Brakebill, J.W. (ed) Kelley, S.K. (ed) 2000 Version 1 map USGS Water-Resources Investigations Report USGS WRIR 00-424 Baltimore, Md. U.S. Geological Survey http://water.usgs.gov/lookup/getspatial?hgmr Generalized lithology (rock type) and physiography based on geologic formations were used to characterize hydrgeomorphic regions (HGMR) within the Chesapeake Bay watershed. These HGMRs were used in conjunction with existing data to assess the significance of ground-water discharge as a source of nitrate load to nontidal streams in the Chesapeake Bay watershed (Bachman and others, 1998). This work is part of the U.S. Geological Survey's (USGS) Chesapeake Bay initative to develop an understanding and provide scientific information for the restoration of the Chesapeake Bay and its watershed (Phillips and Caughron, 1997). This data set was used to compare base-flow and ground-water nitrate loads to assess the significance of ground-water discharge as a source of nitrate load to nontidal streams in the Chesapeake Bay watershed. Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the U.S. Geological Survey. Although this Federal Geographic Data Committee-compliant metadata file is intended to document the data set in nonproprietary form, as well as in ARC/INFO format, this metadata file may include some ARC/INFO-specific terminology. The HGMR data set is the result of combining digital data sets of physiography and rock type from numerous sources. This supplemental_information section describes the creation of the physiographic and rock type data sets (Langland and others, 1995) used to create the HGMR data set. Specific processes regarding the creation of the HGMR data set can be found in the data_quality_information section of this metadata. Physiography and Lithology Digital data sets of physiographic provinces and rock types were assembled by grouping and generalizing geologic formation boundaries from existing geologic and physiographic digital data sets based on State geologic maps within the Chesapeake Bay drainage area. For areas in the Bay drainage where digital data did not exist, State geologic maps were digitzed and attributed with a geologic formation abbreviation. A large part of the digital geology used to create this data set was compiled by the USGS Appalachian-Piedmont Regional Aquifer Systems Analysis (APRASA) study (Swain & others, 1991; Mesko, 1992). The physiographic province determination is based on the geologic formations within each state. In some instances, discrepancies in geologic formations occur along the State boundaries. These discrepancies will also occur in the physiographic and rock type data sets. Each polygon was attributed with an abbreviation for either a particular physiographic province or section. Valid values APPL - Appalachian Plateau Province APMN - Appalachian Mountain Section GV - Great Valley Section BR - Blue Ridge Province RP - Reading Prong Section MELO - Mesozoic Lowlands Section PDLO - Piedmont Lowland Section PDUP - Piedmont Upland Section CP - Coastal Plain Province A spatial dissolve was performed using the ArcInfo DISSOLVE command on the polygon attribute that contained the physiographic abbreviation. The result was a digital data set of physiographic provinves in the Chesapeake Bay drainage area. Rock type determination (similar lithologic and geologic characteristics) was also based on the State geologic maps and the descriptive