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

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Frequently anticipated questions:

What does this data set describe?

Preliminary Integrated Geologic Map Databases for the United States: Connecticut, Maine, Massachusetts, New Hampshire, New Jersey, Rhode Island, Vermont
These metadata are specifically for the State of Massachusetts, one state in the national compilation of state geologic map databases. The digital geologic state map of Massachusetts was prepared by Dr. Rudi Hon (Boston College) in 1998 under contract to the USGS. 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.
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: -73.509
    East_Bounding_Coordinate: -69.781
    North_Bounding_Coordinate: 42.887
    South_Bounding_Coordinate: 41.142
  3. What does it look like?
  4. Does the data set describe conditions during a particular time period?
    Calendar_Date: 2006
    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?
    Polygon attribute table for the Massachusetts geologic coverage. (Source: ESRI)
    unmodified map unit symbol from source cover.

    type: character width: 12 output width: 12 (Source: Doug Stoeser (USGS))
    amBelchertown Complex
    DbdBelchertown Complex
    DbhBelchertown Complex
    DbiBelchertown Complex
    DbmdBelchertown Complex
    DbmdgBelchertown Complex
    DbmdtBelchertown Complex
    DbpBelchertown Complex
    DbtBelchertown Complex
    DcgrChelmsford Granite
    DchgrCoys Hill Porphyritic Granite Gneiss
    DchhCoys Hill Porphyritic Granite Gneiss
    DcygrCherry Hill Granite
    DdiBiotite-hornblende diorite and quartz-bearing diorite
    DdnMeladiorite and norite
    DeErving Formation
    DeaErving Formation
    DegErving Formation
    DevErving Formation
    DfgdFitchburg Complex
    DfgdsFitchburg Complex
    DfgrFitchburg Complex
    DfgrgFitchburg Complex
    DftFitchburg Complex
    DgGoshen Formation
    DgcGoshen Formation
    DglGoshen Formation
    DgmGile Mountain Formation
    DgmaGile Mountain Formation
    DgmqGile Mountain Formation
    DgpGoshen Formation
    DgqGoshen Formation
    DgrBiotite-muscovite granite
    DguGoshen Formation
    DhgrHardwick Tonalite
    DhtHardwick Tonalite
    diFine-grained hornblende diorite
    DlLittleton Formation
    Dl+OpsIntimately interfolded Littleton and Partridge Formations
    DlfLittleton Formation
    DlmLittleton Formation
    DloLittleton Formation
    DmgMiddlefield Granite
    DmgrMuscovite-bearing granite
    DOgrAlkalic granite in Franklin
    DpeFeldspar-quartz-muscovite pegmatite
    DpgbPrescott Complex
    DpggCooleyville Granitic Gneiss
    DpgrPeabody Granite
    DpvPutney Volcanics
    DrgrGranite of Rattlesnake Hill pluton
    DrhBiotite-garnet-feldspar gneiss of Ragged Hill
    DSdiDiorite and tonalite
    DSnNewbury Volcanic Complex
    DSnaNewbury Volcanic Complex
    DSnlNewbury Volcanic Complex
    DSnrNewbury Volcanic Complex
    DSnuNewbury Volcanic Complex
    DSwWorcester Formation
    DwWaits River Formation
    DwaWaits River Formation
    DwgdWilliamsburg Granodiorite
    DwmWenham Monzonite
    DwtWaits River Formation
    DZlLynn Volcanic Complex
    EbwBraintree Argillite and Weymouth Formation
    EcCheshire Quartzite
    EgGreen Lodge Formation of Rhodes and Graves
    EhHoppin Formation
    EhhHatch Hill Formation
    EsaStockbridge Formation
    EsbStockbridge Formation
    EscStockbridge Formation
    EZcmCanaan Mountain Formation
    EZdDalton Formation
    EZdbsDalton Formation
    EZdcDalton Formation
    EZdgDalton Formation
    EZdqDalton Formation
    EZdsDalton Formation
    EZevEverett Formation
    EZevcEverett Formation
    EZgGreylock Schist
    EZgaGreylock Schist
    EZhHoosac Formation
    EZhaHoosac Formation
    EZhdHoosac Formation
    EZhdaHoosac Formation
    EZhdcHoosac Formation
    EZhgHoosac Formation
    EZhgaHoosac Formation
    EZhgtHoosac Formation
    EZhkHoosac Formation
    EZhrHoosac Formation
    EZhwHoosac Formation
    EZnNassau Formation
    EZnaNassau Formation
    EZngyNassau Formation
    EZnpNassau Formation
    EZnrNassau Formation
    EZnvNassau Formation
    EZw+nWest Castleton and Nassau Formations, undivided
    fgrFine-grained granite and granite porphyry
    gbHornblende-olivine gabbro
    gfBelchertown Complex
    grgBiotite granitic gneiss
    hgHornblende-plagioclase gneiss
    igdGranodiorite of the Indian Head pluton
    JdDiabase dikes and sills
    JdbDeerfield Basalt
    JeEast Berlin Formation
    JecEast Berlin Formation
    JfgMylonite along Connecticut Valley border fault
    JgbGranby Basaltic Tuff
    JhabHampden Basalt
    JhbHolyoke Basalt
    JhvHitchcock Volcanics
    JmMount Toby Formation
    JmaMount Toby Formation
    JmcMount Toby Formation
    JmgMount Toby Formation
    JnNew Haven Arkose
    JpPortland Formation
    JpcPortland Formation
    JsSugarloaf Formation
    JscSugarloaf Formation
    JsiSilicified fault-breccia or strongly silicified metamorphic rocks
    JsmShuttle Meadow Formation
    JsmcShuttle Meadow Formation
    JtTurner Falls Sandstone
    JtcTurner Falls Sandstone
    KCretaceous sediments
    mgrLight-gray muscovite granite
    OaAmmonoosuc Volcanics
    OaglAustin Glen Graywacke
    OaqAmmonoosuc Volcanics
    OauAmmonoosuc Volcanics
    OcaCobble Mountain Formation
    OcarCobble Mountain Formation
    OcbCobble Mountain Formation
    OcbrCobble Mountain Formation
    OccCobble Mountain Formation
    OccaCobble Mountain Formation
    OccrCobble Mountain Formation
    OcdCobble Mountain Formation
    OcoCollinsville Formation
    OcoaCollinsville Formation
    Ocoa1Collinsville Formation
    Ocoa2Collinsville Formation
    Ocoa3Collinsville Formation
    OcocCollinsville Formation
    OcofCollinsville Formation
    OcogCollinsville Formation
    OcorCollinsville Formation
    OcuCobble Mountain Formation
    OdDiorite at Goff Ledges
    OErRowe Schist
    OEraRowe Schist
    OErcRowe Schist
    OgdDiorite at Goff Ledges
    OglGlastonbury Gneiss
    OgrWhite to gray and black-spotted muscovite-biotite granite and granodiorite
    OhHawley Formation
    OhbHawley Formation
    OhfHawley Formation
    OhgHawley Formation
    OhpHawley Formation
    OhpgGneiss at Hallockville Pond
    OmMoretown Formation
    OmaMoretown Formation
    OmalMoretown Formation
    OmsMoretown Formation
    OmscMoretown Formation
    OmskMoretown Formation
    OngbNahant Gabbro and gabbro at Salem Neck
    OpaPartridge Formation
    OpauPartridge Formation
    OpbgPartridge Formation
    OpcPauchaug Gneiss
    OpfPartridge Formation
    OpoPoultney Formation
    OpsPartridge Formation
    OpsaPartridge Formation
    OpscPartridge Formation
    OpsgPartridge Formation
    OpuPartridge Formation
    OpvPartridge Formation
    OpvsPartridge Formation
    OsdStockbridge Formation
    OseStockbridge Formation
    OsfStockbridge Formation
    OsgStockbridge Formation
    OtbTectonic breccia
    OtblTectonic breccia
    OtrWhite, magnetite-bearing alaskite and trondhjemite
    OwWalloomsac Formation
    OwlWalloomsac Formation
    OwmWalloomsac Formation
    OwqWalloomsac Formation
    OZfFish Brook Gneiss
    OZfmFourmile Gneiss
    OZfmqFourmile Gneiss
    OZfmuFourmile Gneiss
    OZmMarlboro Formation
    OZmaMassabesic Gneiss Complex
    OZmgMarlboro Formation
    OZmoMonson Gneiss
    OZmoaMonson Gneiss
    OZmouMonson Gneiss
    OZnNashoba Formation
    OZnbNashoba Formation
    OZqQuinebaug Formation
    OZshShawsheen Gneiss
    OZtTatnic Hill Formation
    OZtfTatnic Hill Formation
    OZtyTatnic Hill Formation
    OZuSerpentinized peridotite stocks
    PcmCoal Mine Brook Formation
    PdDighton Conglomerate
    PgrMassive to weakly foliated, pink and gray, fine- to medium-grained biotite granite
    PhHarvard Conglomerate
    PpPondville Conglomerate
    PrRhode Island Formation
    PrcRhode Island Formation
    PwWamsutta Formation
    PwvWamsutta Formation
    PZbBellingham Conglomerate
    PzZcCambridge Argillite
    PzZrRoxbury Conglomerate
    PzZrbRoxbury Conglomerate
    qMassive quartz and silicified rock
    qdQuartz diorite
    SacgrAyer Granite, Clinton facies
    SagrAyer Granite
    SbBerwick Formation
    SbsBerwick Formation
    ScClough Quartzite
    SeEliot Formation
    SfFitch Formation
    SfsFitch Formation
    SfssFitch Formation
    SgrOrange-pink, rusty-weathering, medium- to coarse-grained biotite granite to granodiorite
    SngrNewburyport Complex
    SoOakdale Formation
    SOadAyer Granite
    SOagrAndover Granite
    SObgrBlue Hill Granite Porphyry
    SOboBoylston Schist
    SOcbCape Ann Complex
    SOcgrCape Ann Complex
    SOcsmCape Ann Complex
    SOkKittery Formation
    SOngdNewburyport Complex
    SOqgrQuincy Granite
    SOrhReubens Hill Formation
    SOvhVaughn Hills Quartzite
    SpPaxton Formation
    SpaPaxton Formation
    SpbcPaxton Formation
    SpbsPaxton Formation
    SpqrPaxton Formation
    SpsoPaxton Formation
    SpsqPaxton Formation
    SpssPaxton Formation
    SrRussell Mountain Formation
    SsaqdStraw Hollow Diorite and Assabet Quartz Diorite undifferentiated
    SsqdSharpners Pond Diorite
    StTower Hill Quartzite
    StsTower Hill Quartzite
    SZtbTadmuck Brook Schist
    TTertiary sediments
    TreRed arkosic conglomerate, sandstone, and siltstone
    TrnNew Haven Arkose
    TRsSugarloaf Formation
    uSerpentinite and/or talc rock
    YaMassive amphibolite of uncertain age
    YagBlack and white, well-layered hornblende-biotite-plagioclase gneiss and amphibolite
    YbGray, well-layered biotite-plagioclase-quartz gneiss
    YbuGray, well-layered biotite-plagioclase-quartz gneiss
    YcsCalc-silicate granofels and gneiss
    YfgPinkish-gray, fine-grained, well-laminated felsic biotite-microcline-plagioclase-quartz gneiss
    YggGranitoid Gneiss
    YhbWell-layered hornblende-biotite gneiss
    YlLee Gneiss
    YsgStamford Granite Gneiss
    YsmSherman Marble
    YtgTyringham Gneiss
    YwWashington Gneiss
    YwbWashington Gneiss
    YwcsWashington Gneiss
    YwhgWashington Gneiss
    ZbBlackstone Group
    ZbqBlackstone Group
    ZbsBlackstone Group
    ZbvBlackstone Group
    ZdBiotite-hornblende mafic dikes
    ZdgrDedham Granite
    ZdhDry Hill Gneiss
    ZdhsDry Hill Gneiss
    ZdigbDiorite and gabbro
    ZdngrDedham Granite
    ZdpqDry Hill Gneiss
    ZegrEsmond Granite
    ZfgrGranite of the Fall River pluton
    ZfmFelsic and mafic volcanic rocks
    ZggGranite, gneiss, and schist, undivided
    ZgmgdGrant Mills Granodiorite
    ZgnBiotite gneiss near New Bedford
    ZgrBiotite granite
    ZgsGneiss and schist near New Bedford
    ZhgHope Valley Alaskite Gneiss
    ZmMattapan Volcanic Complex
    ZmgdMilford granite
    ZmgrMilford granite
    ZmmMount Mineral Formation
    ZmmuMount Mineral Formation
    ZpPlainfield Formation
    ZpdUndifferentiated Poplar Mountain and Dry Hill Gneisses
    ZpgPonaganset Gneiss
    ZpgrPorphyritic granite
    ZpmPoplar Mountain Gneiss
    ZpmgPoplar Mountain Gneiss
    ZpmqPoplar Mountain Gneiss
    ZrdiDiorite at Rowley
    ZsgScituate Granite Gneiss
    ZssySharon Syenite
    ZtgdTopsfield Granodiorite
    ZvMetamorphosed mafic to felsic flow, and volcaniclastic and hypabyssal intrusive rocks
    ZvfMetamorphosed felsic metavolcanic rocks
    ZwWestboro Formation
    ZwgrWestwood Granite
    orig_label + ;n where n= province number (n=0 if no province number)

