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Integrated Geologic Map Databases for the United States: Delaware, Maryland, New York, Pennsylvania, and Virginia

Frequently anticipated questions:

• What does this data set describe?
  1. How should this data set be cited?
  2. What geographic area does the data set cover?
  3. What does it look like?
  4. Does the data set describe conditions during a particular time period?
  5. What is the general form of this data set?
  6. How does the data set represent geographic features?
  7. How does the data set describe geographic features?
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What does this data set describe?

1. How should this data set be cited?

   Dicken, Connie L., Nicholson, Suzanne W., Horton, John D., Kinney, Scott A., Gunther, Gregory, Foose, Michael P., and Mueller, Julia A.L., 2005, Integrated Geologic Map Databases for the United States: Delaware, Maryland, New York, Pennsylvania, and Virginia: U.S. Geological Survey Open-File Report 2005-1325, U.S. Geological Survey, Reston, VA.

   Online Links:

   • <http://pubs.usgs.gov/of/2005/1325/>

2. What geographic area does the data set cover?

   West_Bounding_Coordinate: -83.675682

   East_Bounding_Coordinate: -75.097580

   North_Bounding_Coordinate: 39.465752

   South_Bounding_Coordinate: 36.535133

3. What does it look like?

4. Does the data set describe conditions during a particular time period?

   Calendar_Date: 2005

   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?

   VA_geol.pat

   Polygon attribute table for the Virginia geologic coverage. (Source: ESRI)

   ORIG_LABEL

   unmodified map unit symbol from source cover.

   type: character width: 12 output width: 12 (Source: Doug Stoeser)