information about each geologic formation. Each geologic formation polygon was coded with an abbreviation for rock type. Rock types included the composition of Carbonate (C), Silicate (N), Crystalline (X), and Unconsolidated Sediment (S). A spatial dissolve was performed using the ArcInfo DISSOLVE command on the polygon attribute that contained the rock type addreviation. The result was a digital data set of rock type in the Chesapeake Bay region. All existing digital geologic and physiographic data sets collected within the Chesapeake Bay Drainage Basin were received in the ArcInfo export file format. A Chesapeake Bay drainage boundary was created using the GIRAS 1:250,000-scale hydrologic unit digital data set and used as the boundary extent for the data sets. The specific documentation for each State geologic or physiographic digital data set resides with the individual State. In some cases, there is no documentation for the creation of the digital data set, only a reference to the base map. Physiographic Province or Rock Type digital data sets were not reviewed (Langland and others, 1995). The following References were used in the creation of physiographic provinces and rock type digital data sets: Berg, T.M., and others, 1980, Geologic Map of Pennsylvania: Pennsylvania Department of Environmental Resources, scale 1:250,000, 2 sheets. Cadwell, D.H., and Gerhard, D.A., 1993, Digital Bedrock Geologic Map of New York: Open-File 1g847. Cleaves, E.T., and others, 1968, Geologic Map of Maryland: Maryland Geological Survey, scale 1:250,000, 1 sheet. Fenneman and Johnson, 1946, Physical Divisions of the United States: Washington, D.C., U.S. Geological Survey special map series, scale 1:7,000,000. Fenneman, N.M., 1938, Physiography of Eastern United States: New York, N.Y., McGraw-Hill, 691 p. Ficher, D.W., Isachsen, Y.W., and Rickard, I.V., 1970, Data from New York State Museum Map and Chart Series Number 15, Geologic Map of New York: Digital data prepared by D. Gerhard and Schauble. Hoskins, D.M., Digital Data of Pennsylvania Physiographic Provinces, Pennsylvania Department of Environmental Resources, Bureau of Topographic and Geologic Survey, scale 1:500,000. Jonas, 1968, Geologic Map of Virginia, scale 1:500,000. Mesko, T.O., 1992, Appalachian-Piedmont Regional Aquifer System Analysis (APRASA) (Provisional data): U.S. Geological Survey, Richmond, Va. Mixon, R.B., 1989, Geologic Map and generalized cross sections of the Coastal Plain and adjacent parts of the Piedmont, Virginia: U.S. Geological Survey Miscellaneous Investigations Series Map I-2033, 2 sheets, scale 1:250,000. Swain, L.S., Plan of the study for the Regional Aquifer- System Analysis of the Appalachian Valley and Ridge, Piedmont, and Blue Ridge Physiographic Provinces of the Eastern and Southeastern United States, with a description of the study-area geology and geohydrology: U.S. Geological Survey Water-Resources Investigations Report 91-4066, 44 p. 2000 Ground Condition Complete None Planned -80.56273597 -73.87702521 43.55644159 36.5134679 (keyword) Hydrogeomorphic Region (keyword) HGMR (keyword) Geology (keyword) Lithology (keyword) Physiographic (keyword) Physiography (keyword) Province (keyword) Rock (keyword) Rock Type inlandWaters (keyword) Chesapeake Bay (keyword) Mid-Atlantic None These data should not to be used at scales greater than 1:250,000. John Brakebill U.S. Geological Survey Geographer mailing and physical address