    type: character width: 16 output width: 16 (Source: Doug Stoeser (USGS))
    am;0Belchertown Complex
    CAbw;0Braintree Argillite and Weymouth Formation
    CAc;0Cheshire Quartzite
    CAg;0Green Lodge Formation of Rhodes and Graves
    CAh;0Hoppin Formation
    CAhh;0Hatch Hill Formation
    CAsa;0Stockbridge Formation
    CAsb;0Stockbridge Formation
    CAsc;0Stockbridge Formation
    CAZcm;0Canaan Mountain Formation
    CAZd;0Dalton Formation
    CAZdbs;0Dalton Formation
    CAZdc;0Dalton Formation
    CAZdg;0Dalton Formation
    CAZdq;0Dalton Formation
    CAZds;0Dalton Formation
    CAZev;0Everett Formation
    CAZevc;0Everett Formation
    CAZg;0Greylock Schist
    CAZga;0Greylock Schist
    CAZh;0Hoosac Formation
    CAZha;0Hoosac Formation
    CAZhd;0Hoosac Formation
    CAZhda;0Hoosac Formation
    CAZhdc;0Hoosac Formation
    CAZhg;0Hoosac Formation
    CAZhga;0Hoosac Formation
    CAZhgt;0Hoosac Formation
    CAZhk;0Hoosac Formation
    CAZhr;0Hoosac Formation
    CAZhw;0Hoosac Formation
    CAZn;0Nassau Formation
    CAZna;0Nassau Formation
    CAZngy;0Nassau Formation
    CAZnp;0Nassau Formation
    CAZnr;0Nassau Formation
    CAZnv;0Nassau Formation
    CAZw+n;0West Castleton and Nassau Formations, undivided
    Dbd;0Belchertown Complex
    Dbh;0Belchertown Complex
    Dbi;0Belchertown Complex
    Dbmd;0Belchertown Complex
    Dbmdg;0Belchertown Complex
    Dbmdt;0Belchertown Complex
    Dbp;0Belchertown Complex
    Dbt;0Belchertown Complex
    Dcgr;0Chelmsford Granite
    Dchgr;0Coys Hill Porphyritic Granite Gneiss
    Dchh;0Coys Hill Porphyritic Granite Gneiss
    Dcygr;0Cherry Hill Granite
    Ddi;0Biotite-hornblende diorite and quartz-bearing diorite
    Ddn;0Meladiorite and norite
    De;0Erving Formation
    Dea;0Erving Formation
    Deg;0Erving Formation
    Dev;0Erving Formation
    Dfgd;0Fitchburg Complex
    Dfgds;0Fitchburg Complex
    Dfgr;0Fitchburg Complex
    Dfgrg;0Fitchburg Complex
    Dft;0Fitchburg Complex
    Dg;0Goshen Formation
    Dgc;0Goshen Formation
    Dgl;0Goshen Formation
    Dgm;0Gile Mountain Formation
    Dgma;0Gile Mountain Formation
    Dgmq;0Gile Mountain Formation
    Dgp;0Goshen Formation
    Dgq;0Goshen Formation
    Dgr;0Biotite-muscovite granite
    Dgu;0Goshen Formation
    Dhgr;0Hardwick Tonalite
    Dht;0Hardwick Tonalite
    di;0Fine-grained hornblende diorite
    Dl;0Littleton Formation
    Dl+Ops;0Intimately interfolded Littleton and Partridge Formations
    Dlf;0Littleton Formation
    Dlm;0Littleton Formation
    Dlo;0Littleton Formation
    Dmg;0Middlefield Granite
    Dmgr;0Muscovite-bearing granite
    DOgr;0Alkalic granite in Franklin
    Dpe;0Feldspar-quartz-muscovite pegmatite
    Dpgb;0Prescott Complex
    Dpgg;0Cooleyville Granitic Gneiss
    Dpgr;0Peabody Granite
    Dpv;0Putney Volcanics
    Drgr;0Granite of Rattlesnake Hill pluton
    Drh;0Biotite-garnet-feldspar gneiss of Ragged Hill
    DSdi;0Diorite and tonalite
    DSn;0Newbury Volcanic Complex
    DSna;0Newbury Volcanic Complex
    DSnl;0Newbury Volcanic Complex
    DSnr;0Newbury Volcanic Complex
    DSnu;0Newbury Volcanic Complex
    DSw;0Worcester Formation
    Dw;0Waits River Formation
    Dwa;0Waits River Formation
    Dwgd;0Williamsburg Granodiorite
    Dwm;0Wenham Monzonite
    Dwt;0Waits River Formation
    DZl;0Lynn Volcanic Complex
    fgr;0Fine-grained granite and granite porphyry
    gb;0Hornblende-olivine gabbro
    gf;0Belchertown Complex
    grg;0Biotite granitic gneiss
    hg;0Hornblende-plagioclase gneiss
    igd;0Granodiorite of the Indian Head pluton
    Jd;0Diabase dikes and sills
    Jdb;0Deerfield Basalt
    Je;0East Berlin Formation
    Jec;0East Berlin Formation
    Jfg;0Mylonite along Connecticut Valley border fault
    Jgb;0Granby Basaltic Tuff
    Jhab;0Hampden Basalt
    Jhb;0Holyoke Basalt
    Jhv;0Hitchcock Volcanics
    Jm;0Mount Toby Formation
    Jma;0Mount Toby Formation
    Jmc;0Mount Toby Formation
    Jmg;0Mount Toby Formation
    Jn;0New Haven Arkose
    Jp;0Portland Formation
    Jpc;0Portland Formation
    Js;0Sugarloaf Formation
    Jsc;0Sugarloaf Formation
    Jsi;0Silicified fault-breccia or strongly silicified metamorphic rocks
    Jsm;0Shuttle Meadow Formation
    Jsmc;0Shuttle Meadow Formation
    Jt;0Turner Falls Sandstone
    Jtc;0Turner Falls Sandstone
    K;0Cretaceous sediments
    mgr;0Light-gray muscovite granite
    Oa;0Ammonoosuc Volcanics
    Oagl;0Austin Glen Graywacke
    Oaq;0Ammonoosuc Volcanics
    Oau;0Ammonoosuc Volcanics
    Oca;0Cobble Mountain Formation
    Ocar;0Cobble Mountain Formation
    OCAr;0Rowe Schist
    OCAra;0Rowe Schist
    OCArc;0Rowe Schist
    Ocb;0Cobble Mountain Formation
    Ocbr;0Cobble Mountain Formation
    Occ;0Cobble Mountain Formation
    Occa;0Cobble Mountain Formation
    Occr;0Cobble Mountain Formation
    Ocd;0Cobble Mountain Formation
    Oco;0Collinsville Formation
    Ocoa;0Collinsville Formation
    Ocoa1;0Collinsville Formation
    Ocoa2;0Collinsville Formation
    Ocoa3;0Collinsville Formation
    Ococ;0Collinsville Formation
    Ocof;0Collinsville Formation
    Ocog;0Collinsville Formation
    Ocor;0Collinsville Formation
    Ocu;0Cobble Mountain Formation
    Od;0Diorite at Goff Ledges
    Ogd;0Diorite at Goff Ledges
    Ogl;0Glastonbury Gneiss
    Ogr;0White to gray and black-spotted muscovite-biotite granite and granodiorite
    Oh;0Hawley Formation
    Ohb;0Hawley Formation
    Ohf;0Hawley Formation
    Ohg;0Hawley Formation
    Ohp;0Hawley Formation
    Ohpg;0Gneiss at Hallockville Pond
    Om;0Moretown Formation
    Oma;0Moretown Formation
    Omal;0Moretown Formation
    Oms;0Moretown Formation
    Omsc;0Moretown Formation