   Value	Definition
   adg	Altered Diorite and Gabbro
   af	Artificial Fill
   ag	Abbeyville Gabbro
   ak	Alaskite
   al	Alluvium
   amr	Amphibolite and Amphibole-Bearing Gneiss and Schist
   basalt	Valley and Ridge Igneous Intrusions; Basalt
   bgd	Biotite Granodiorite
   bgp	Porphyroblastic Biotite Gneiss
   bgr	Burkeville Pluton
   bgs	Biotite Gneiss and Schist
   bmgl	Biotite-Muscovite Granite
   bo	Buffalo Granite
   [bg	Interlayered Mafic and Felsic Metavolcanic Rocks
   [c	Conasauga Shale
   [ca	Candler Formation
   [cas	Candler Formation
   [cfv	Chopawamsic Formation
   [ch	Chilhowee Group
   [cmv	Chopawamsic Formation
   [co	Conococheague Formation
   [cv	Chopawamsic Formation
   [d	Dale City Pluton
   [e	Elbrook Formation
   [eh	Erwin and Hampton Formations
   [ev	Everona Limestone
   [f	Frederick Limestone
   [fq	Interlayered Mafic and Felsic Metavolcanic Rocks
   [fv	Interlayered Mafic and Felsic Metavolcanic Rocks
   [fvs	Metavolcanic and Metasedimentary Rocks
   [g	Amphibolite
   [gi	Georgetown Intrusive Suite
   [i	Indian Run Formation
   [l	Lunga Reservoir Formation
   [lw	Leatherwood Granite
   [m	Melrose Granite
   [mv	Interlayered Mafic and Felsic Metavolcanic Rocks
   [mvs	Metavolcanic and Metasedimentary Rocks
   [nhk	Nolichucky and Honaker Formations
   [nmrr	Nolichucky and Maryville Formations, Rogersville Shale, and Rutledge Formation
   [p	Purcell Branch Formation
   [r	Rome Formation
   [ra	Rich Acres Formation
   [s	Shady Dolomite
   [sg	Interlayered Mafic and Felsic Metavolcanic Rocks
   [sv	Sykesville Formation
   [t	Tomstown Dolomite
   [ta	Ta River Metamorphic Suite
   [u	Unicoi Formation
   [wb	Waynesboro Formation
   [wbt	Waynesboro Formation and Tomstown Dolomite
   [y	Yorkshire Formation
   [Za	Annandale Group
   [Zba	Alligator Back Formation
   [Zac	Alligator Back Formation
   [Zas	Alligator Back Formation
   [Zba	Bassett Formation
   [Zc	Catoctin Formation
   [Zcb	Catoctin Formation
   [Zcr	Catoctin Formation
   [Zcs	Catoctin Formation
   [Zfm	Fork Mountain Formation
   [Zg	Garrisonville Mafic Complex
   [Zh	Holly Corner Gneiss
   [Zhb	Catoctin Formation
   [Zl	Annandale Group
   [Zlb	Catoctin Formation
   [Zmd	Metagabbro
   [Zmg	Mather Gorge Formation
   [Zmi	Mafic Igneous Complex Undivided
   [Zmq	Micaceous Quartzite
   [Zms	Mather Gorge Formation
   [Zmy	Alligator Back Formation
   [Zpb	Piney Branch Complex
   [Zpm	Metagraywacke, Quartzose Schist, and Melange
   [Zum	Ultramafic Rocks
   cm	Polygenetic Melange
   Db	Brallier Formation
   Dch	Chemung Formation
   dgn	Diorite Gneiss
   Dhs	Hampshire Formation
   di	Diorite and Quartz Diorite
   Dma	Mahantango Formation
   Dmn	Millboro Shale and Needmore Formation
   Dmrn	Marcellus Shale and Needmore Formation
   ds	Dune Sand
   DSOz	Lower Devonian, Silurian and Upper Ordovician Formations Undivided
   DSu	Ridgeley Sandstone, Helderberg and Cayugan Groups
   DSz	Lower Devonian and Silurian Formations Undivided
   Dx	Millboro Shale, Huntersville Chert, and Rocky Gap Sandstone
   fbgr	Foliated Biotite Granite
   fcm	Fine Creek Mills Granite
   fg	Gneissic Granite and Granodiorite
   fgb	Biotite Granite Gneiss
   fr	Flat Rock Granite
   g	Granite
   ga	Hornblende Gabbro
   gn	Gneiss
   gns	Gneiss and Schist
   gr	Granitoid Rocks
   grb	Biotite Granite
   grbi	Biotite Granite
   grc	Carysbrook Pluton
   grp	Porphyritic Granite
   grpo	Porphyritic Granite
   grt	Metatonalite
   gs	Actinolite Schist Metabasalt
   Jb	Newark Supergroup; Jurassic Basalt
   Jc	Newark Supergroup; Jurassic Conglomerate
   Jd	Diabase
   Jsh	Newark Supergroup; Jurassic Siltstone and Shale
   Jss	Newark Supergroup; Jurassic Interbedded Sandstone and Siltstone
   JTp	Valley and Ridge Igneous Intrusions; Peridotite
   Kp	Potomac Formation
   ks	Kyanite Schist
   lgn	Lineated Biotite Granite Gneiss
   ls	Candler Formation
   m	Marsh and Intertidal Mud Deposits
   Mbf	Bluefield Formation
   Mccf	Cove Creek Limestone and Fido Sandstone
   MDcw	Chattanooda Shale and Wildcat Valley Sandstone
   mf	Mafic Plutonic Rocks
   Mg	Greenbrier Limestone
   mgb	Metagabbro
   mgr	Metagraywacke
   Mm	Maccrady Shale
   Mmpr	Maccrady Shale and Price Formation
   Mp	Pennington Group
   Mpbg	Petersburg Granite
   mpg	Migmatitic Paragneiss
   Mpo	Pocono Formation
   Mpr	Price Formation
   msg	Miocene Sand and Gravel
   mss	Metasandstone and Metasiltstone
   my	Mylonite, Mylonite Gneiss, and Cataclastic Rocks
   Mz	Mississippian Formations Undivided
   nv	North View Pluton
   Oa	Arvonia Formation
   Oas	Arvonia Formation
   Ob	Beekmantown Group
   Obf	Buffards Formation
   Obi	Bear Island Granodiorite
   Obq	Arvonia Formation
   O[cc	Chepultepec and Copper Ridge Formations
   O[co	Conococheague Formation
   O[d	Dalecarlia Instrusive Suite
   O[f	Falls Church Intrusive Suite
   O[gg	Goldvein Pluton
   O[k	Knox Group
   O[o	Occoquan Granite
   O[p	Phyllite
   O[pg	Plagiogranite Tonalite
   O[po	Popes Head Formation
   O[ps	Popes Head Formation
   O[tj	Trondhjemite
   O[u	Metasedimentary Rocks Undivided
   O[z	Lower Ordovician and Upper Cambrian Formations Undivided
   Ocg	Columbia pluton
   Oeln	Edinburg Formation, Lincolnshire and New Market Limestones
   Okpl	Knobs Formation, Paperville Shale, Lenoir and Mosheim Limestone
   Okq	Arvonia Formation
   Ol	Lake Jackson Pluton
   Ola	Lahore Complex
   Olm	Lahore Complex
   Olp	Lahore Complex
   Ols	Moccasin or Bays Formation through Blackford Formation
   Om	Martinsburg and Oranda Formations
   Omk	Mascot and Kingsport Dolomites
   Oml	Hardy Creek Limestone through Dot Limestone
   Oq	Quantico Formation
   Oqq	Quantico Formation
   Ost	Shelton Formation
   Ot	Metatonalite
   Ou	Sequatchie Formation, Reedsville Shale, Trenton Limestone, Eggleston Formation