8987 Yellow Brick Road

Baltimore Maryland 21237 USA 1-888-275-8747 410-238-4210 (jwbrakeb@usgs.gov) http://md.water.usgs.gov/gis/chesbay/hgmr.jpg Hydrogeomorphic Regions in the Chesapeake Bay JPEG > Harlow, G.E. Jr., U.S. Geological Survey, Richmond, Va. (804)-261-2600 > Nelms, D.L., U.S. Geological Survey, Richmond, Va. (804)-261-2600 > Bachman, L.J., U.S. Geological Survey, Baltimore, Md. (410)-238-4200 > Powars, D., U.S. Geological Survey, Reston, Va. (804)-261-2619 Windows_NT, 4.0, Intel ARC/INFO version 7.2.1 Bachman, L.J. Lindsey, B.D. Brakebill, J.W. Powars, D.S. 1998 Report Water-Resources Investigations Report 98-4059 Baltimore, Md. U.S. Geological Survey http://md.water.usgs.gov/publications/wrir-98-4059/ Compared attrbutes with paper/mylar map sheets Polygon topology present. All Polygons are closed and have label points. Dashed formation contacts on the Virginia State geology map used to differentiate between carbonate and silicate compositions in the Omuu formation are not present in the HGMR digital data set. The Reading Prong area of Pennsylvania was not provincially differentiated in the physiography data, however, as noted by Fenneman (1938, p. 368), "Almost all that has been said about the topography and the geomorphic history of the Blue Ridge is true of the Reading Prong." Therefore, polygons in this area that were tagged as "VR" and "PD" provincially, were tagged as a "BR" HGMR in the data set (Harlow and Nelms, 1998). None applied Bachman, L.J. 1997 map written communication written communication Baltimore, Md. U.S. Geological Survey Digital Data 1998 Ground Conditions None Determination of HGMR in the Chesapeake Bay watershed based on physiography and rock type. Fenneman, N.M. 1938 Report UnKnown Unknown New York, N.Y. McGraw-Hill Report 1938 Ground Conditions None Reference Harlow, G.E. (ed) Nelms, D.L. (ed) 1998 map written communication written communication Richmond, Va. U.S. Geological Survey 250000 Digital Data, Arc/Info export 1998 Ground Conditions None Detailed testing and correction of digital HGMR data from Coastal Plain to Appalachian Plateau, Chesapeake Bay watershed. Langland, M.J., Lietman, P.L. Hoffman, S.A. 1995 Report U.S. Geological Survey Water-Resources Investigations Report 95-4233 Harrisburg, Pa. USGS 250000 Digital Data, Arc/Info export files 1995 Ground Condition None Rock type and physiographic province digital data sets. Mesko, T.O. 1992 map Provisional unpublished data Provisional unpublished data Richmond, Va. U.S. Geological Survey 250000 Digital Data, Arc/Info export 1992 Ground Conditions None Digital Geologic data from Coastal Plain to Appalachian Plateau. Mixon, R.B. 1989 (map) Miscellaneous Investigations Series Map I-2033, 2 sheets Virginia U.S. Geological Survey 250000 paper map 1989 Ground Conditions None Map information Phillips, S.W. Caughron, W.R. 1997 Report Fact Sheet FS-124-97 http://md.water.usgs.gov/publications/fs-124-97/ U.S. Geological Survey Report 1997 Publication Data None Reference Powars, D.S. 1997 map Unpublished data, written communication written communication Reston, Va. U.S. Geological Survey 250000 Mylar separate 1998 Ground Conditions None Boundaries of Coastal Plain HGMR's registered to USGS 1:250,000 topographic maps. Swain, L.S. 1991 Report Water-Resources Investigations Report 91-4066, 44 p. Richmond, Va. U.S. Geological Survey Report 1991 Ground Conditions Reference Reference Data