    Omsk;0Moretown Formation
    Ongb;0Nahant Gabbro and gabbro at Salem Neck
    Opa;0Partridge Formation
    Opau;0Partridge Formation
    Opbg;0Partridge Formation
    Opc;0Pauchaug Gneiss
    Opf;0Partridge Formation
    Opo;0Poultney Formation
    Ops;0Partridge Formation
    Opsa;0Partridge Formation
    Opsc;0Partridge Formation
    Opsg;0Partridge Formation
    Opu;0Partridge Formation
    Opv;0Partridge Formation
    Opvs;0Partridge Formation
    Osd;0Stockbridge Formation
    Ose;0Stockbridge Formation
    Osf;0Stockbridge Formation
    Osg;0Stockbridge Formation
    Otb;0Tectonic breccia
    Otbl;0Tectonic breccia
    Otr;0White, magnetite-bearing alaskite and trondhjemite
    Ow;0Walloomsac Formation
    Owl;0Walloomsac Formation
    Owm;0Walloomsac Formation
    Owq;0Walloomsac Formation
    OZf;0Fish Brook Gneiss
    OZfm;0Fourmile Gneiss
    OZfmq;0Fourmile Gneiss
    OZfmu;0Fourmile Gneiss
    OZm;0Marlboro Formation
    OZma;0Massabesic Gneiss Complex
    OZmg;0Marlboro Formation
    OZmo;0Monson Gneiss
    OZmoa;0Monson Gneiss
    OZmou;0Monson Gneiss
    OZn;0Nashoba Formation
    OZnb;0Nashoba Formation
    OZq;0Quinebaug Formation
    OZsh;0Shawsheen Gneiss
    OZt;0Tatnic Hill Formation
    OZtf;0Tatnic Hill Formation
    OZty;0Tatnic Hill Formation
    OZu;0Serpentinized peridotite stocks
    PAcm;0Coal Mine Brook Formation
    PAd;0Dighton Conglomerate
    PAgr;0Massive to weakly foliated, pink and gray, fine- to medium-grained biotite granite
    PAh;0Harvard Conglomerate
    PAp;0Pondville Conglomerate
    PAr;0Rhode Island Formation
    PArc;0Rhode Island Formation
    PAw;0Wamsutta Formation
    PAwv;0Wamsutta Formation
    PAZb;0Bellingham Conglomerate
    PZZc;0Cambridge Argillite
    PZZr;0Roxbury Conglomerate
    PZZrb;0Roxbury Conglomerate
    q;0Massive quartz and silicified rock
    qd;0Quartz diorite
    Sacgr;0Ayer Granite, Clinton facies
    Sagr;0Ayer Granite
    Sb;0Berwick Formation
    Sbs;0Berwick Formation
    Sc;0Clough Quartzite
    Se;0Eliot Formation
    Sf;0Fitch Formation
    Sfs;0Fitch Formation
    Sfss;0Fitch Formation
    Sgr;0Orange-pink, rusty-weathering, medium- to coarse-grained biotite granite to granodiorite
    Sngr;0Newburyport Complex
    So;0Oakdale Formation
    SOad;0Ayer Granite
    SOagr;0Andover Granite
    SObgr;0Blue Hill Granite Porphyry
    SObo;0Boylston Schist
    SOcb;0Cape Ann Complex
    SOcgr;0Cape Ann Complex
    SOcsm;0Cape Ann Complex
    SOk;0Kittery Formation
    SOngd;0Newburyport Complex
    SOqgr;0Quincy Granite
    SOrh;0Reubens Hill Formation
    SOvh;0Vaughn Hills Quartzite
    Sp;0Paxton Formation
    Spa;0Paxton Formation
    Spbc;0Paxton Formation
    Spbs;0Paxton Formation
    Spqr;0Paxton Formation
    Spso;0Paxton Formation
    Spsq;0Paxton Formation
    Spss;0Paxton Formation
    Sr;0Russell Mountain Formation
    Ssaqd;0Straw Hollow Diorite and Assabet Quartz Diorite undifferentiated
    Ssqd;0Sharpners Pond Diorite
    St;0Tower Hill Quartzite
    Sts;0Tower Hill Quartzite
    SZtb;0Tadmuck Brook Schist
    T;0Tertiary sediments
    TRe;0Red arkosic conglomerate, sandstone, and siltstone
    TRn;0New Haven Arkose
    TRs;0Sugarloaf Formation
    u;0Serpentinite and/or talc rock
    Ya;0Massive amphibolite of uncertain age
    Yag;0Black and white, well-layered hornblende-biotite-plagioclase gneiss and amphibolite
    Yb;0Gray, well-layered biotite-plagioclase-quartz gneiss
    Ybu;0Gray, well-layered biotite-plagioclase-quartz gneiss
    Ycs;0Calc-silicate granofels and gneiss
    Yfg;0Pinkish-gray, fine-grained, well-laminated felsic biotite-microcline-plagioclase-quartz gneiss
    Ygg;0Granitoid Gneiss
    Yhb;0Well-layered hornblende-biotite gneiss
    Yl;0Lee Gneiss
    Ysg;0Stamford Granite Gneiss
    Ysm;0Sherman Marble
    Ytg;0Tyringham Gneiss
    Yw;0Washington Gneiss
    Ywb;0Washington Gneiss
    Ywcs;0Washington Gneiss
    Ywhg;0Washington Gneiss
    Zb;0Blackstone Group
    Zbq;0Blackstone Group
    Zbs;0Blackstone Group
    Zbv;0Blackstone Group
    Zd;0Biotite-hornblende mafic dikes
    Zdgr;0Dedham Granite
    Zdh;0Dry Hill Gneiss
    Zdhs;0Dry Hill Gneiss
    Zdigb;0Diorite and gabbro
    Zdngr;0Dedham Granite
    Zdpq;0Dry Hill Gneiss
    Zegr;0Esmond Granite
    Zfgr;0Granite of the Fall River pluton
    Zfm;0Felsic and mafic volcanic rocks
    Zgg;0Granite, gneiss, and schist, undivided
    Zgmgd;0Grant Mills Granodiorite
    Zgn;0Biotite gneiss near New Bedford
    Zgr;0Biotite granite
    Zgs;0Gneiss and schist near New Bedford
    Zhg;0Hope Valley Alaskite Gneiss
    Zm;0Mattapan Volcanic Complex
    Zmgd;0Milford granite
    Zmgr;0Milford granite
    Zmm;0Mount Mineral Formation
    Zmmu;0Mount Mineral Formation
    Zp;0Plainfield Formation
    Zpd;0Undifferentiated Poplar Mountain and Dry Hill Gneisses
    Zpg;0Ponaganset Gneiss
    Zpgr;0Porphyritic granite
    Zpm;0Poplar Mountain Gneiss
    Zpmg;0Poplar Mountain Gneiss
    Zpmq;0Poplar Mountain Gneiss
    Zrdi;0Diorite at Rowley
    Zsg;0Scituate Granite Gneiss
    Zssy;0Sharon Syenite
    Ztgd;0Topsfield Granodiorite
    Zv;0Metamorphosed mafic to felsic flow, and volcaniclastic and hypabyssal intrusive rocks
    Zvf;0Metamorphosed felsic metavolcanic rocks
    Zw;0Westboro Formation
    Zwgr;0Westwood Granite
    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))
    MAam;0Belchertown Complex
    MACAbw;0Braintree Argillite and Weymouth Formation
    MACAc;0Cheshire Quartzite
    MACAg;0Green Lodge Formation of Rhodes and Graves
    MACAh;0Hoppin Formation
    MACAhh;0Hatch Hill Formation
    MACAsa;0Stockbridge Formation
    MACAsb;0Stockbridge Formation