   Oun	Juniata, Oswego, Martinsburg (Reedsville and Dolly Ridge), and Eggleston Formations
   Ous	Juniata, Reedsville, Trenton, and Eggleston Formations
   Oz	Upper and Middle Ordovician Formations Undivided
   OZl	Mine Run Complex
   OZll	Mine Run Complex
   OZlll	Mine Run Complex
   @h	Harlan Sandstone
   @k	Kanawha Formation
   @l	Lee Formation
   @Mbi	Buggs Island Pluton
   @Mf	Falmouth Intrusive Suite
   @Ml	Lee Formation
   @n	Norton Formation
   @nr	New River Formation
   @p	Pocahontas Formation
   @w	Wise Formation
   @wg	Wise Formation and Gladeville Sandstone
   @z	Norton, New River, Lee and Pocahontas Formations Undivided
   pbg	Porphyroblastic Biotite Granite
   peg	Granite Pegmatite
   pg	Plagiogranite
   pgo	Pegmatite
   Ppg	Pegmatite
   psg	Pliocene Sand and Gravel
   py	Phyllonite
   Qc	Chuckatuck Formation
   Qcc	Charles City Formation
   Qj	Joynes Neck Sand
   Qk	Kent Island Formation
   Qnb	Nassawadox Formation
   Qno	Nassawadox Formation
   Qoa	Omar Formation
   Qsh	Shirley Formation
   Qt	Tabb Formation
   Qtl	Tabb Formation; Lynnhaven Member
   Qtlp	Tabb Formation: Lynnhaven and Poquoson Members
   Qtp	Tabb Formtaion; Poquoson Member
   Qts	Tabb Formation; Sedgefield Member
   QTu	Quaternary and Tertiary Deposits
   QTw	Windsor Formation
   Qwa	Wachapreague Formation
   rbg	Biotite Gneiss
   ro	Red Oak Pluton
   sb	Beach Sand and Dune Sand Deposits
   sch	Schist
   Sf	Falls Run Granite Gneiss
   Shrc	Hancock, Rose Hill, and Clinch Formations
   Skrt	Keefer, Rose Hill, and Tuscarora Formations
   Sm	Massanutten Sandstone
   SOe	Ellisville Biotite Granodiorite
   SOz	Silurian and Upper Ordovician Formations Undivided
   sp	Swamp Deposits
   Sz	Silurian Formations Undivided
   Tb1	Bacons Castle Formation
   Tb2	Bacons Castle Formation
   Tc	Chesapeake Group
   td	Terrace Deposits
   Tl	Lower Tertiary Deposits
   Tm	Moorings Unit of Oaks and Coch (1973)
   TRbr	Newark Supergroup; Breccia, mixed clasts
   TRbr1	Newark Supergroup; Breccia, mudstone clasts
   TRc	Newark Supergroup; Conglomerate, mixed clasts
   TRc1	Newark Supergroup; Conglomerate, limestone clasts
   TRc2	Newark Supergroup; Conglomerate, greenstone clasts
   TRc3	Newark Supergroup; Conglomerate, arkosic maatrix
   TRcs	Newark Supergroup; Triassic Sandstone, Siltstone, Shale, and Coal
   TRs	Newark Supergroup; Sandstone, undifferentiated
   TRs1	Newark Supergroup; Arkosic Sandstone
   TRsh	Newark Supergroup; Triassic shale and siltstone
   TRss	Newark Supergroup; Triassic Sandstone, Siltstone, and Shale
   u	Ultramafic Rocks
   um	Ultramafic Rocks
   v	Mafic and Felsic Volcanic Rocks
   vl	Metavolcanic and Metavolcanic Clastic Phyllite
   vo	Felsic/Mafic Volcanic Rocks
   water	water
   Ya	Amphibolite, Amphibole Gneiss, and Schist
   Yal	Alkali Feldspar Leucogranite
   Yan	Montpelier Metanorthosite
   Ybg	Porphyoblastic Biotite-Plagioclase Augen Gneiss
   Yblg	Biotite-Muscovite Leucogranite Gneiss
   Ybp	Porphyroblastic Granite Gneiss
   Ybr	Border Gneiss
   Yc	Charnockite
   Ycm	Charnockite Gneiss
   Ycz	Crozet Granite
   Yec	Elk Park Plutonic Group
   Yep	Elk Park Plutonic Group
   Yfh	Flint Hill Gneiss
   Yg	Leucocratic Metagranite
   Ygb	Layered Biotite Granulite and Gneiss
   Ygbt	Biotite Granite
   Ygg	Layered Leucocratic Granite Gneiss
   Ygh	Hornblende Gneiss
   Ygn	Leucocratic Granulite and Gneiss
   Ygr	Biotite Granite Gneiss
   Ygt	Garnetiferous Leucocratic Metagranite
   Yhd	Biotite-Hornblende Granodiorite
   Yhg	Megacrystic Charnockite
   Yl	Leucocharnockite
   Yma	Layered Quartzofeldspathic Augen Gneiss and Flaser Gneiss
   Ymc	Marshall Metagranite
   Ymd	Porphyroblastic Garnet-Biotite Gneiss
   Ymg	Two-Mica Granite
   Ymm	Marshall Metagranite
   Yms	Muscovite Schist and Gneiss
   Yn	Metanorite and Metadiorite
   Yor	Old Rag Granite
   Yp	Garnet-Graphite Paragneiss
   PzYgr	Granite Gneiss
   PzYpm	Quartzofeldspathic Gneiss
   Ypc	Porphyritic Leucocharnockite
   Ypg	Layered Pyroxene Granulite
   Ypp	Layered Porphyrobliastic Pyroxene Granulite
   Yq	Quartzite and Quartz-Sericite Tectonite
   Yra	Roseland Anorthosite
   Ysc	Stuart Creek Gneiss
   Ysf	State Farm Gneiss
   Ysh	Schaeffer Hollow Granite
   Yt	Metatrondhjemite
   Yum	Metaperidotite, Metapyroxenite, and Hornblende Metagabbro
   Za	Aaron Slate
   Zaa	Ashe Formation
   Zac	Aaron Slate
   Zam	Ashe Formation
   Zas	Ashe Formation
   Zau	Ashe Formation
   Zav	Felsic Volcanic and Volcaniclastic Rocks
   Zbg	Bassett Formation
   Zch	Charlottesville Formation
   Zfa	Fauquier Formation
   Zfc	Fauquier Formation
   Zfl	Fauquier Formation
   Zfs	Fauquier Formation
   Zfv	Felsic Volcanic Rocks
   Zgd	Biotite Granodiorite and Biotite Granite
   Zgdm	Mobley Mountain Granite
   Zgdr	Rockfish River Pluton
   Zgds	Striped Rock Granite
   Zgs	Mount Rogers Formation
   Zh	Hyco Formation
   Zhf	Phyllite and Metatuff
   Zkr	Konnarock Formation
   Zlc	Lynchburg Group
   Zlf	Lynchburg Group
   Zlg	Lynchburg Group
   Zlm	Lynchburg Group
   Zlq	Lynchburg Group
   Zlv	Interlayered Mafic and Felsic Volcanic Rocks
   Zm	Marble
   Zmf	Mount Rogers Formation
   Zmg	Ashe Formation
   Zml	Mount Rogers Formation
   Zmm	Monumental Mills Formation
   Zmp	Mount Rogers Formation
   Zmr	Mount Rogers Formation
   Zmv	Mafic Volcanic Rocks
   PzZbk	Buckingham Complex
   PzZbq	Buckingham Complex
   PzZdm	Diana Mills Complex
   PzZgq	Green Springs Pluton
   PzZgs	Green Springs Pluton
   Zph	Phyllite and Metasiltstone
   Zra	Robertson River Igneous Suite
   Zram	Robertson River Igneous Suite
   Zrbf	Robertson River Igneous Suite
   Zrbg	Robertson River Igneous Suite
   Zrc	Robertson River Igneous Suite
   Zrh	Robertson River Igneous Suite
   Zrl	Robertson River Igneous Suite
   Zrr	Robertson River Igneous Suite
   Zrw	Robertson River Igneous Suite
   Zsr	Swift Run Formation
   Zvi	Virgilina Greenstone