sets of physiography and rock type (Langland and others, 1995)were merged to create one data set. Polygons representing the combinations of rock type and physiography determined the HGMR classification (Bachman, 1997). All possible combinations were not included in a HGMR classification because they did not occur, were not mapped on the source maps, or were not mapped in a consistent manner. An example would be unconsolidated alluvial deposits and glacial deposits found in the Valley and Ridge and Appalachian Plateau Provinces. Mixed rock types were considered carbonate. A spatial DISSOLVE was performed on the item that contained the HGMR addreviation, and the result was the HGMR data set. 1997 The Coastal Plain HGMR was sub-divided into lowlands, uplands, and dissected uplands (Powars, 1997). Boundaries for these divisions were drawn on mylar sheets registered to U.S. Geological Survey 1:250,000 topographic map sheets. Boundaries were digitized and snapped to the existing HGMR data set. Newly created polygons were attributed with the appropirate abbreviation representing the new HGMR. This HGMR data set was used to assist in the analysis of ground-water discharge as a source of nitrate load to nontidal streams in the Chesapeake Bay watershed (Bachman and others, 1998). 1997 During detailed testing (Harlow and Nelms, 1998), it was observed that some HGMR's were classified incorrectly due to map shifts, polygon labeling errors in physiography or rock type, or anomalies generated by the overlay and dissolve operations used to create the physiography, rock type, and HGMR data sets. One example shows marble formations labeled as a crystalline lithology in the rock type data set, and therefore were incorrectly tagged as "PCR" in the HGMR data set. 19971201 To correct these anomalies, digital geologic formation data, mainly composed of information compiled by the USGS Appalachian-Piedmont Regional Aquifer Systems Analysis (APRASA) study (Swain & others, 1991; Mesko, 1992) originally used in part to create the physiography and rock type data sets (Langland and others, 1995) were re-evaluated for both physiography and rock type abbreviations (one data set). Polygons representing the combinations of rock type and physiography determined the HGMR classification based on what was developed by Bachman, 1997, and Bachman and others (1998). Mixed rock (M) types were considered carbonate. 19980122 As a final quality check, the table listed in the Entity_and_Attribute section, was generated to compare HGMR classifications with the formation lithologic descriptions on the Virginia, Maryland, Delaware, West Virginia, and Pennsylvania State geologic maps. Numerous modifications were made only to the HGMR classification during this phase. Incorrect identifications of formation lithologies were not corrected, and exist in the table. HGMR from the Appalachian Plateau and Coastal Plain Provinces remained unchanged from previous work. 19980122 A spatial DISSOLVE was performed on the item that contained the HGMR addreviation, and the result was the HGMR data set. See the Entity_and_Attribute section for details on the HGMR attribute. 