    MACAsc;0Stockbridge Formation
    MACAZcm;0Canaan Mountain Formation
    MACAZd;0Dalton Formation
    MACAZdbs;0Dalton Formation
    MACAZdc;0Dalton Formation
    MACAZdg;0Dalton Formation
    MACAZdq;0Dalton Formation
    MACAZds;0Dalton Formation
    MACAZev;0Everett Formation
    MACAZevc;0Everett Formation
    MACAZg;0Greylock Schist
    MACAZga;0Greylock Schist
    MACAZh;0Hoosac Formation
    MACAZha;0Hoosac Formation
    MACAZhd;0Hoosac Formation
    MACAZhda;0Hoosac Formation
    MACAZhdc;0Hoosac Formation
    MACAZhg;0Hoosac Formation
    MACAZhga;0Hoosac Formation
    MACAZhgt;0Hoosac Formation
    MACAZhk;0Hoosac Formation
    MACAZhr;0Hoosac Formation
    MACAZhw;0Hoosac Formation
    MACAZn;0Nassau Formation
    MACAZna;0Nassau Formation
    MACAZngy;0Nassau Formation
    MACAZnp;0Nassau Formation
    MACAZnr;0Nassau Formation
    MACAZnv;0Nassau Formation
    MACAZw+n;0West Castleton and Nassau Formations, undivided
    MADbd;0Belchertown Complex
    MADbh;0Belchertown Complex
    MADbi;0Belchertown Complex
    MADbmd;0Belchertown Complex
    MADbmdg;0Belchertown Complex
    MADbmdt;0Belchertown Complex
    MADbp;0Belchertown Complex
    MADbt;0Belchertown Complex
    MADcgr;0Chelmsford Granite
    MADchgr;0Coys Hill Porphyritic Granite Gneiss
    MADchh;0Coys Hill Porphyritic Granite Gneiss
    MADcygr;0Cherry Hill Granite
    MADdi;0Biotite-hornblende diorite and quartz-bearing diorite
    MADdn;0Meladiorite and norite
    MADe;0Erving Formation
    MADea;0Erving Formation
    MADeg;0Erving Formation
    MADev;0Erving Formation
    MADfgd;0Fitchburg Complex
    MADfgds;0Fitchburg Complex
    MADfgr;0Fitchburg Complex
    MADfgrg;0Fitchburg Complex
    MADft;0Fitchburg Complex
    MADg;0Goshen Formation
    MADgc;0Goshen Formation
    MADgl;0Goshen Formation
    MADgm;0Gile Mountain Formation
    MADgma;0Gile Mountain Formation
    MADgmq;0Gile Mountain Formation
    MADgp;0Goshen Formation
    MADgq;0Goshen Formation
    MADgr;0Biotite-muscovite granite
    MADgu;0Goshen Formation
    MADhgr;0Hardwick Tonalite
    MADht;0Hardwick Tonalite
    MAdi;0Fine-grained hornblende diorite
    MADl;0Littleton Formation
    MADl+Ops;0Intimately interfolded Littleton and Partridge Formations
    MADlf;0Littleton Formation
    MADlm;0Littleton Formation
    MADlo;0Littleton Formation
    MADmg;0Middlefield Granite
    MADmgr;0Muscovite-bearing granite
    MADOgr;0Alkalic granite in Franklin
    MADpe;0Feldspar-quartz-muscovite pegmatite
    MADpgb;0Prescott Complex
    MADpgg;0Cooleyville Granitic Gneiss
    MADpgr;0Peabody Granite
    MADpv;0Putney Volcanics
    MADrgr;0Granite of Rattlesnake Hill pluton
    MADrh;0Biotite-garnet-feldspar gneiss of Ragged Hill
    MADSdi;0Diorite and tonalite
    MADSn;0Newbury Volcanic Complex
    MADSna;0Newbury Volcanic Complex
    MADSnl;0Newbury Volcanic Complex
    MADSnr;0Newbury Volcanic Complex
    MADSnu;0Newbury Volcanic Complex
    MADSw;0Worcester Formation
    MADw;0Waits River Formation
    MADwa;0Waits River Formation
    MADwgd;0Williamsburg Granodiorite
    MADwm;0Wenham Monzonite
    MADwt;0Waits River Formation
    MADZl;0Lynn Volcanic Complex
    MAfgr;0Fine-grained granite and granite porphyry
    MAgb;0Hornblende-olivine gabbro
    MAgf;0Belchertown Complex
    MAgrg;0Biotite granitic gneiss
    MAhg;0Hornblende-plagioclase gneiss
    MAigd;0Granodiorite of the Indian Head pluton
    MAJd;0Diabase dikes and sills
    MAJdb;0Deerfield Basalt
    MAJe;0East Berlin Formation
    MAJec;0East Berlin Formation
    MAJfg;0Mylonite along Connecticut Valley border fault
    MAJgb;0Granby Basaltic Tuff
    MAJhab;0Hampden Basalt
    MAJhb;0Holyoke Basalt
    MAJhv;0Hitchcock Volcanics
    MAJm;0Mount Toby Formation
    MAJma;0Mount Toby Formation
    MAJmc;0Mount Toby Formation
    MAJmg;0Mount Toby Formation
    MAJn;0New Haven Arkose
    MAJp;0Portland Formation
    MAJpc;0Portland Formation
    MAJs;0Sugarloaf Formation
    MAJsc;0Sugarloaf Formation
    MAJsi;0Silicified fault-breccia or strongly silicified metamorphic rocks
    MAJsm;0Shuttle Meadow Formation
    MAJsmc;0Shuttle Meadow Formation
    MAJt;0Turner Falls Sandstone
    MAJtc;0Turner Falls Sandstone
    MAK;0Cretaceous sediments
    MAmgr;0Light-gray muscovite granite
    MAOa;0Ammonoosuc Volcanics
    MAOagl;0Austin Glen Graywacke
    MAOaq;0Ammonoosuc Volcanics
    MAOau;0Ammonoosuc Volcanics
    MAOca;0Cobble Mountain Formation
    MAOcar;0Cobble Mountain Formation
    MAOCAr;0Rowe Schist
    MAOCAra;0Rowe Schist
    MAOCArc;0Rowe Schist
    MAOcb;0Cobble Mountain Formation
    MAOcbr;0Cobble Mountain Formation
    MAOcc;0Cobble Mountain Formation
    MAOcca;0Cobble Mountain Formation
    MAOccr;0Cobble Mountain Formation
    MAOcd;0Cobble Mountain Formation
    MAOco;0Collinsville Formation
    MAOcoa;0Collinsville Formation
    MAOcoa1;0Collinsville Formation
    MAOcoa2;0Collinsville Formation
    MAOcoa3;0Collinsville Formation
    MAOcoc;0Collinsville Formation
    MAOcof;0Collinsville Formation
    MAOcog;0Collinsville Formation
    MAOcor;0Collinsville Formation
    MAOcu;0Cobble Mountain Formation
    MAOd;0Diorite at Goff Ledges
    MAOgd;0Diorite at Goff Ledges
    MAOgl;0Glastonbury Gneiss
    MAOgr;0White to gray and black-spotted muscovite-biotite granite and granodiorite
    MAOh;0Hawley Formation
    MAOhb;0Hawley Formation
    MAOhf;0Hawley Formation
    MAOhg;0Hawley Formation
    MAOhp;0Hawley Formation
    MAOhpg;0Gneiss at Hallockville Pond
    MAOm;0Moretown Formation
    MAOma;0Moretown Formation
    MAOmal;0Moretown Formation
    MAOms;0Moretown Formation
    MAOmsc;0Moretown Formation
    MAOmsk;0Moretown Formation