   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)

   Value	Definition
   adg;0	Altered Diorite and Gabbro
   af;0	Artificial Fill
   ag;0	Abbeyville Gabbro
   ak;0	Alaskite
   al;0	Alluvium
   amr;0	Amphibolite and Amphibole-Bearing Gneiss and Schist
   JTbasalt;0	Valley and Ridge Igneous Intrusions; Basalt
   bgd;0	Biotite Granodiorite
   bgp;0	Porphyroblastic Biotite Gneiss
   bgr;0	Burkeville Pluton
   bgs;0	Biotite Gneiss and Schist
   bmgl;0	Biotite-Muscovite Granite
   bo;0	Buffalo Granite
   CAbg;0	Interlayered Mafic and Felsic Metavolcanic Rocks
   CAc;0	Conasauga Shale
   CAca;0	Candler Formation
   CAcas;0	Candler Formation
   CAcfv;0	Chopawamsic Formation
   CAch;0	Chilhowee Group
   CAcmv;0	Chopawamsic Formation
   CAco;0	Conococheague Formation
   CAcv;0	Chopawamsic Formation
   CAd;0	Dale City Pluton
   CAe;0	Elbrook Formation
   CAeh;0	Erwin and Hampton Formations
   CAev;0	Everona Limestone
   CAf;0	Frederick Limestone
   CAfq;0	Interlayered Mafic and Felsic Metavolcanic Rocks
   CAfv;0	Interlayered Mafic and Felsic Metavolcanic Rocks
   CAfvs;0	Metavolcanic and Metasedimentary Rocks
   CAg;0	Amphibolite
   CAgi;0	Georgetown Intrusive Suite
   CAi;0	Indian Run Formation
   CAl;0	Lunga Reservoir Formation
   CAlw;0	Leatherwood Granite
   CAm;0	Melrose Granite
   CAmv;0	Interlayered Mafic and Felsic Metavolcanic Rocks
   CAmvs;0	Metavolcanic and Metasedimentary Rocks
   CAnhk;0	Nolichucky and Honaker Formations
   CAnmrr;0	Nolichucky and Maryville Formations, Rogersville Shale, and Rutledge Formation
   CAp;0	Purcell Branch Formation
   CAr;0	Rome Formation
   CAra;0	Rich Acres Formation
   CAs;0	Shady Dolomite
   CAsg;0	Interlayered Mafic and Felsic Metavolcanic Rocks
   CAsv;0	Sykesville Formation
   CAt;0	Tomstown Dolomite
   CAta;0	Ta River Metamorphic Suite
   CAu;0	Unicoi Formation
   CAwb;0	Waynesboro Formation
   CAwbt;0	Waynesboro Formation and Tomstown Dolomite
   CAy;0	Yorkshire Formation
   CAZa;0	Annandale Group
   CAZba;0	Alligator Back Formation
   CAZac;0	Alligator Back Formation
   CAZas;0	Alligator Back Formation
   CAZba;0	Bassett Formation
   CAZc;0	Catoctin Formation
   CAZcb;0	Catoctin Formation
   CAZcr;0	Catoctin Formation
   CAZcs;0	Catoctin Formation
   CAZfm;0	Fork Mountain Formation
   CAZg;0	Garrisonville Mafic Complex
   CAZh;0	Holly Corner Gneiss
   CAZhb;0	Catoctin Formation
   CAZl;0	Annandale Group
   CAZlb;0	Catoctin Formation
   CAZmd;0	Metagabbro
   CAZmg;0	Mather Gorge Formation
   CAZmi;0	Mafic Igneous Complex Undivided
   CAZmq;0	Micaceous Quartzite
   CAZms;0	Mather Gorge Formation
   CAZmy;0	Alligator Back Formation
   CAZpb;0	Piney Branch Complex
   CAZpm;0	Metagraywacke, Quartzose Schist, and Melange
   CAZum;0	Ultramafic Rocks
   cm;0	Polygenetic Melange
   Db;0	Brallier Formation
   Dch;0	Chemung Formation
   dgn;0	Diorite Gneiss
   Dhs;0	Hampshire Formation
   di;0	Diorite and Quartz Diorite
   Dma;0	Mahantango Formation
   Dmn;0	Millboro Shale and Needmore Formation
   Dmrn;0	Marcellus Shale and Needmore Formation
   ds;0	Dune Sand
   DSOz;0	Lower Devonian, Silurian and Upper Ordovician Formations Undivided
   DSu;0	Ridgeley Sandstone, Helderberg and Cayugan Groups
   DSz;0	Lower Devonian and Silurian Formations Undivided
   Dx;0	Millboro Shale, Huntersville Chert, and Rocky Gap Sandstone
   fbgr;0	Foliated Biotite Granite
   fcm;0	Fine Creek Mills Granite
   fg;0	Gneissic Granite and Granodiorite
   fgb;0	Biotite Granite Gneiss
   fr;0	Flat Rock Granite
   g;0	Granite
   ga;0	Hornblende Gabbro
   gn;0	Gneiss
   gns;0	Gneiss and Schist
   gr;0	Granitoid Rocks
   grb;0	Biotite Granite
   grbi;0	Biotite Granite
   grc;0	Carysbrook Pluton
   grp;0	Porphyritic Granite
   grpo;0	Porphyritic Granite
   grt;0	Metatonalite
   gs;0	Actinolite Schist Metabasalt
   Jb;0	Newark Supergroup; Jurassic Basalt
   Jc;0	Newark Supergroup; Jurassic Conglomerate
   Jd;0	Diabase
   Jsh;0	Newark Supergroup; Jurassic Siltstone and Shale
   Jss;0	Newark Supergroup; Jurassic Interbedded Sandstone and Siltstone
   JTRp;0	Valley and Ridge Igneous Intrusions; Peridotite
   Kp;0	Potomac Formation
   ks;0	Kyanite Schist
   lgn;0	Lineated Biotite Granite Gneiss
   ls;0	Candler Formation
   m;0	Marsh and Intertidal Mud Deposits
   Mbf;0	Bluefield Formation
   Mccf;0	Cove Creek Limestone and Fido Sandstone
   MDcw;0	Chattanooda Shale and Wildcat Valley Sandstone
   mf;0	Mafic Plutonic Rocks
   Mg;0	Greenbrier Limestone
   mgb;0	Metagabbro
   mgr;0	Metagraywacke
   Mm;0	Maccrady Shale
   Mmpr;0	Maccrady Shale and Price Formation
   Mp;0	Pennington Group
   Mpbg;0	Petersburg Granite
   mpg;0	Migmatitic Paragneiss
   Mpo;0	Pocono Formation
   Mpr;0	Price Formation
   msg;0	Miocene Sand and Gravel
   mss;0	Metasandstone and Metasiltstone
   my;0	Mylonite, Mylonite Gneiss, and Cataclastic Rocks
   Mz;0	Mississippian Formations Undivided
   nv;0	North View Pluton
   Oa;0	Arvonia Formation
   Oas;0	Arvonia Formation
   Ob;0	Beekmantown Group
   Obf;0	Buffards Formation
   Obi;0	Bear Island Granodiorite
   Obq;0	Arvonia Formation
   OCAcc;0	Chepultepec and Copper Ridge Formations
   OCAco;0	Conococheague Formation
   OCAd;0	Dalecarlia Instrusive Suite
   OCAf;0	Falls Church Intrusive Suite
   OCAgg;0	Goldvein Pluton
   OCAk;0	Knox Group
   OCAo;0	Occoquan Granite
   OCAp;0	Phyllite
   OCApg;0	Plagiogranite Tonalite
   OCApo;0	Popes Head Formation
   OCAps;0	Popes Head Formation
   OCAtj;0	Trondhjemite
   OCAu;0	Metasedimentary Rocks Undivided
   OCAz;0	Lower Ordovician and Upper Cambrian Formations Undivided
   Ocg;0	Columbia pluton
   Oeln;0	Edinburg Formation, Lincolnshire and New Market Limestones
   Okpl;0	Knobs Formation, Paperville Shale, Lenoir and Mosheim Limestone
   Okq;0	Arvonia Formation
   Ol;0	Lake Jackson Pluton
   Ola;0	Lahore Complex
   Olm;0	Lahore Complex
   Olp;0	Lahore Complex
   Ols;0	Moccasin or Bays Formation through Blackford Formation
   Om;0	Martinsburg and Oranda Formations
   Omk;0	Mascot and Kingsport Dolomites
   Oml;0	Hardy Creek Limestone through Dot Limestone
   Oq;0	Quantico Formation
   Oqq;0	Quantico Formation
   Ost;0	Shelton Formation
   Ot;0	Metatonalite
   Ou;0	Sequatchie Formation, Reedsville Shale, Trenton Limestone, Eggleston Formation