2000 First draft of metadata created by jwbrakeb using FGDCMETA.AML ver. 1.31 10/16/98 on ARC/INFO data set p:\chesbay\geo\test 20000321 Vector Point 1588 String 3072 GT-polygon composed of chains 1589 Albers Conical Equal Area 29.5 45.5 -96 23 0.00000 0.00000 coordinate pair 0.002 0.002 Meters North American Datum of 1983 GRS1980 6378206.4 294.98 > > >HGMR.PAT: > >COLUMN ITEM NAME WIDTH OUTPUT TYPE N.DEC ALTERNATE NAME > 1 AREA 8 18 F 5 > 9 PERIMETER 8 18 F 5 > 17 HGMR# 4 5 B - > 21 HGMR-ID 4 5 B - > 54 HGMR 3 3 C - > > Valid codes for HGMR > > APC - Appalachian Plateau Carbonate > APS - Appalachian Plateau Siliciclastic > BR - Blue Ridge > CPD - Coastal Plain Dissected Uplands > CPL - Coastal Plain Lowlands > CPU - Coastal Plain Uplands > ML - Mesozoic Lowlands > PCA - Piedmont Carbonate > PCR - Piedmont Crystalline > VRC - Valley and Ridge Carbonate > VRS - Valley and Ridge Siliciclastic > >****************************************************************** > Listed below is a table generated to cross-reference polygons > by state and formation into HGMR classifications. Except for > HGMR, these attributes are not maintained in this data set. > The Lithology column represents what was originally coded > when rock type was determined. The HGMR column represents > what is currently in the attributed item HGMR in the data set. > The HGMR attribute reflects any corrections made to the > data set during the detailed testing processing step > (Harlow and Nelms, 1998). > >Formation State Type Province Lithology Hgmr > a DE AMPH PD X PCR > an DE ANRS PD X PCR > bas DE SCST PD X PCR > bm DE GRVL PD S CPU > bqfg DE GNSS PD X PCR > ch DE CHRN PD X PCR > Cm DE MRBL PD X PCA > fmg DE GNSS PD X PCR > gv DE GNSS PD X PCR > hp DE GNSS PD X PCR > hqa DE GNSS PD X PCR > n DE NORT PD X PCR > na DE NORT PD X PCR > Qt DE SAND PD S CPU > s DE SRPN PD X PCR > S DE SRPN PD X PCR > wa DE AMPH PD X PCR > Wa DE AMPH PD X PCR > Wp DE TUFF PD S PCR > bgb MD GBBR PD X PCR > Ca MD QRTZ PD X PCR > Ca MD QRTZ BR X BR > Ca MD QRTZ VR X BR > cc MD METACGLM PD X PCR > Ce MD LMSN VR C VRC > Cf MD LMSN BR C BR > Cf MD LMSN PD C PCA > cm MD MRBL PD X PCA > Ct MD DLMT VR C VRC > Ct MD DLMT BR C BR > Cwb MD SLSN VR N VRS > Dch MD SDSL VR N VRS > Dh MD SHLE VR N VRS > Dhn MD SHLE VR N VRS > Do MD QRTZ VR X VRS > DShk MD LMSN VR C VRC > gm MD DORT PD X PCR > hf MD SHLE PD N PCR > hf MD SHLE BR N BR > hf MD SHLE VR N BR > if MD PHLL PD X PCR > if-ms MD PHLL PD X PCR > jg MD GNSS PD X PCR > Kp MD GRVL PD S CPU > lf MD PHLL BR X BR > lmr MD RYLT PD X PCR > Mg MD SDSL VR N VRC > mgb MD GBBR PD X PCR > Mmc MD SDSL VR N VRS > Mp MD SNDS VR N VRS > ms MD SCST PD X PCR > OCc MD LMSN VR C VRC > OCg MD LMSN PD C PCA > Ocs MD LMSN VR C VRC > Oj MD SLSN VR N VRS > Om MD SHLE VR N VRS > Ops MD DLMT VR C VRC > Orr MD LMSN VR C VRC > Os MD LMSN VR C VRC > Pap MD SDSL VR N VRS > pbs MD SLTE PD X PCR > pCbg MD GNSS PD X PCR > pCc MD BSLT BR X BR > pCg MD GNSS BR X BR > pCmv MD RYLT BR X BR > pCsr MD QRTZ BR X BR > Pze MD GRDT PD X PCR > Pzg MD MNZT PD X PCR > Pzgd MD GBBR PD X PCR > Pzgg MD GRNT PD X PCR > Pzk MD DORT PD X PCR > Pzmg MD GNSS PD X PCR > Pzn MD DORT PD X PCR > Pzp MD PGMT PD X PCR > Pzpd MD GNSS PD X PCR > Pzr MD DORT PD X PCR > Pzw MD MNZT PD X PCR > Ql MD GRVL PD S CPU > QTu MD GRVL PD S CPU > Qu MD GRVL PD S CPU > Sc MD SHLE VR N VRS > scm MD BSLT PD X PCR > sf MD GNSS PD X PCR > Sm MD LMSH VR M VRC > sq MD QRTZ PD X PCR > srl MD LMSN PD C PCA > St MD SNDS VR N VRS > Stl MD LMSN VR C VRC > Swb MD LMSN VR C VRC > Trd MD DIBS PD X ML > Trg MD SHLE PD N ML > Trlc MD CGLM PD N ML > Trno MD SNDS PD N ML > Trqc MD CGLM PD N ML > uf MD PHLL PD X PCR > ug MD GBBR PD X PCR > um MD SRPN PD X PCR > vc MD GNST PD X PCR > wbg MD GNSS PD X PCR > wf MD PHLL BR X BR > wlps MD SCST PD X PCR > wm MD MRBL PD X PCA > wmg MD METAGRCK PD X PCR > wu MD SCST PD X PCR > wups MD SCST PD X PCR > Ca PA QRTZ PD X PCR > Ca PA QRTZ BR X BR > Ca PA QRTZ VR X VRS > Cah PA QRTZ PD X PCR > Cal PA DLMT VR C VRC > Cal PA DLMT PD C BR > Cal PA DLMT PD C VRC > Cal PA DLMT PD C PCA > Cbs PA LMSN VR C VRC > Cbs PA LMSN PD C PCA > Cch PA SCST PD X PCR > Ce PA LMSN PD C PCA > Ce PA LMSN VR C VRC > Cg PA DLMT VR C VRC > Cgl PA DLMT VR C VRC > Cgm PA DLMT VR C VRC > Ch PA PHLL PD X PCR > Ch PA PHLL BR X BR > Cha PA QRTZ PD X BR > Cha PA QRTZ VR X VRS > Cha PA QRTZ PD X PCR > Chm PA PHLL BR X BR > Chm PA PHLL PD X BR > Ck PA SHLE PD N PCA > Cl PA DLMT PD C PCA > Clv PA DLMT VR C VRC > Clv PA DLMT PD C BR > Clv PA DLMT PD C VRC > Clv PA DLMT PD C PCA > Cm PA LMSN VR C VRC > Cm PA LMSN PD C PCA > Cms PA LMDM VR C VRC > Cph PA LMSH VR M VRC > Cr PA LMDM VR C VRC > Cr PA LMDM PD C PCA > Csb PA SHLE PD N PCA > Csc PA DLMT VR C VRC > Csc PA DLMT PD C PCA > Csg PA LMSN VR C VRC > Ct PA DLMT VR C VRC > Ct PA DLMT PD C ML > Ct PA DLMT BR C BR > Cv PA DLMT PD C PCA > Cw PA LMDM VR C VRC > Cwb PA SDSL VR N VRS > Cwl PA CGLM BR N BR > Cwl PA CGLM PD N BR > Cz PA LMSN VR C VRC > Czc PA DLMT PD C PCA > Dbe PA SDSL VR N VRC > Dbh PA SHLE VR N VRS > Dcb PA SNDS VR N VRS > Dcbr PA SLSN VR N VRS > Dcbs PA SNDS VR N VRS > Dccf PA SNDS VR N VRS > Dcd PA SNDS VR N VRS > Dciv PA SNDS VR N VRS > Dck PA SNDS VR N VRS > Dclr PA SNDS VR N VRS > Dcp PA SNDS VR N VRS > Dcpg PA CGLM VR N VRS > Dcsc PA SLSN VR N VRS > Dct PA SNDS VR N VRS > Dcw PA SNDS VR N VRS > Dcwt PA SNDS VR N VRS > Df PA SNDS VR N VRS > Dh PA SHLE VR N VRS > Dlh PA SNDS VR N VRS > Dm PA SHLE VR N VRS > Dmh PA SHLE VR N VRS > Don PA LMSH VR M VRC > Doo PA LMSN VR C VRC > Dor PA SNDS VR N VRS > Dosn PA LMSN VR C VRC > Drc PA LMSH VR M VRC > Ds PA SLSN VR N VRS > DSkc PA LMSN VR C VRC > DSkm PA LMSN VR C VRC > DSkt PA LMSN VR C VRC > DSop PA LMSH VR M VRC > Dtr PA SLSN VR N VRS > fgh PA GNSS PD X PCR > fgp PA GNSS PD X PCR > fm PA MRBL VR X VRC > fm PA MRBL PD X PCA > gg PA GNSS PD X BR > gg PA GNSS PD X PCR > gga PA GBBR PD X PCR > ggd PA GNSS PD X BR > ggd PA GNSS PD X PCR > gn PA GNSS VR X VRS > gn PA GNSS PD X BR > gn PA GNSS PD X PCR > gqm PA GNSS PD X BR > gqm PA GNSS PD X PCR > hg PA GNSS PD X BR > hg PA GNSS VR X BR > hg PA GNSS VR X VRS > Kp PA CLAY PD S CPU > Mb PA SNDS VR N VRS > mb PA BSLT PD X PCR > mb PA BSLT BR X BR > md PA DIBS PD X BR > md PA DIBS PD X PCR > MDhm PA SNDS VR N VRS > MDpr PA SNDS VR N VRS > MDr PA SNDS VR N VRS > MDsk PA SNDS VR N VRS > mgh PA GNSS PD X PCR > mgp PA GNSS PD X PCR > Mmc PA SHLE VR N VRS > Mp PA SNDS VR N VRS > mr PA RYLT PD X PCR > mr PA RYLT BR X BR > Oa PA LMSN VR C VRC > Oan PA LMSN VR C VRC > Oan PA LMSN PD C PCA > Ob PA DLMT VR C VRC > Ob PA DLMT PD C PCA > Ob PA DLMT PD C ML > Oba PA DLMT VR C VRC > Obe PA SNDS VR N VRS > Obf PA DLMT VR C VRC > Obl PA LMSN VR C VRC > Oc PA LMSH VR M VRC > OCc PA LMSN PD C PCA > Ocl PA LMSN VR C VRC > Ocn PA LMSH VR M VRC > Oco PA SHLE PD N PCR > Od PA DIBS VR X VRS > Oe PA LMSN VR C VRC > Oe PA LMSN PD C PCA > Oe PA LMSN PD C VRC > Oe PA LMSN PD C BR > Oh PA SHLE VR N VRS > Oh PA SHLE PD N VRS > Oh PA SHLE PD N ML > Oha PA LMSN PD C PCA > Ohe PA ANDS VR X VRS > Ohg PA GRCK VR N VRS > Ohl PA SHLE VR N VRC > Ohm PA LMSH VR M VRC > Ohm PA LMSH PD M PCA > Ohsg PA SHLE VR N VRS > Oj PA