    MAOngb;0Nahant Gabbro and gabbro at Salem Neck
    MAOpa;0Partridge Formation
    MAOpau;0Partridge Formation
    MAOpbg;0Partridge Formation
    MAOpc;0Pauchaug Gneiss
    MAOpf;0Partridge Formation
    MAOpo;0Poultney Formation
    MAOps;0Partridge Formation
    MAOpsa;0Partridge Formation
    MAOpsc;0Partridge Formation
    MAOpsg;0Partridge Formation
    MAOpu;0Partridge Formation
    MAOpv;0Partridge Formation
    MAOpvs;0Partridge Formation
    MAOsd;0Stockbridge Formation
    MAOse;0Stockbridge Formation
    MAOsf;0Stockbridge Formation
    MAOsg;0Stockbridge Formation
    MAOtb;0Tectonic breccia
    MAOtbl;0Tectonic breccia
    MAOtr;0White, magnetite-bearing alaskite and trondhjemite
    MAOw;0Walloomsac Formation
    MAOwl;0Walloomsac Formation
    MAOwm;0Walloomsac Formation
    MAOwq;0Walloomsac Formation
    MAOZf;0Fish Brook Gneiss
    MAOZfm;0Fourmile Gneiss
    MAOZfmq;0Fourmile Gneiss
    MAOZfmu;0Fourmile Gneiss
    MAOZm;0Marlboro Formation
    MAOZma;0Massabesic Gneiss Complex
    MAOZmg;0Marlboro Formation
    MAOZmo;0Monson Gneiss
    MAOZmoa;0Monson Gneiss
    MAOZmou;0Monson Gneiss
    MAOZn;0Nashoba Formation
    MAOZnb;0Nashoba Formation
    MAOZq;0Quinebaug Formation
    MAOZsh;0Shawsheen Gneiss
    MAOZt;0Tatnic Hill Formation
    MAOZtf;0Tatnic Hill Formation
    MAOZty;0Tatnic Hill Formation
    MAOZu;0Serpentinized peridotite stocks
    MAPAcm;0Coal Mine Brook Formation
    MAPAd;0Dighton Conglomerate
    MAPAgr;0Massive to weakly foliated, pink and gray, fine- to medium-grained biotite granite
    MAPAh;0Harvard Conglomerate
    MAPAp;0Pondville Conglomerate
    MAPAr;0Rhode Island Formation
    MAPArc;0Rhode Island Formation
    MAPAw;0Wamsutta Formation
    MAPAwv;0Wamsutta Formation
    MAPAZb;0Bellingham Conglomerate
    MAPZZc;0Cambridge Argillite
    MAPZZr;0Roxbury Conglomerate
    MAPZZrb;0Roxbury Conglomerate
    MAq;0Massive quartz and silicified rock
    MAqd;0Quartz diorite
    MASacgr;0Ayer Granite, Clinton facies
    MASagr;0Ayer Granite
    MASb;0Berwick Formation
    MASbs;0Berwick Formation
    MASc;0Clough Quartzite
    MASe;0Eliot Formation
    MASf;0Fitch Formation
    MASfs;0Fitch Formation
    MASfss;0Fitch Formation
    MASgr;0Orange-pink, rusty-weathering, medium- to coarse-grained biotite granite to granodiorite
    MASngr;0Newburyport Complex
    MASo;0Oakdale Formation
    MASOad;0Ayer Granite
    MASOagr;0Andover Granite
    MASObgr;0Blue Hill Granite Porphyry
    MASObo;0Boylston Schist
    MASOcb;0Cape Ann Complex
    MASOcgr;0Cape Ann Complex
    MASOcsm;0Cape Ann Complex
    MASOk;0Kittery Formation
    MASOngd;0Newburyport Complex
    MASOqgr;0Quincy Granite
    MASOrh;0Reubens Hill Formation
    MASOvh;0Vaughn Hills Quartzite
    MASp;0Paxton Formation
    MASpa;0Paxton Formation
    MASpbc;0Paxton Formation
    MASpbs;0Paxton Formation
    MASpqr;0Paxton Formation
    MASpso;0Paxton Formation
    MASpsq;0Paxton Formation
    MASpss;0Paxton Formation
    MASr;0Russell Mountain Formation
    MASsaqd;0Straw Hollow Diorite and Assabet Quartz Diorite undifferentiated
    MASsqd;0Sharpners Pond Diorite
    MASt;0Tower Hill Quartzite
    MASts;0Tower Hill Quartzite
    MASZtb;0Tadmuck Brook Schist
    MAT;0Tertiary sediments
    MATRe;0Red arkosic conglomerate, sandstone, and siltstone
    MATRn;0New Haven Arkose
    MATRs;0Sugarloaf Formation
    MAu;0Serpentinite and/or talc rock
    MAYa;0Massive amphibolite of uncertain age
    MAYag;0Black and white, well-layered hornblende-biotite-plagioclase gneiss and amphibolite
    MAYb;0Gray, well-layered biotite-plagioclase-quartz gneiss
    MAYbu;0Gray, well-layered biotite-plagioclase-quartz gneiss
    MAYcs;0Calc-silicate granofels and gneiss
    MAYfg;0Pinkish-gray, fine-grained, well-laminated felsic biotite-microcline-plagioclase-quartz gneiss
    MAYgg;0Granitoid Gneiss
    MAYhb;0Well-layered hornblende-biotite gneiss
    MAYl;0Lee Gneiss
    MAYsg;0Stamford Granite Gneiss
    MAYsm;0Sherman Marble
    MAYtg;0Tyringham Gneiss
    MAYw;0Washington Gneiss
    MAYwb;0Washington Gneiss
    MAYwcs;0Washington Gneiss
    MAYwhg;0Washington Gneiss
    MAZb;0Blackstone Group
    MAZbq;0Blackstone Group
    MAZbs;0Blackstone Group
    MAZbv;0Blackstone Group
    MAZd;0Biotite-hornblende mafic dikes
    MAZdgr;0Dedham Granite
    MAZdh;0Dry Hill Gneiss
    MAZdhs;0Dry Hill Gneiss
    MAZdigb;0Diorite and gabbro
    MAZdngr;0Dedham Granite
    MAZdpq;0Dry Hill Gneiss
    MAZegr;0Esmond Granite
    MAZfgr;0Granite of the Fall River pluton
    MAZfm;0Felsic and mafic volcanic rocks
    MAZgg;0Granite, gneiss, and schist, undivided
    MAZgmgd;0Grant Mills Granodiorite
    MAZgn;0Biotite gneiss near New Bedford
    MAZgr;0Biotite granite
    MAZgs;0Gneiss and schist near New Bedford
    MAZhg;0Hope Valley Alaskite Gneiss
    MAZm;0Mattapan Volcanic Complex
    MAZmgd;0Milford granite
    MAZmgr;0Milford granite
    MAZmm;0Mount Mineral Formation
    MAZmmu;0Mount Mineral Formation
    MAZp;0Plainfield Formation
    MAZpd;0Undifferentiated Poplar Mountain and Dry Hill Gneisses
    MAZpg;0Ponaganset Gneiss
    MAZpgr;0Porphyritic granite
    MAZpm;0Poplar Mountain Gneiss
    MAZpmg;0Poplar Mountain Gneiss
    MAZpmq;0Poplar Mountain Gneiss
    MAZrdi;0Diorite at Rowley
    MAZsg;0Scituate Granite Gneiss
    MAZssy;0Sharon Syenite
    MAZtgd;0Topsfield Granodiorite
    MAZv;0Metamorphosed mafic to felsic flow, and volcaniclastic and hypabyssal intrusive rocks
    MAZvf;0Metamorphosed felsic metavolcanic rocks
    MAZw;0Westboro Formation
    MAZwgr;0Westwood Granite
    An alphanumeric code (e.g. US001) that designates the source material used.

