contribution: provided linework of the conterminous state boundaries
    lithclass (source 4 of 4)
    Johnson, Bruce R., unpublished, Geologic Map Unit Classification, ver. 6.1.

    Other_Citation_Details:
    Document has been modified and is included in Appendices of the publication.
    Type_of_Source_Media: online; http:/geology.usgs.gov/dm
    Source_Scale_Denominator: none
    Source_Contribution:
    Source of lithologic codes and specific rock names found in ROCKTYPE1 and ROCKTYPE2.
  2. How were the data generated, processed, and modified?
    Date: 2003 (process 1 of 10)
    The purpose of this standardization is to allow all SGMC covers to be seamlessly joined without any additional effort to form regional or national level digital maps. Note that for Alaska, the state is being compiled as blocks of 1:250k quadrangles that will ultimately be used to compile a new state map. Douglas Stoeser (USGS) and Ric Wilson (USGS) are co-coordinators for the overall SGMC effort, with Stoeser coordinating work on the mainland states and Wilson coordinating work for Alaska and Hawaii.
    Date: 2005 (process 2 of 10)
    C.L. Dicken obtained the digital geologic map of Connecticut from the following website: http://magic.lib.uconn.edu/cgi-bin/MAGIC_DBsearch2.pl?Geography=37800&Loc=0000

    The coverage was re-projected into the following:

    projection: Lambert Conformal Conic units: meters datum: NAD27 standard parallel 1: 33 0 0.000 standard parallel 2: 45 0 0.000 central meridian: -100 0 0.000 reference latitude: 0 0 0.000 false easting: 0.00000 false northing: 0.00000

    (Note: Attributes associated with the generation of the coverages were not deleted. PAT - shape, area, perimeter, coverage#, and coverage-id AAT - shape, fnode#, tnode#, lnode#, rnode#, length, coverage#, and coverage-id)

    All attributes were deleted except unit. The values from unit where then calculated into a new field called orig_label.
    Date: 2005 (process 3 of 10)
    The relevant state outline (arcs) was removed from the coverage and replaced with the arcs from the 1:100,000 Scale State Boundaries of the Conterminous United States.

    This allows for a seamless fit of each state to a standard state boundary base.
    Date: 2005 (process 4 of 10)
    The following attributes were exported from Filemaker as a .dbf: orig_label, map_symbol2, unit_link, reference_id, unit_age, rocktype1, and rocktype2.

    orig_label reflects the original map symbol used on the source map

    map_symbol2 reflects map-symbol1 with the addition of a province number

    unit_link is an auto generated field based on map-symbol2 and the state abbreviation (e.g. CT001) that produces a unique identifier for each map unit

    reference_id was populated with an alphanumeric code (e.g. US001) that designates the source used for the linework and other references used to describe the age or lithologies of the unit.

    unit_age was populated with general age assignment

    rocktype1 records dominant lithology (does not imply minimum percentage of abundance), using standardized data dictionary

    rocktype2 records second most dominant lithology, using standardized data dictionary

    The attributes were then converted using the following structure:

    item name: orig_label width: 12 output: 12 type: c

    item name: sgmc_label width: 16 output: 16 type: c

    item name: unit_link width: 18 output: 18 type: c

    item name: source width: 6 output: 8 type: c

    item name: unit_age width: 60 output: 60 type: c

    item name: rocktype1 width: 40 output: 40 type: c

    item name: rocktype2 width: 40 output: 40 type: c
    Date: 2005 (process 5 of 10)
    Once the .dbf was in the correct format with standardized column widths and data structure, it was converted into a lookup table (.lut) in Arc/Info. Then a joinitem was performed to join the look-up table to the polygon attribute table. orig_label was used as the merge item.
    Date: 2005 (process 6 of 10)
    Next, in preparing the uniform .aat file, the following items were added to the table:

    item name: arc-code width: 3 output: 3 type: i

    item name: arc-para1 width: 3 output: 3 type: i

    item name: arc-para2 width: 3 output: 3 type: i

    item name: source width: 6 output: 8 type: c

    Date: 2005 (process 7 of 10)
    Arc-code was populated using the paper map source to tag the lines using the AAT line type data dictionary (see CONUSdocumentationNENJ.pdf in this series).