SLSN VR N VRS > Ojb PA SLSN VR N VRS > Ojk PA LMSH VR M VRC > Om PA SHLE VR N VRS > Om PA SHLE PD N ML > Omgs PA SHLE VR N VRS > Oml PA SHLE VR N VRC > On PA DLMT VR C VRC > Ons PA DLMT VR C VRC > Oo PA DLMT VR C VRC > Oo PA DLMT PD C VRC > Oo PA DLMT PD C PCA > Ops PA DLMT VR C VRC > Or PA SHLE VR N VRS > Ori PA DLMT VR C VRC > Ori PA DLMT PD C VRC > Orr PA LMSN VR C VRC > Os PA LMSN VR C VRC > Os PA LMSN PD C PCA > Osl PA LMSN VR C VRC > Osp PA LMSN VR C VRC > Pa PA SNDS VR N VRS > Pc PA SDSL VR N VRS > Pl PA SDSL VR N VRS > Pp PA CGLM VR N VRS > Qt PA GRVL PD S ML > Qt PA GRVL PD S CPU > Sb PA SLSN VR N VRS > Sbm PA SHLE VR N VRS > Sc PA SHLE VR N VRS > Sdp PA LMSH VR M VRC > Ss PA CGLM VR N VRS > St PA SNDS VR N VRS > Swc PA LMSH VR M VRC > Tbm PA SAND PD S CPU > Tpb PA SAND PD S CPU > Trb PA SHLE PD N ML > Trd PA DIBS PD X ML > Trd PA DIBS VR X ML > Trd PA DIBS PD X PCR > Trd PA DIBS BR X ML > Trfl PA CGLM PD N ML > Trfq PA CGLM PD N ML > Trg PA MDSN PD N ML > Trgc PA CGLM PD N ML > Trgh PA SHLE PD N ML > Trh PA SNDS PD N ML > Trhc PA CGLM PD N ML > Trl PA ARGL PD N ML > Trn PA MDSN PD N ML > Trn PA MDSN PD N PCR > Trnc PA CGLM PD N ML > Trs PA SNDS PD N ML > Trs PA SNDS PD N PCR > Trsc PA CGLM PD N ML > vs PA SCST PD X PCR > vs PA SCST BR X BR > Xa PA ANRS PD X PCR > Xc PA MRBL PD X PCA > Xgr PA GRNT PD X PCR > Xmg PA GBBR PD X PCR > Xmgh PA GNSS PD X PCR > Xmgp PA GNSS PD X PCR > Xpb PA SLTE PD X PCR > Xpc PA SCST PD X PCR > Xpg PA PGMT PD X PCR > Xs PA SRPN PD X PCR > Xsq PA QRTZ PD X PCR > Xw PA SCST PD X PCR > Xwc PA SCST PD X PCR > Xwm PA SCST PD X PCR > Xwv PA BSLT PD X PCR > Xww PA MRBL PD X PCA > Cu TN SNDS BR N BR > pCc TN GRNT BR X BR > pCm TN VLCC BR X BR > a VA PHLL BR X BR > am VA AMPH BR X BR > am VA AMPH PD X PCR > Cch VA SNDS BR N BR > Cch VA SNDS VR N VRS > Cco VA LMDM VR C VRC > Ccr VA DLMT VR C VRC > Ccu VA LMSN VR C VRC > Ce VA DMSH VR M VRC > Cer VA SNDS BR N BR > Cer VA SNDS VR N VRS > Ch VA METASDSL BR X BR > Chk VA DLMT VR C VRC > Cl VA SLTE BR X BR > Cmc VA LMSN VR C VRC > Cn VA SHLE VR N VRC > CpCc VA BSLT BR X BR > CpCc VA BSLT PD X PCR > CpCm VA PHLL BR X BR > CpCmr VA VLCC BR X BR > CpCs VA SNDS BR N BR > Cr VA SDSL VR N VRS > Cs VA DLMT BR C BR > Cs VA DLMT VR C VRC > Cuc VA LMSN VR C VRC > Cun VA CGLM BR N BR > Cun VA CGLM VR N VRS > Cw VA METACGLM BR X BR > Db VA SHLE VR N VRS > Dch VA SHLE VR N VRS > Dhs VA SHLE VR N VRS > Dlmu VA SHLE VR N VRS > Dlmu VA SHLE VR N VRC > DS VA SDSL VR N VRS > Du VA SDSL VR N VRS > g VA VLCC PD X PCR > ghgn VA GRNT PD X PCR > gr VA GRNT BR X BR > gr VA GRNT PD X PCR > grgn VA GNSS PD X PCR > grgn VA GNSS BR X BR > hgb VA GBBR PD X PCR > hgb VA GBBR BR X BR > ig VA GRNT VR X VRS > Kptx VA SNDS PD N CPU > lm VA MRBL BR X BR > lm VA MRBL PD X PCA > m VA SCST BR X BR > m VA SCST PD X PCR > Mb VA LMSH VR M VRC > Mbp VA SDSL VR N VRS > Mcf VA LMSH VR M VRC > MDs VA SHLE VR N VRS > Mg VA LMSN VR C VRC > Mgb VA LMSN VR C VRC > mgn VA GNSS PD X PCR > Mh VA SDSL VR N VRS > Mmc VA SDSL VR N VRS > Mn VA LMSN VR C VRC > mp VA PHLL PD X PCR > Mp VA SDSL VR N VRS > Mpm VA SDSL VR N VRS > Mpo VA SNDS VR N VRS > Mpr VA SHLE VR N VRS > msch VA SCST PD X PCR > msch VA SCST BR X BR > Mu VA SNDS VR N VRS > Oa VA SLTE PD X PCR > Ob VA LMDM VR C VRC > Obr VA QRTZ PD X PCR > OC VA LMSN VR C VRC > Ocb VA LMDM VR C VRC > Och VA LMDM VR C VRC > OCk VA LMDM VR C VRC > Oku VA LMDM VR C VRC > Omkl VA LMDM VR C VRC > Omu VA LMSN VR C VRC > Omuu