    type: character width: 6 output width: 8 (Source: Doug Stoeser (USGS))
    MA001Unpublished digital map of Massachusetts (Rudi Hon at Boston College, 1998).
    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)
    The geologic age from the source map used.

    type: character width: 60 output width: 60 (Source: Doug Stoeser (USGS))
    Devonian and Silurian 
    Lower Cambrian 
    Lower Cambrian and Proterozoic Z 
    Lower Devonian 
    Lower Devonian and Middle Ordovician 
    Lower Devonian and Silurian 
    Lower Devonian and Upper Silurian 
    Lower Devonian or younger 
    Lower Devonian, Silurian, or Proterozoic Z 
    Lower Jurassic 
    Lower Ordovician 
    Lower Ordovician and Cambrian 
    Lower Ordovician and Proterozoic Z 
    Lower Pennsylvanian 
    Lower Silurian 
    Lower Silurian and Upper Ordovician 
    Lower Silurian and Upper Ordovician? 
    Lower Silurian or Upper Ordovician 
    Middle Devonian 
    Middle Ordovician 
    Middle Ordovician or older 
    Middle Pennsylvanian 
    Middle and Lower Cambrian 
    Middle and Lower Pennsylvanian 
    Ordovician and Proterozoic Z 
    Ordovician or Proterozoic Z 
    Ordovician to Proterozoic Z 
    Ordovician, Cambrian, or Proterozoic Z 
    Precambrian to Paleozoic 
    Precambrian to Phanerozoic 
    Precambrian to Silurian 
    Proterozoic Y 
    Proterozoic Z 
    Proterozoic Z or younger 
    Proterozoic Z to earliest Paleozoic 
    Silurian or Ordovician 
    Silurian?, Ordovician, or Proterozoic Z 
    Upper Cambrian 
    Upper Cambrian? 
    Upper Pennsylvanian 
    Upper Silurian 
    Upper Triassic 
    Upper and Middle Pennsylvanian 
    age uncertain 
    The predominant lithology found in the formation.