   Oun;0	Juniata, Oswego, Martinsburg (Reedsville and Dolly Ridge), and Eggleston Formations
   Ous;0	Juniata, Reedsville, Trenton, and Eggleston Formations
   Oz;0	Upper and Middle Ordovician Formations Undivided
   OZl;0	Mine Run Complex
   OZll;0	Mine Run Complex
   OZlll;0	Mine Run Complex
   PAh;0	Harlan Sandstone
   PAk;0	Kanawha Formation
   PAl;0	Lee Formation
   PAMbi;0	Buggs Island Pluton
   PAMf;0	Falmouth Intrusive Suite
   PAMl;0	Lee Formation
   PAn;0	Norton Formation
   PAnr;0	New River Formation
   PAp;0	Pocahontas Formation
   PAw;0	Wise Formation
   PAwg;0	Wise Formation and Gladeville Sandstone
   PAz;0	Norton, New River, Lee and Pocahontas Formations Undivided
   pbg;0	Porphyroblastic Biotite Granite
   peg;0	Granite Pegmatite
   pg;0	Plagiogranite
   pgo;0	Pegmatite
   Ppg;0	Pegmatite
   psg;0	Pliocene Sand and Gravel
   py;0	Phyllonite
   Qc;0	Chuckatuck Formation
   Qcc;0	Charles City Formation
   Qj;0	Joynes Neck Sand
   Qk;0	Kent Island Formation
   Qnb;0	Nassawadox Formation
   Qno;0	Nassawadox Formation
   Qoa;0	Omar Formation
   Qsh;0	Shirley Formation
   Qt;0	Tabb Formation
   Qtl;0	Tabb Formation; Lynnhaven Member
   Qtlp;0	Tabb Formation: Lynnhaven and Poquoson Members
   Qtp;0	Tabb Formtaion; Poquoson Member
   Qts;0	Tabb Formation; Sedgefield Member
   QTu;0	Quaternary and Tertiary Deposits
   QTw;0	Windsor Formation
   Qwa;0	Wachapreague Formation
   rbg;0	Biotite Gneiss
   ro;0	Red Oak Pluton
   sb;0	Beach Sand and Dune Sand Deposits
   sch;0	Schist
   Sf;0	Falls Run Granite Gneiss
   Shrc;0	Hancock, Rose Hill, and Clinch Formations
   Skrt;0	Keefer, Rose Hill, and Tuscarora Formations
   Sm;0	Massanutten Sandstone
   SOe;0	Ellisville Biotite Granodiorite
   SOz;0	Silurian and Upper Ordovician Formations Undivided
   sp;0	Swamp Deposits
   Sz;0	Silurian Formations Undivided
   Tb1;0	Bacons Castle Formation
   Tb2;0	Bacons Castle Formation
   Tc;0	Chesapeake Group
   td;0	Terrace Deposits
   Tl;0	Lower Tertiary Deposits
   Tm;0	Moorings Unit of Oaks and Coch (1973)
   TRbr;0	Newark Supergroup; Breccia, mixed clasts
   TRbr1;0	Newark Supergroup; Breccia, mudstone clasts
   TRc;0	Newark Supergroup; Conglomerate, mixed clasts
   TRc1;0	Newark Supergroup; Conglomerate, limestone clasts
   TRc2;0	Newark Supergroup; Conglomerate, greenstone clasts
   TRc3;0	Newark Supergroup; Conglomerate, arkosic maatrix
   TRcs;0	Newark Supergroup; Triassic Sandstone, Siltstone, Shale, and Coal
   TRs;0	Newark Supergroup; Sandstone, undifferentiated
   TRs1;0	Newark Supergroup; Arkosic Sandstone
   TRsh;0	Newark Supergroup; Triassic shale and siltstone
   TRss;0	Newark Supergroup; Triassic Sandstone, Siltstone, and Shale
   u;0	Ultramafic Rocks
   um;0	Ultramafic Rocks
   v;0	Mafic and Felsic Volcanic Rocks
   vl;0	Metavolcanic and Metavolcanic Clastic Phyllite
   vo;0	Felsic/Mafic Volcanic Rocks
   water;0	water
   Ya;0	Amphibolite, Amphibole Gneiss, and Schist
   Yal;0	Alkali Feldspar Leucogranite
   Yan;0	Montpelier Metanorthosite
   Ybg;0	Porphyoblastic Biotite-Plagioclase Augen Gneiss
   Yblg;0	Biotite-Muscovite Leucogranite Gneiss
   Ybp;0	Porphyroblastic Granite Gneiss
   Ybr;0	Border Gneiss
   Yc;0	Charnockite
   Ycm;0	Charnockite Gneiss
   Ycz;0	Crozet Granite
   Yec;0	Elk Park Plutonic Group
   Yep;0	Elk Park Plutonic Group
   Yfh;0	Flint Hill Gneiss
   Yg;0	Leucocratic Metagranite
   Ygb;0	Layered Biotite Granulite and Gneiss
   Ygbt;0	Biotite Granite
   Ygg;0	Layered Leucocratic Granite Gneiss
   Ygh;0	Hornblende Gneiss
   Ygn;0	Leucocratic Granulite and Gneiss
   Ygr;0	Biotite Granite Gneiss
   Ygt;0	Garnetiferous Leucocratic Metagranite
   Yhd;0	Biotite-Hornblende Granodiorite
   Yhg;0	Megacrystic Charnockite
   Yl;0	Leucocharnockite
   Yma;0	Layered Quartzofeldspathic Augen Gneiss and Flaser Gneiss
   Ymc;0	Marshall Metagranite
   Ymd;0	Porphyroblastic Garnet-Biotite Gneiss
   Ymg;0	Two-Mica Granite
   Ymm;0	Marshall Metagranite
   Yms;0	Muscovite Schist and Gneiss
   Yn;0	Metanorite and Metadiorite
   Yor;0	Old Rag Granite
   Yp;0	Garnet-Graphite Paragneiss
   YPAgr;0	Granite Gneiss
   YPApm;0	Quartzofeldspathic Gneiss
   Ypc;0	Porphyritic Leucocharnockite
   Ypg;0	Layered Pyroxene Granulite
   Ypp;0	Layered Porphyrobliastic Pyroxene Granulite
   Yq;0	Quartzite and Quartz-Sericite Tectonite
   Yra;0	Roseland Anorthosite
   Ysc;0	Stuart Creek Gneiss
   Ysf;0	State Farm Gneiss
   Ysh;0	Schaeffer Hollow Granite
   Yt;0	Metatrondhjemite
   Yum;0	Metaperidotite, Metapyroxenite, and Hornblende Metagabbro
   Za;0	Aaron Slate
   Zaa;0	Ashe Formation
   Zac;0	Aaron Slate
   Zam;0	Ashe Formation
   Zas;0	Ashe Formation
   Zau;0	Ashe Formation
   Zav;0	Felsic Volcanic and Volcaniclastic Rocks
   Zbg;0	Bassett Formation
   Zch;0	Charlottesville Formation
   Zfa;0	Fauquier Formation
   Zfc;0	Fauquier Formation
   Zfl;0	Fauquier Formation
   Zfs;0	Fauquier Formation
   Zfv;0	Felsic Volcanic Rocks
   Zgd;0	Biotite Granodiorite and Biotite Granite
   Zgdm;0	Mobley Mountain Granite
   Zgdr;0	Rockfish River Pluton
   Zgds;0	Striped Rock Granite
   Zgs;0	Mount Rogers Formation
   Zh;0	Hyco Formation
   Zhf;0	Phyllite and Metatuff
   Zkr;0	Konnarock Formation
   Zlc;0	Lynchburg Group
   Zlf;0	Lynchburg Group
   Zlg;0	Lynchburg Group
   Zlm;0	Lynchburg Group
   Zlq;0	Lynchburg Group
   Zlv;0	Interlayered Mafic and Felsic Volcanic Rocks
   Zm;0	Marble
   Zmf;0	Mount Rogers Formation
   Zmg;0	Ashe Formation
   Zml;0	Mount Rogers Formation
   Zmm;0	Monumental Mills Formation
   Zmp;0	Mount Rogers Formation
   Zmr;0	Mount Rogers Formation
   Zmv;0	Mafic Volcanic Rocks
   ZPAbk;0	Buckingham Complex
   ZPAbq;0	Buckingham Complex
   ZPAdm	Diana Mills Complex
   ZPAgq;0	Green Springs Pluton
   ZPAgs;0	Green Springs Pluton
   Zph;0	Phyllite and Metasiltstone
   Zra;0	Robertson River Igneous Suite
   Zram;0	Robertson River Igneous Suite
   Zrbf;0	Robertson River Igneous Suite
   Zrbg;0	Robertson River Igneous Suite
   Zrc;0	Robertson River Igneous Suite
   Zrh;0	Robertson River Igneous Suite
   Zrl;0	Robertson River Igneous Suite
   Zrr;0	Robertson River Igneous Suite
   Zrw;0	Robertson River Igneous Suite
   Zsr;0	Swift Run Formation
   Zvi;0	Virgilina Greenstone