VA SHLE VR N VRS > Oq VA SLTE PD X PCR > Ors VA LMSH VR M VRC > pCl VA GRNT BR X BR > pCl VA GRNT PD X PCR > pCly VA PHLL PD X PCR > pCly VA PHLL BR X BR > pCma VA GRNT BR X BR > pCmn VA GNSS BR X BR > pCmn VA GNSS PD X BR > pCor VA GRNT BR X BR > pCp VA GRNT BR X BR > pCr VA ANRS BR X BR > pCrr VA GRNT BR X BR > pCrr VA GRNT PD X PCR > pCsr VA GRNT BR X BR > pCv VA GRNT BR X BR > Pl VA SDSL VR N VRS > Png VA SDSL VR N VRS > Pze VA VLCC PD X PCR > Pzlw VA GRNT PD X PCR > Pzpb VA GRNT PD X PCR > PzpCg VA TUFF PD S PCR > PzpCo VA GRNT PD X PCR > PzpCs VA SLTE PD X PCR > PzpCt VA GNSS PD X PCR > qd VA DORT PD X PCR > Scy VA LMSN VR C VRC > SO VA LMSH VR M VRC > Stc VA SDSL VR N VRS > Su VA SDSL VR N VRS > Ta VA SAND PD S CPU > Tc VA SAND PD S CPU > Trcf VA CGLM PD N ML > Trcm VA COAL PD N ML > Trd VA VLCC PD X ML > Trd VA VLCC BR X BR > Trdf VA GRCK PD N ML > Trl VA CGLM PD N ML > Trn VA CGLM PD N ML > Trnc VA CGLM PD N ML > Trns VA SNDS PD N ML > Tro VA SNDS PD N ML > Trv VA COAL PD N ML > Tu VA SAND PD S CPU > v VA VLCC PD X PCR > w VA PHLL BR X BR > Ca WV QRTZ BR X BR > Cc WV LMSN VR C VRC > Ce WV LMSH VR M VRC > Ch WV PHLL BR X BR > CPCc WV GNST BR X BR > Ct WV DLMT VR C VRC > Cw WV CGLM BR N BR > Cwy WV SDSL VR N VRS > Db WV SHLE VR N VRS > Dbh WV SHLE VR N VRS > Dch WV SLSN VR N VRS > Dh WV SHLE VR N VRS > Dhl WV LMSN VR C VRC > Dhs WV SDSL VR N VRS > Dm WV SHLE VR N VRS > Dmb WV SHLE VR N VRS > Dmn WV SHLE VR N VRS > Dmt WV SHLE VR N VRS > Dmu WV SHLE VR N VRS > Do WV SNDS VR N VRS > Dohl WV LMSN VR C VRC > Mbf WV SDSL VR N VRS > Mbp WV SDSL VR N VRC > Mg WV LMSN VR C VRC > Mh WV SDSL VR N VRS > Mmc WV SDSL VR N VRS > Mmcc WV SDSL VR N VRS > Mmp WV SDSL VR N VRS > Mp WV SNDS VR N VRS > Ob WV LMDM VR C VRC > Obps WV DLMT VR C VRC > Obr WV LMSN VR C VRC > Obrr WV LMDM VR C VRC > Obs WV LMSN VR C VRC > Ojo WV SNDS VR N VRS > Om WV SHLE VR N VRS > Omc WV LMSN VR C VRC > Osp WV LMSN VR C VRC > Ot WV LMSH VR M VRC > Otbr WV LMSH VR M VRC > Pa WV SDSL VR N VRS > Pc WV SDSL VR N VRS > Pk WV SNDS VR N VRS > Pnr WV SNDS VR N VRS > Pp WV SNDS VR N VRS > Ppv WV SNDS VR N VRS > Qal WV SGVC VR S VRS > Sct WV SDSL VR N VRS > Smc WV SDSL VR N VRS > St WV SNDS VR N VRS > Stw WV LMSH VR M VRC none U.S. Geological Survey Ask USGS - Water Webserver Team mailing

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Reston VA 20192 1-888-275-8747 (1-888-ASK-USGS) http://pubs.usgs.gov/circ/circ1112/ Although this data set has been used by the U.S. Geological Survey, U.S. Department of the Interior, no warranty expressed or implied is made by the U.S. Geological Survey as to the accuracy of the data and related materials. The act of distribution shall not constitute any such warranty, and no responsibility is assumed by the U.S. Geological Survey in the use of this data, software, or related materials. Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the U.S. Government. Export Full coverage zipped 1 http://water.usgs.gov/GIS/dsdl/hgmr.e00.gz SDTS sdts coverage zipped 1 http://water.usgs.gov/GIS/dsdl/hgmr.tar.gz None. This dataset is provided by USGS as a public service. 20041108 U.S. Geological Survey Ask USGS -- Water Webserver Team mailing

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Reston VA 20192 1-888-275-8747 (1-888-ASK-USGS) http://answers.usgs.gov/cgi-bin/gsanswers?pemail=h2oteam&subject=GIS+Dataset+hgmr FGDC Content Standards for Digital Geospatial Metadata FGDC-STD-001-1998