    type: character width: 40 output width: 40 (Source: Johnson Lith Class 6.1a)
    alkali-granite (alaskite) 
    amphibole schist 
    augen gneiss 
    biotite gneiss 
    calc-silicate rock 
    clay or mud 
    dolostone (dolomite) 
    felsic gneiss 
    felsic metavolcanic rock 
    granitic gneiss 
    mafic gneiss 
    mafic volcanic rock 
    metasedimentary rock 
    metavolcanic rock 
    mica schist 
    pelitic schist 
    quartz diorite 
    quartz monzodiorite 
    sedimentary breccia 
    sedimentary rock 
    tectonic breccia 
    ultramafic intrusive rock 
    volcanic breccia (agglomerate) 
    The second most predominant lithology in the formation.

    type: character width: 40 output width: 40 (Source: Johnson Lith Class 6.1)
    amphibole schist 
    biotite gneiss 
    calc-silicate rock 
    felsic gneiss 
    mafic gneiss 
    mafic volcanic rock 
    metamorphic rock 
    metasedimentary rock 
    mica schist 
    mixed clastic/volcanic 
    quartz diorite 
    quartz syenite 
    volcanic breccia (agglomerate) 
    volcanic rock 
    Arc attribute table for Massachusetts geologic coverage. (Source: ESRI)
    Unique identifier for the line feature