   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)

   Value	Definition
   VAadg;0	Altered Diorite and Gabbro
   VAaf;0	Artificial Fill
   VAag;0	Abbeyville Gabbro
   VAak;0	Alaskite
   VAal;0	Alluvium
   VAamr;0	Amphibolite and Amphibole-Bearing Gneiss and Schist
   VAJTbasalt;0	Valley and Ridge Igneous Intrusions; Basalt
   VAbgd;0	Biotite Granodiorite
   VAbgp;0	Porphyroblastic Biotite Gneiss
   VAbgr;0	Burkeville Pluton
   VAbgs;0	Biotite Gneiss and Schist
   VAbmgl;0	Biotite-Muscovite Granite
   VAbo;0	Buffalo Granite
   VACAbg;0	Interlayered Mafic and Felsic Metavolcanic Rocks
   VACAc;0	Conasauga Shale
   VACAca;0	Candler Formation
   VACAcas;0	Candler Formation
   VACAcfv;0	Chopawamsic Formation
   VACAch;0	Chilhowee Group
   VACAcmv;0	Chopawamsic Formation
   VACAco;0	Conococheague Formation
   VACAcv;0	Chopawamsic Formation
   VACAd;0	Dale City Pluton
   VACAe;0	Elbrook Formation
   VACAeh;0	Erwin and Hampton Formations
   VACAev;0	Everona Limestone
   VACAf;0	Frederick Limestone
   VACAfq;0	Interlayered Mafic and Felsic Metavolcanic Rocks
   VACAfv;0	Interlayered Mafic and Felsic Metavolcanic Rocks
   VACAfvs;0	Metavolcanic and Metasedimentary Rocks
   VACAg;0	Amphibolite
   VACAgi;0	Georgetown Intrusive Suite
   VACAi;0	Indian Run Formation
   VACAl;0	Lunga Reservoir Formation
   VACAlw;0	Leatherwood Granite
   VACAm;0	Melrose Granite
   VACAmv;0	Interlayered Mafic and Felsic Metavolcanic Rocks
   VACAmvs;0	Metavolcanic and Metasedimentary Rocks
   VACAnhk;0	Nolichucky and Honaker Formations
   VACAnmrr;0	Nolichucky and Maryville Formations, Rogersville Shale, and Rutledge Formation
   VACAp;0	Purcell Branch Formation
   VACAr;0	Rome Formation
   VACAra;0	Rich Acres Formation
   VACAs;0	Shady Dolomite
   VACAsg;0	Interlayered Mafic and Felsic Metavolcanic Rocks
   VACAsv;0	Sykesville Formation
   VACAt;0	Tomstown Dolomite
   VACAta;0	Ta River Metamorphic Suite
   VACAu;0	Unicoi Formation
   VACAwb;0	Waynesboro Formation
   VACAwbt;0	Waynesboro Formation and Tomstown Dolomite
   VACAy;0	Yorkshire Formation
   VACAZa;0	Annandale Group
   VACAZba;0	Alligator Back Formation
   VACAZac;0	Alligator Back Formation
   VACAZas;0	Alligator Back Formation
   VACAZba;0	Bassett Formation
   VACAZc;0	Catoctin Formation
   VACAZcb;0	Catoctin Formation
   VACAZcr;0	Catoctin Formation
   VACAZcs;0	Catoctin Formation
   VACAZfm;0	Fork Mountain Formation
   VACAZg;0	Garrisonville Mafic Complex
   VACAZh;0	Holly Corner Gneiss
   VACAZhb;0	Catoctin Formation
   VACAZl;0	Annandale Group
   VACAZlb;0	Catoctin Formation
   VACAZmd;0	Metagabbro
   VACAZmg;0	Mather Gorge Formation
   VACAZmi;0	Mafic Igneous Complex Undivided
   VACAZmq;0	Micaceous Quartzite
   VACAZms;0	Mather Gorge Formation
   VACAZmy;0	Alligator Back Formation
   VACAZpb;0	Piney Branch Complex
   VACAZpm;0	Metagraywacke, Quartzose Schist, and Melange
   VACAZum;0	Ultramafic Rocks
   VAcm;0	Polygenetic Melange
   VADb;0	Brallier Formation
   VADch;0	Chemung Formation
   VAdgn;0	Diorite Gneiss
   VADhs;0	Hampshire Formation
   VAdi;0	Diorite and Quartz Diorite
   VADma;0	Mahantango Formation
   VADmn;0	Millboro Shale and Needmore Formation
   VADmrn;0	Marcellus Shale and Needmore Formation
   VAds;0	Dune Sand
   VADSOz;0	Lower Devonian, Silurian and Upper Ordovician Formations Undivided
   VADSu;0	Ridgeley Sandstone, Helderberg and Cayugan Groups
   VADSz;0	Lower Devonian and Silurian Formations Undivided
   VADx;0	Millboro Shale, Huntersville Chert, and Rocky Gap Sandstone
   VAfbgr;0	Foliated Biotite Granite
   VAfcm;0	Fine Creek Mills Granite
   VAfg;0	Gneissic Granite and Granodiorite
   VAfgb;0	Biotite Granite Gneiss
   VAfr;0	Flat Rock Granite
   VAg;0	Granite
   VAga;0	Hornblende Gabbro
   VAgn;0	Gneiss
   VAgns;0	Gneiss and Schist
   VAgr;0	Granitoid Rocks
   VAgrb;0	Biotite Granite
   VAgrbi;0	Biotite Granite
   VAgrc;0	Carysbrook Pluton
   VAgrp;0	Porphyritic Granite
   VAgrpo;0	Porphyritic Granite
   VAgrt;0	Metatonalite
   VAgs;0	Actinolite Schist Metabasalt
   VAJb;0	Newark Supergroup; Jurassic Basalt
   VAJc;0	Newark Supergroup; Jurassic Conglomerate
   VAJd;0	Diabase
   VAJsh;0	Newark Supergroup; Jurassic Siltstone and Shale
   VAJss;0	Newark Supergroup; Jurassic Interbedded Sandstone and Siltstone
   VAJTRp;0	Valley and Ridge Igneous Intrusions; Peridotite
   VAKp;0	Potomac Formation
   VAks;0	Kyanite Schist
   VAlgn;0	Lineated Biotite Granite Gneiss
   VAls;0	Candler Formation
   VAm;0	Marsh and Intertidal Mud Deposits
   VAMbf;0	Bluefield Formation
   VAMccf;0	Cove Creek Limestone and Fido Sandstone
   VAMDcw;0	Chattanooda Shale and Wildcat Valley Sandstone
   VAmf;0	Mafic Plutonic Rocks
   VAMg;0	Greenbrier Limestone
   VAmgb;0	Metagabbro
   VAmgr;0	Metagraywacke
   VAMm;0	Maccrady Shale
   VAMmpr;0	Maccrady Shale and Price Formation
   VAMp;0	Pennington Group
   VAMpbg;0	Petersburg Granite
   VAmpg;0	Migmatitic Paragneiss
   VAMpo;0	Pocono Formation
   VAMpr;0	Price Formation
   VAmsg;0	Miocene Sand and Gravel
   VAmss;0	Metasandstone and Metasiltstone
   VAmy;0	Mylonite, Mylonite Gneiss, and Cataclastic Rocks
   VAMz;0	Mississippian Formations Undivided
   VAnv;0	North View Pluton
   VAOa;0	Arvonia Formation
   VAOas;0	Arvonia Formation
   VAOb;0	Beekmantown Group
   VAObf;0	Buffards Formation
   VAObi;0	Bear Island Granodiorite
   VAObq;0	Arvonia Formation
   VAOCAcc;0	Chepultepec and Copper Ridge Formations
   VAOCAco;0	Conococheague Formation
   VAOCAd;0	Dalecarlia Instrusive Suite
   VAOCAf;0	Falls Church Intrusive Suite
   VAOCAgg;0	Goldvein Pluton
   VAOCAk;0	Knox Group
   VAOCAo;0	Occoquan Granite
   VAOCAp;0	Phyllite
   VAOCApg;0	Plagiogranite Tonalite
   VAOCApo;0	Popes Head Formation
   VAOCAps;0	Popes Head Formation
   VAOCAtj;0	Trondhjemite
   VAOCAu;0	Metasedimentary Rocks Undivided
   VAOCAz;0	Lower Ordovician and Upper Cambrian Formations Undivided
   VAOcg;0	Columbia pluton
   VAOeln;0	Edinburg Formation, Lincolnshire and New Market Limestones
   VAOkpl;0	Knobs Formation, Paperville Shale, Lenoir and Mosheim Limestone
   VAOkq;0	Arvonia Formation
   VAOl;0	Lake Jackson Pluton
   VAOla;0	Lahore Complex
   VAOlm;0	Lahore Complex
   VAOlp;0	Lahore Complex
   VAOls;0	Moccasin or Bays Formation through Blackford Formation
   VAOm;0	Martinsburg and Oranda Formations
   VAOmk;0	Mascot and Kingsport Dolomites
   VAOml;0	Hardy Creek Limestone through Dot Limestone
   VAOq;0	Quantico Formation
   VAOqq;0	Quantico Formation
   VAOst;0	Shelton Formation
   VAOt;0	Metatonalite
   VAOu;0	Sequatchie Formation, Reedsville Shale, Trenton Limestone, Eggleston Formation
