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Preliminary Lithogeochemical Map Showing Near-Surface Rock Types in the Chesapeake Bay Watershed, Virginia and Maryland

Metadata also available as - [Questions & Answers] - [Parseable text] - [DIF]

Metadata:

Identification_Information
Data_Quality_Information
Spatial_Data_Organization_Information
Spatial_Reference_Information
Entity_and_Attribute_Information
Distribution_Information
Metadata_Reference_Information

Identification_Information:

Citation:

Citation_Information:

Originator: John D. Peper

Originator: Lucy B. McCartan

Originator: J. Wright Horton, Jr.

Originator: James E. Reddy

Publication_Date: 2001

Title:

Preliminary Lithogeochemical Map Showing Near-Surface Rock Types in the Chesapeake Bay Watershed, Virginia and Maryland

Edition: 1.0

Geospatial_Data_Presentation_Form: Map

Series_Information:

Series_Name: U.S. Geological Survey Open-File Report
Issue_Identification: 01-187

Publication_Information:

Publication_Place: Reston, Virginia
Publisher: U.S. Geological Survey

Online_Linkage: <http://pubs.usgs.gov/openfile/of01-187/>

Description:

Abstract:: This preliminary experimental lithogeochemical map shows the distribution of rock types in the Virginia and Maryland parts of the Chesapeake Bay watershed. The map was produced digitally by classifying geologic-map units according to composition, mineralogy, and texture; rather than by age and stratigraphic relationships as shown on traditional geologic maps. This map differs from most lithologic maps in that the lithogeochemical unit classification distinguishes those rock units having key water-reactive minerals that may induce acid neutralization, or reduction, of hosted water at the weathering interface. The validity of these rock units, however, is independent of water chemistry, because the rock units are derived from geologic maps and rock descriptions. Areas of high soil carbon content, and sulfide metal deposits are also shown.
Water-reactive minerals and their weathering reactions yield five lithogeochemical unit classes: 1) carbonate rock and calcareous rocks and sediments, the most acid-neutralizing; 2)carbonaceous-sulfidic rocks and sediments, oxygen-depleting and reducing; 3) quartzofeldspathic rocks and siliciclastic sediments, relatively weakly reactive with water; 4) mafic silicate rocks/sediments, oxygen consuming and high solute-load delivering; and, 5) the rarer calcareous-sulfidic (carbonaceous) rocks, neutralizing and reducing. Earlier studies in some parts of the map area have related solute loads in ground and stream waters to some aspects of bedrock lithology. More recent preliminary tests of relationships between four of the classes of mapped lithogeochemical units and ground water chemistry, in the Mid-Atlantic area using this map, have focused on and verified the nitrate-reducing and acid-neutralizing properties of some bedrock and unconsolidated aquifer rock types. Sulfide mineral deposits and their mine-tailings effects on waters are beginning to be studied by others. Additional testing of relationships among the lithogeochemical units and aspects of ground and surface water chemistry could help to refine the lithogeochemical classification, and this map. The testing could also improve the usefulness of the map for assessing aquifer reactivity and the transport properties of reactive contaminants such as acid rain, and nitrate from agricultural sources, in the Chesapeake Bay watershed.
Purpose:: The purpose of this preliminary digital map is to provide a geographically referenced data base showing regional patterns in the distribution of rock types in the Virginia and Maryland parts of the Chesapeake Bay watershed. The map may be used to evaluate the hypothesis that lithology of rocks and sediments significantly influences the chemistry and quality of waters traveling over and through them on a regional scale.
Supplemental_Information:: Data were originally collected in UTM coordinates, zone 18, NAD 1927, and projected to geographic coordinates (Lat/Long), NAD 1983. The data base is accompanied by a large format color map, a readme.txt file, and a explanatory PDF pamphlet.