    type: integer width: 3 output width: 3 (Source: AAT data dictionary)
    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)
    6normal fault, location inferred, queried, 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, location certain, 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
    32fault, sense of displacement unknown or undefined, location inferred or queried
    35high-angle reverse fault, location certain, teeth on right from origin (angle of thrusting added to ARC-PARA1 where designated in source)
    124state boundary
    Used for "decorated" lines where additional information is needed.

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

    type: integer width: 3 output width: 3 (Source: AAT data dictionary)
    0no additional information
    1pre-meta thrust fault
    An alphanumeric code (e.g. US001) that designates the source material used.

    type: character width: 6 output width: 8 (Source: Doug Stoeser (USGS))
    MA001Unpublished digital map of Massachusetts (Rudi Hon at Boston College, 1998).
    MA101Source arcs were mistagged and have been corrected by C.L. Dicken.
    MA102Source arcs were in the wrong direction and have been “flipped” by C.L. Dicken.
    MA103Source arcs were mistagged and in the wrong direction and have been corrected and flipped by C.L. Dicken.
    MA104C.L.Dicken added one arc (polygon).
    MA201Mistagged polygons were corrected by C.L. Dicken, so digital file now conforms to paper map.
    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)
    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

    703-648-6344 (voice)

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?
    mageol (source 1 of 3)
    Hon, Rudolph, unpublished material, Digital Geologic Map of Massachusetts: unknown, Boston College.

    Online Links:

    • none

    Type_of_Source_Media: vector
    Source_Scale_Denominator: 250,000
    Source_Contribution: provided geology for state map
    state boundaries (source 2 of 3)
    Johnson, Bruce R., unpublished, 1:100,000 Scale State Boundaries of the Conterminous United States.

    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 3 of 3)
    Johnson, Bruce R., unpublished, Geologic Map Unit Classification, ver. 6.1.

    Document has been modified and is included in Appedices of the publication.
    Type_of_Source_Media: online; http:/
    Source_Scale_Denominator: none
    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: 2006 (process 2 of 10)
    C.L. Dicken obtained the digital geologic map of Massachusetts from Julia Mueller. 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 map_code. The values from map_code where then calculated into a new field called orig_label.
    Date: 2006 (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. MA001) 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: 2006 (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: 2006 (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: 2006 (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.

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

    Then it was unprojected into geographic coordinates and exported again (MAgeol_dd.e00).
    Date: 2006 (process 9 of 10)
    Faults were extracted from the coverage and created a separate fault coverage (MAfaults_lcc) and then exported (MAfaults_lcc.e00). File was unprojected into geographic coordinates (MAfaults_dd) and exported again (MAfaults_dd.e00).
    Date: 2006 (process 10 of 10)
    Finally, the geology lines, geology polygons, and faults 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:
  2. How accurate are the geographic locations?
    Accuracy of Massachusetts 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
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

    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:
    • Cost to order the data: none

Who wrote the metadata?

Last modified: 03-Apr-2006
Metadata author:
U.S. Geological Survey
Attn: Connie L. Dicken
12201 Sunrise Valley Dr. MS954
Reston, VA

703-648-6482 (voice)
Metadata standard:
Content Standard for Digital Geospatial Metadata (FGDC-STD-001-1998)

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