   VAOun;0	Juniata, Oswego, Martinsburg (Reedsville and Dolly Ridge), and Eggleston Formations
   VAOus;0	Juniata, Reedsville, Trenton, and Eggleston Formations
   VAOz;0	Upper and Middle Ordovician Formations Undivided
   VAOZl;0	Mine Run Complex
   VAOZll;0	Mine Run Complex
   VAOZlll;0	Mine Run Complex
   VAPAh;0	Harlan Sandstone
   VAPAk;0	Kanawha Formation
   VAPAl;0	Lee Formation
   VAPAMbi;0	Buggs Island Pluton
   VAPAMf;0	Falmouth Intrusive Suite
   VAPAMl;0	Lee Formation
   VAPAn;0	Norton Formation
   VAPAnr;0	New River Formation
   VAPAp;0	Pocahontas Formation
   VAPAw;0	Wise Formation
   VAPAwg;0	Wise Formation and Gladeville Sandstone
   VAPAz;0	Norton, New River, Lee and Pocahontas Formations Undivided
   VApbg;0	Porphyroblastic Biotite Granite
   VApeg;0	Granite Pegmatite
   VApg;0	Plagiogranite
   VApgo;0	Pegmatite
   VAPpg;0	Pegmatite
   VApsg;0	Pliocene Sand and Gravel
   VApy;0	Phyllonite
   VAQc;0	Chuckatuck Formation
   VAQcc;0	Charles City Formation
   VAQj;0	Joynes Neck Sand
   VAQk;0	Kent Island Formation
   VAQnb;0	Nassawadox Formation
   VAQno;0	Nassawadox Formation
   VAQoa;0	Omar Formation
   VAQsh;0	Shirley Formation
   VAQt;0	Tabb Formation
   VAQtl;0	Tabb Formation; Lynnhaven Member
   VAQtlp;0	Tabb Formation: Lynnhaven and Poquoson Members
   VAQtp;0	Tabb Formtaion; Poquoson Member
   VAQts;0	Tabb Formation; Sedgefield Member
   VAQTu;0	Quaternary and Tertiary Deposits
   VAQTw;0	Windsor Formation
   VAQwa;0	Wachapreague Formation
   VArbg;0	Biotite Gneiss
   VAro;0	Red Oak Pluton
   VAsb;0	Beach Sand and Dune Sand Deposits
   VAsch;0	Schist
   VASf;0	Falls Run Granite Gneiss
   VAShrc;0	Hancock, Rose Hill, and Clinch Formations
   VASkrt;0	Keefer, Rose Hill, and Tuscarora Formations
   VASm;0	Massanutten Sandstone
   VASOe;0	Ellisville Biotite Granodiorite
   VASOz;0	Silurian and Upper Ordovician Formations Undivided
   VAsp;0	Swamp Deposits
   VASz;0	Silurian Formations Undivided
   VATb1;0	Bacons Castle Formation
   VATb2;0	Bacons Castle Formation
   VATc;0	Chesapeake Group
   VAtd;0	Terrace Deposits
   VATl;0	Lower Tertiary Deposits
   VATm;0	Moorings Unit of Oaks and Coch (1973)
   VATRbr;0	Newark Supergroup; Breccia, mixed clasts
   VATRbr1;0	Newark Supergroup; Breccia, mudstone clasts
   VATRc;0	Newark Supergroup; Conglomerate, mixed clasts
   VATRc1;0	Newark Supergroup; Conglomerate, limestone clasts
   VATRc2;0	Newark Supergroup; Conglomerate, greenstone clasts
   VATRc3;0	Newark Supergroup; Conglomerate, arkosic maatrix
   VATRcs;0	Newark Supergroup; Triassic Sandstone, Siltstone, Shale, and Coal
   VATRs;0	Newark Supergroup; Sandstone, undifferentiated
   VATRs1;0	Newark Supergroup; Arkosic Sandstone
   VATRsh;0	Newark Supergroup; Triassic shale and siltstone
   VATRss;0	Newark Supergroup; Triassic Sandstone, Siltstone, and Shale
   VAu;0	Ultramafic Rocks
   VAum;0	Ultramafic Rocks
   VAv;0	Mafic and Felsic Volcanic Rocks
   VAvl;0	Metavolcanic and Metavolcanic Clastic Phyllite
   VAvo;0	Felsic/Mafic Volcanic Rocks
   VAwater;0	water
   VAYa;0	Amphibolite, Amphibole Gneiss, and Schist
   VAYal;0	Alkali Feldspar Leucogranite
   VAYan;0	Montpelier Metanorthosite
   VAYbg;0	Porphyoblastic Biotite-Plagioclase Augen Gneiss
   VAYblg;0	Biotite-Muscovite Leucogranite Gneiss
   VAYbp;0	Porphyroblastic Granite Gneiss
   VAYbr;0	Border Gneiss
   VAYc;0	Charnockite
   VAYcm;0	Charnockite Gneiss
   VAYcz;0	Crozet Granite
   VAYec;0	Elk Park Plutonic Group
   VAYep;0	Elk Park Plutonic Group
   VAYfh;0	Flint Hill Gneiss
   VAYg;0	Leucocratic Metagranite
   VAYgb;0	Layered Biotite Granulite and Gneiss
   VAYgbt;0	Biotite Granite
   VAYgg;0	Layered Leucocratic Granite Gneiss
   VAYgh;0	Hornblende Gneiss
   VAYgn;0	Leucocratic Granulite and Gneiss
   VAYgr;0	Biotite Granite Gneiss
   VAYgt;0	Garnetiferous Leucocratic Metagranite
   VAYhd;0	Biotite-Hornblende Granodiorite
   VAYhg;0	Megacrystic Charnockite
   VAYl;0	Leucocharnockite
   VAYma;0	Layered Quartzofeldspathic Augen Gneiss and Flaser Gneiss
   VAYmc;0	Marshall Metagranite
   VAYmd;0	Porphyroblastic Garnet-Biotite Gneiss
   VAYmg;0	Two-Mica Granite
   VAYmm;0	Marshall Metagranite
   VAYms;0	Muscovite Schist and Gneiss
   VAYn;0	Metanorite and Metadiorite
   VAYor;0	Old Rag Granite
   VAYp;0	Garnet-Graphite Paragneiss
   VAYPAgr;0	Granite Gneiss
   VAYPApm;0	Quartzofeldspathic Gneiss
   VAYpc;0	Porphyritic Leucocharnockite
   VAYpg;0	Layered Pyroxene Granulite
   VAYpp;0	Layered Porphyrobliastic Pyroxene Granulite
   VAYq;0	Quartzite and Quartz-Sericite Tectonite
   VAYra;0	Roseland Anorthosite
   VAYsc;0	Stuart Creek Gneiss
   VAYsf;0	State Farm Gneiss
   VAYsh;0	Schaeffer Hollow Granite
   VAYt;0	Metatrondhjemite
   VAYum;0	Metaperidotite, Metapyroxenite, and Hornblende Metagabbro
   VAZa;0	Aaron Slate
   VAZaa;0	Ashe Formation
   VAZac;0	Aaron Slate
   VAZam;0	Ashe Formation
   VAZas;0	Ashe Formation
   VAZau;0	Ashe Formation
   VAZav;0	Felsic Volcanic and Volcaniclastic Rocks
   VAZbg;0	Bassett Formation
   VAZch;0	Charlottesville Formation
   VAZfa;0	Fauquier Formation
   VAZfc;0	Fauquier Formation
   VAZfl;0	Fauquier Formation
   VAZfs;0	Fauquier Formation
   VAZfv;0	Felsic Volcanic Rocks
   VAZgd;0	Biotite Granodiorite and Biotite Granite
   VAZgdm;0	Mobley Mountain Granite
   VAZgdr;0	Rockfish River Pluton
   VAZgds;0	Striped Rock Granite
   VAZgs;0	Mount Rogers Formation
   VAZh;0	Hyco Formation
   VAZhf;0	Phyllite and Metatuff
   VAZkr;0	Konnarock Formation
   VAZlc;0	Lynchburg Group
   VAZlf;0	Lynchburg Group
   VAZlg;0	Lynchburg Group
   VAZlm;0	Lynchburg Group
   VAZlq;0	Lynchburg Group
   VAZlv;0	Interlayered Mafic and Felsic Volcanic Rocks
   VAZm;0	Marble
   VAZmf;0	Mount Rogers Formation
   VAZmg;0	Ashe Formation
   VAZml;0	Mount Rogers Formation
   VAZmm;0	Monumental Mills Formation
   VAZmp;0	Mount Rogers Formation
   VAZmr;0	Mount Rogers Formation
   VAZmv;0	Mafic Volcanic Rocks
   VAZPAbk;0	Buckingham Complex
   VAZPAbq;0	Buckingham Complex
   VAZPAdm	Diana Mills Complex
   VAZPAgq;0	Green Springs Pluton
   VAZPAgs;0	Green Springs Pluton
   VAZph;0	Phyllite and Metasiltstone
   VAZra;0	Robertson River Igneous Suite
   VAZram;0	Robertson River Igneous Suite
   VAZrbf;0	Robertson River Igneous Suite
   VAZrbg;0	Robertson River Igneous Suite
   VAZrc;0	Robertson River Igneous Suite
   VAZrh;0	Robertson River Igneous Suite
   VAZrl;0	Robertson River Igneous Suite
   VAZrr;0	Robertson River Igneous Suite
   VAZrw;0	Robertson River Igneous Suite
   VAZsr;0	Swift Run Formation
   VAZvi;0	Virgilina Greenstone