    Arc-para1 was populated when additional information was available such as identifying the upthrown side of a fault or direction of thrusting on a fault. (see CONUSdocumentationNENJ.pdf)

    Arc-para2 is a scratch field that is used mostly in Alaska.

    Source was populated with an alphanumeric code (e.g. US001) that designates the source used for the linework.

    Date: 2006 (process 8 of 10)
    Once the .aat and the .pat were populated with the correct attributes, the coverage was exported as an .e00 file (CTgeol_lcc.e00).

    Then it was unprojected into geographic coordinates and exported again (CTgeol_dd.e00).
    Date: 2006 (process 9 of 10)
    Faults were extracted from the coverage and created a separate fault coverage (CTfaults_lcc) and then exported (CTfaults_lcc.e00).
    Date: 2006 (process 10 of 10)
    Finally, the geology lines and geology polygons were converted into shapefiles; in both geographic coordinates and in Lambert Conformal Conic projection.
  3. What similar or related data should the user be aware of?

How reliable are the data; what problems remain in the data set?

  1. How well have the observations been checked?
    The values of the attributes ROCKTYPE1 and ROCKTYPE2 were assigned based on the information in the legends of the source maps (most of which are paper). The definitions of these values are described in the draft document Geologic Map Classification version 6.1 (Johnson and others); available at the following website: http://geology.usgs.gov/dm
  2. How accurate are the geographic locations?
    Accuracy of Connecticut state boundary and those arcs intersecting it: The accuracy of the state boundary arcs is based on the 1:100,000 scale original data used to produce this boundary. (Johnson, Bruce R. and Leveritch, Beth, 1998, 1:100,000 Scale State Boundaries of the Conterminous United States: U.S. Geological Survey, unpublished (see metadata file: st100kmeta.txt, CONUSdocumentationNENJ.pdf))

    Those internal arcs intersecting the state boundary were extended or shortened as needed to complete polygons, possibly creating a small amount of error.
  3. How accurate are the heights or depths?
  4. Where are the gaps in the data? What is missing?
    Bodies of water are classified as water, and the geologic units underlying them are not included in this coverage.
  5. How consistent are the relationships among the observations, including topology?
    All internal polygons were checked for closure with vendor software and on hard copy plots. Overshoots and undershoots have been deleted or corrected as appropriate.

How can someone get a copy of the data set?

Are there legal restrictions on access or use of the data?
Access_Constraints: none
Use_Constraints:
This database is not meant to be used or displayed at any scale other than 1:500,000.

Any hardcopies utilizing these data sets shall clearly indicate their source. If the licensee has modified the data in any way they are obligated to describe the types of modifications they have performed on the hardcopy map. Licensee specifically agrees not to misrepresent these data sets, nor to imply that changes they made were approved by the U.S. Geological Survey.

  1. Who distributes the data set? (Distributor 1 of 1)
    U.S. Geological Survey Information Services Reston-ESIC
    U.S. Geological Survey
    507 National Center
    Reston, Virginia
    USA

    1-888-ASK-USGS or 1-703-648-5953 (voice)
  2. What's the catalog number I need to order this data set?
  3. What legal disclaimers am I supposed to read?
    Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the USGS. Although these data have been used by the USGS and have been successfully imported into data base programs, no warranty, expressed or implied, is made by the USGS as to how successfully or accurately the data can be imported into any specific application software running on any specific hardware platform. The fact of distribution shall not constitute any such warranty, and no responsibility is assumed by the USGS in connection therewith. This data base GIS is not meant to be used or displayed at any scale other than 1:500,000.
  4. How can I download or order the data?
    • Availability in digital form:
      Data format: Geologic units and structural features in format ARC/INFO export (version 9.0)
      Network links: http://pubs.usgs.gov/of/2006/1272/
    • Cost to order the data: none


Who wrote the metadata?

Dates:
Last modified: 12-Jan-2006
Metadata author:
U.S. Geological Survey
Attn: Connie L. Dicken
12201 Sunrise Valley Dr. MS954
Reston, VA
USA

703-648-6482 (voice)
cdicken@usgs.gov
Metadata standard:
Content Standard for Digital Geospatial Metadata (FGDC-STD-001-1998)

This page is <https://mrdata.usgs.gov/geology/state/metadata/ct.faq.html>
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