Data_Set_Structure:

Data_Set_Part:

Part_Type:

Arc/Info coverages, INFO tables, and their export-interchange file equivalents (files with *.e00 extensions)

Part_Name: Maryland and Virginia geologic map data

Part_Description:

These coverages and INFO tables provide the scientific content of the mapped data

Data_Set_Part:

Part_Type: Arc/Info coverage
Part_Name: GEOLOGY
Part_Description: Polygon coverage for the contacts of geologic map units

Data_Set_Part:

Part_Type: Arc/Info coverage
Part_Name: LITHOGEO
Part_Description: Polygon coverage for the contacts of lithogeochemical map units

Data_Set_Part:

Part_Type: Arc/Info coverage
Part_Name: CARBON
Part_Description: Polygon coverage of the carbon-rich soils

Data_Set_Part:

Part_Type: Arc/Info coverage
Part_Name: SULFIDE
Part_Description: Point coverage of sulfide deposits

Data_Set_Part:

Part_Type: INFO table
Part_Name: GEOLLITH
Part_Description: INFO table that relates the items GEOL_CODE and LITH_CODE

Data_Set_Part:

Part_Type: INFO table
Part_Name: LITHTBL
Part_Description:: INFO table that relates the item LITH_CODE to the following items: ROCK_TYPE_GROUP, SUB_GROUP, MAP_UNIT, ROCK_TYPE_CLASS, MINERALOGY, and WATER_CHEMISTRY

Data_Set_Part:

Part_Type: INFO table
Part_Name: TBL_REL
Part_Description:: INFO table that stores the relate environments for the INFO tables GEOLLITH and LITHTBL

Data_Set_Part:

Part_Type:

Arc/Info coverages and their export-interchange file equivalents (files with *.e00 extensions)

Part_Name: Maryland and Virginia base map data

Part_Description:

These coverages provide the base map to which the geologic information is geographically registered

Data_Set_Part:

Part_Type: Arc/Info coverage
Part_Name: POLBND
Part_Description: Polygon coverage of county boundaries

Data_Set_Part:

Part_Type: ArcView shapefiles (*.dbf, *.shp, *.shx) and related DBF tables

Part_Name: Maryland and Virginia geologic map data

Part_Description:

These shapefiles and DBF tables provide the scientific content of the mapped data

Data_Set_Part:

Part_Type: ArcView shapefiles
Part_Name: GEOLOGY.*
Part_Description: Shapefiles for the contacts of geologic map units

Data_Set_Part:

Part_Type: ArcView shapefiles
Part_Name: LITHOGEO.*
Part_Description: Shapefiles for the contacts of lithogeochemical map units

Data_Set_Part:

Part_Type: ArcView shapefiles
Part_Name: CARBON.*
Part_Description: Shapefiles for the carbon-rich soils

Data_Set_Part:

Part_Type: ArcView shapefiles
Part_Name: SULFIDE.*
Part_Description: Shapefiles for the sulfide deposits

Data_Set_Part:

Part_Type: DBF table
Part_Name: GEOLLITH.DBF
Part_Description: DBF table that relates the items GEOL_CODE and LITH_CODE

Data_Set_Part:

Part_Type: DBF table
Part_Name: LITHTBL.DBF
Part_Description:: DBF table that relates the item LITH_CODE to the following items: ROCK_GROUP, SUB_GROUP, MAP_UNIT, ROCK_CLASS, MINERALOGY, and WATER_CHEM

Data_Set_Part:

Part_Type: ArcView shapefiles (*.dbf, *.shp, *.shx)

Part_Name: Maryland and Virginia base map data

Part_Description:

These shapefiles provide the base map to which the geologic information is geographically registered

Data_Set_Part:

Part_Type: ArcView shapefiles
Part_Name: POLBND.*
Part_Description: Shapefiles for the county boundaries

Data_Set_Part:

Part_Type:

Abicas delimited ASCII files (*.def, *.pfa, *.pxy, *.un, *.xfa) and related delimited ASCII tables (*.txt)

Part_Name: Maryland and Virginia geologic map data

Part_Description:

These Abicas ASCII files provide the scientific content of the mapped data

Data_Set_Part:

Part_Type: Abicas ASCII files
Part_Name: GEOLOGY.*
Part_Description: Abicas files for the contacts of geologic map units

Data_Set_Part:

Part_Type: Abicas ASCII files
Part_Name: LITHOGEO.*
Part_Description: Abicas files for the contacts of lithogeochemical map units

Data_Set_Part:

Part_Type: Abicas ASCII files
Part_Name: CARBON.*
Part_Description: Abicas files for the carbon-rich soils

Data_Set_Part:

Part_Type: Abicas ASCII files
Part_Name: SULFIDE.*
Part_Description: Abicas files for the sulfide deposits

Data_Set_Part:

Part_Type: Abicas ASCII files
Part_Name: GEOLLITH.*
Part_Description: Table that relates the items GEOL_CODE and LITH_CODE

Data_Set_Part:

Part_Type: Abicas ASCII files
Part_Name: LITHTBL.*
Part_Description:: Table that relates the item LITH_CODE to the following items: ROCK_TYPE_GROUP, SUB_GROUP, MAP_UNIT, ROCK_TYPE_CLASS, MINERALOGY, and WATER_CHEMISTRY

Data_Set_Part:

Part_Type: Abicas delimited ASCII files (*.def, *.pfa, *.pxy, *.un, *.xfa)

Part_Name: Maryland and Virginia base map data

Part_Description:

These Abicas ASCII files provide the base map to which the geologic information is geographically registered

Data_Set_Part:

Part_Type: Abicas ASCII files
Part_Name: POLBND.*
Part_Description: Abicas files for the county boundaries

Time_Period_of_Content:

Time_Period_Information:

Range_of_Dates/Times:

Beginning_Date: 1995
Ending_Date: 2001

Currentness_Reference: Publication date

Status:

Progress: Complete
Maintenance_and_Update_Frequency: None planned

Spatial_Domain:

Bounding_Coordinates:

West_Bounding_Coordinate: -80.75
East_Bounding_Coordinate: -75.00
North_Bounding_Coordinate: 39.75
South_Bounding_Coordinate: 36.50

Keywords:

Theme:

Theme_Keyword_Thesaurus: none
Theme_Keyword: Virginia
Theme_Keyword: Maryland
Theme_Keyword: Chesapeake
Theme_Keyword: Bay
Theme_Keyword: Watershed
Theme_Keyword: Lithogeochemical
Theme_Keyword: Geologic
Theme_Keyword: Geology

Theme:

Theme_Keyword_Thesaurus: ISO 19115 Topic Categories
Theme_Keyword: geoscientificInformation

Place:

Place_Keyword_Thesaurus: None
Place_Keyword: Virginia
Place_Keyword: Maryland
Place_Keyword: Chesapeake
Place_Keyword: Bay
Place_Keyword: Watershed

Place:

Place_Keyword_Thesaurus: Augmented FIPS 10-4 and FIPS 6-4, version 1.0
Place_Keyword: US24 = Maryland
Place_Keyword: 51001 = Accomack
Place_Keyword: 51003 = Albemarle
Place_Keyword: 51005 = Alleghany
Place_Keyword: 51007 = Amelia
Place_Keyword: 51009 = Amherst
Place_Keyword: 51011 = Appomattox
Place_Keyword: 51013 = Arlington
Place_Keyword: 51015 = Augusta
Place_Keyword: 51017 = Bath
Place_Keyword: 51019 = Bedford
Place_Keyword: 51023 = Botetourt
Place_Keyword: 51029 = Buckingham
Place_Keyword: 51031 = Campbell
Place_Keyword: 51033 = Caroline
Place_Keyword: 51036 = Charles City
Place_Keyword: 51041 = Chesterfield
Place_Keyword: 51043 = Clarke
Place_Keyword: 51045 = Craig
Place_Keyword: 51047 = Culpeper
Place_Keyword: 51049 = Cumberland
Place_Keyword: 51053 = Dinwiddie
Place_Keyword: 51057 = Essex
Place_Keyword: 51059 = Fairfax
Place_Keyword: 51061 = Fauquier
Place_Keyword: 51065 = Fluvanna
Place_Keyword: 51069 = Frederick
Place_Keyword: 51071 = Giles
Place_Keyword: 51073 = Gloucester
Place_Keyword: 51075 = Goochland
Place_Keyword: 51079 = Greene
Place_Keyword: 51085 = Hanover
Place_Keyword: 51087 = Henrico
Place_Keyword: 51091 = Highland
Place_Keyword: 51093 = Isle of Wight
Place_Keyword: 51095 = James City
Place_Keyword: 51099 = King George
Place_Keyword: 51101 = King William
Place_Keyword: 51097 = King and Queen
Place_Keyword: 51103 = Lancaster
Place_Keyword: 51107 = Loudoun
Place_Keyword: 51109 = Louisa
Place_Keyword: 51113 = Madison
Place_Keyword: 51115 = Mathews
Place_Keyword: 51119 = Middlesex
Place_Keyword: 51121 = Montgomery
Place_Keyword: 51125 = Nelson
Place_Keyword: 51127 = New Kent
Place_Keyword: 51131 = Northampton
Place_Keyword: 51133 = Northumberland
Place_Keyword: 51135 = Nottoway
Place_Keyword: 51137 = Orange
Place_Keyword: 51139 = Page
Place_Keyword: 51145 = Powhatan
Place_Keyword: 51147 = Prince Edward
Place_Keyword: 51149 = Prince George
Place_Keyword: 51153 = Prince William
Place_Keyword: 51157 = Rappahannock
Place_Keyword: 51159 = Richmond
Place_Keyword: 51161 = Roanoke
Place_Keyword: 51163 = Rockbridge
Place_Keyword: 51165 = Rockingham
Place_Keyword: 51171 = Shenandoah
Place_Keyword: 51177 = Spotsylvania
Place_Keyword: 51179 = Stafford
Place_Keyword: 51181 = Surry
Place_Keyword: 51187 = Warren
Place_Keyword: 51193 = Westmoreland
Place_Keyword: 51199 = York