   source

   An alphanumeric code (e.g. US001) that designates the source material used.

   type: character width: 6 output width: 8 (Source: Doug Stoeser)

   Value	Definition
   VA003	Digital Representation of the 1993 Geologic Map of Virginia”, 2003, CD ROM (ISO-9660) contains image file, expanded explanation in pdf, and ESRI shapefiles, viewing software not included. This is a digital version of "Geologic Map of Virginia" published in 1993. Available from: https://www.dmme.virginia.gov/commerce/
   US001	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, Chapter A)

   unit_age

   The geologic age from the source map used.

   type: character width: 60 output width: 60 (Source: Doug Stoeser)

   Value	Definition
   Cambrian
   Cambrian-Ordovician
   Cretaceous
   Devonian
   Devonian-Mississippian
   Jurassic
   Jurassic-Tertiary
   Mississippian
   Mississippian Pennsylvanian
   Ordovician
   Ordovician-Devonian
   Ordovician-Silurian
   Pennsylvanian
   Pennsylvanian - Miss
   Permian
   Proterozoic
   Proterozoic Cambrian
   Proterozoic Y
   Proterozoic Y-Pennsylvanian
   Proterozoic Z
   Proterozoic Z-Cambrian
   Proterozoic Z-Ordovician
   Proterozoic Z-Pennsylvanian
   Quaternary
   Silurian
   Silurian-Devonian
   Tertiary
   Tertiary-Quaternary
   Triassic

   rocktype1

   The predominant lithology found in the formation.

   type: character width: 40 output width: 40 (Source: Johnson Lith Class 6.1a)

   Value	Definition
   alkali syenite
   alkali-granite (alaskite)
   alluvium
   amphibolite
   anorthosite
   arenite
   augen gneiss
   basalt
   beach sand
   biotite gneiss
   black shale
   breccia
   clay or mud
   conglomerate
   diabase
   diorite
   dolostone (dolomite)
   dune sand
   felsic gneiss
   felsic metavolcanic rock
   felsic volcanic rock
   gabbro
   gneiss
   granite
   granitic gneiss
   granitoid
   granodiorite
   granulite
   gravel
   greenstone
   limestone
   mafic gneiss
   mafic metavolcanic rock
   mafic rock
   marble
   melange
   meta-argillite
   meta-basalt
   meta-conglomerate
   metamorphic rock
   metasedimentary rock
   metavolcanic rock
   mica schist
   monzonite
   mylonite
   norite
   orthogneiss
   paragneiss
   peat
   pegmatite
   pelitic schist
   peridotite
   phyllite
   phyllonite
   quartz diorite
   quartz monzonite
   quartzite
   rhyolite
   sand
   sandstone
   schist
   sedimentary breccia
   serpentinite
   shale
   slate
   terrace
   tonalite
   trondhjemite
   ultramafitite (komatiite)
   unconsolidated deposit
   water

   rocktype2

   The second most predominant lithology in the formation.

   type: character width: 40 output width: 40 (Source: Johnson Lith Class 6.1)

   Value	Definition
   amphibolite
   andesite
   arkose
   biotite gneiss
   black shale
   chert
   clay or mud
   conglomerate
   dolostone (dolomite)
   dune sand
   felsic metavolcanic rock
   flaser gneiss
   gabbro
   gneiss
   granite
   granitic gneiss
   granodiorite
   gravel
   graywacke
   greenstone
   hornblendite
   intermediate metavolcanic rock
   limestone
   meta-argillite
   metasedimentary rock
   mica schist
   mixed clastic/volcanic
   monzonite
   mudstone
   norite
   phyllite
   quartz diorite
   quartz monzodiorite
   quartz monzonite
   quartzite
   sand
   sandstone
   schist
   shale
   silt
   siltstone
   slate
   syenite
   tectonite

   VA_geol.aat

   Arc attribute table for Virginia geologic coverage. (Source: ESRI)

   arc-code

   Unique identifier for the line feature

   type: integer width: 3 output width: 3 (Source: AAT data dictionary)

   Value	Definition
   1	contact, location certain
   7	shoreline or riverbank
   94	shear zone, certain.
   124	state boundary

   arc-para1

   Used for "decorated" lines where additional information is needed.

   type: integer width: 3 output width: 3 (Source: AAT data dictionary)

   Value	Definition
   0	no additional information

   arc-para2

   "Scratch" field used mostly in Alaska.

   type: integer width: 3 output width: 3 (Source: AAT data dictionary)

   Value	Definition
   0	no additional information

   source

   An alphanumeric code (e.g. US001) that designates the source material used.

   type: character width: 6 output width: 8 (Source: Doug Stoeser)

   Value	Definition
   VA003	Digital Representation of the 1993 Geologic Map of Virginia”, 2003, CD ROM (ISO-9660) contains image file, expanded explanation in pdf, and ESRI shapefiles, viewing software not included. This is a digital version of "Geologic Map of Virginia" published in 1993. Available from: https://www.dmme.virginia.gov/commerce/
   US001	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, Chapter A)

   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)
   • Connie L. Dicken
   • Suzanne W. Nicholson
   • John D. Horton
   • Scott A. Kinney
   • Gregory Gunther
   • Michael P. Foose
   • Julia A.L. Mueller

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 20192
   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 CONUS documentation of this report. 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 derived from the USGS Digial Line Graph 1:100,000 quadrangle boundaries (Johnson and Leveritch, 1998) 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?

   va geology (source 1 of 3)

   Virginia Department of Mines, Mineral and Energy, unpublished, Geologic Map of Virginia: Virginia Department of Mines, Mineral and Energy, Charlottesville, VA.

   Online Links:

   • <http://www.dmme.virginia.gov/DMR/DOCS/Digit/dgm2.html#digeo>

   Type_of_Source_Media: vector

   Source_Scale_Denominator: 500,000

   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.

   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 3 of 3)

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

   Other_Citation_Details:

   Document has been modified and is included in Appedices 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 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 and Ric Wilson are co-coordinators for the overall State Geologic Map Compilation (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 received the digital geology file from Karen Hostettler of the Virginia Department of Mines, Mineral and Energy on July 12, 2005 by ftp.

   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

   All attributes were deleted except geology.

   (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)

   The values from geology 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 (renamed sgmc_label in PAT)

   unit_link is an auto generated field based on map-symbol2 and the state abbreviation (e.g. IN001) 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. (renamed source in PAT).

   unit_age was populated with general age assignment

   rocktype1 records dominant lithology (must be >50% of unit), 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 CONUS documentation in this report).

   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 CONUS documentation)

   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: 2005 (process 8 of 10)

   Once the .aat and the .pat were populated with the correct attributes, the coverage was exported as an .e00 file (VAgeol_lcc.e00).

   Then it was unprojected into geographic coordinates and exported again (VAgeol_dd.e00).

   Date: 2005 (process 9 of 10)

   Separate faults were received from DMME and the fault coverage. The arcs were attributed with arc-code = 30. The file was projected into the Lambert projection and saved as VAfaults_lcc. It was then exported as VAfaults_lcc.e00.

   Date: 2005 (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://www.nadm-geo.org/dmdt/index.html>

2. How accurate are the geographic locations?

   Accuracy of Virginia 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).

   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 20192
   USA
   

   1-888-ASK-USGS or 1-703-648-5953 (voice)
   <http://www.usgs.gov/contact/>
   

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/2005/1325/>

   • Cost to order the data: none

Who wrote the metadata?

Dates:

Last modified: 12-Sep-2005

Metadata author:

U.S. Geological Survey
Attn: Connie L. Dicken
12201 Sunrise Valley Dr. MS954
Reston, VA 20192
USA

703-648-6482 (voice)
cdicken@usgs.gov

Metadata standard:

Content Standard for Digital Geospatial Metadata (FGDC-STD-001-1998)