Access_Constraints: None

Use_Constraints:

Although all data released in this report have been used by the USGS, no warranty, expressed or implied, is made by the USGS as to the accuracy of the data and related materials and (or) the functioning of the software. Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the U.S. Government

Point_of_Contact:

Contact_Information:

Contact_Person_Primary:

Contact_Person: J. Wright Horton, Jr.
Contact_Organization: U.S. Geological Survey

Contact_Address:

Address_Type: Mailing address
Address: National Center, MS926A
City: Reston
State_or_Province: Virginia
Postal_Code: 20192
Country: USA

Contact_Voice_Telephone: 703-648-6933

Contact_Facsimile_Telephone: 703-648-6953

Contact_Electronic_Mail_Address: whorton@usgs.gov

Browse_Graphic:

Browse_Graphic_File_Name: <http://pubs.usgs.gov/openfile/of01-187/01187p1p.gif>
Browse_Graphic_File_Description:: Reduced-size image showing the general layout of map sheet. 864x597 pixels, 24-bit color.
Browse_Graphic_File_Type: GIF

Data_Quality_Information:

Logical_Consistency_Report: Polygon and chain-node topology present

Completeness_Report:

All lithogeochemical polygons in this report were derived from digitized Maryland and Virginia state geologic maps. Digital compilation of the Virginia geologic data was completed in 1998. Subsequent to the beginning of this study, the Virginia Division of Mineral Resources completed a revision of the data set. However, the Virginia geologic data used to prepare this report was taken from the earlier data set.

Lineage:

Source_Information:

Source_Citation:

Citation_Information:

Originator: Cleaves and others
Publication_Date: 1968
Title: Geologic Map of Maryland
Online_Linkage: <http://www.mgs.md.gov/index.html>

Source_Scale_Denominator: 250000

Type_of_Source_Media: Paper map

Source_Time_Period_of_Content:

Time_Period_Information:

Single_Date/Time:

Calendar_Date: 1968

Source_Currentness_Reference: Publication date

Source_Citation_Abbreviation: Cleaves (1968)

Source_Contribution:

Provided geology for Maryland. Used to produce digital polygon data of Maryland geology.

Process_Step:

Process_Description:

Geology was mapped by Cleaves and others and published in 1968. The geologic map was scanned using an Anatech Eagle 4080T scanner. The raster files were then converted to Abicas map image format and the geologic information was digitized as 30' x 60' tiles. The Abicas files were converted to Arc/Info format. Arc/Info versions 7.2.1 and 8.0.2 were used to assemble the individual tiles into a statewide geologic coverage containing geologic and lithogeochemical attributes. The statewide coverage was clipped to the Chesapeake Bay Watershed boundary. Digital compilation was completed in 2001. The Arc/Info coverage was converted to Abicas, Arc/Info export-interchange, and ArcView shapefile formats.

Process_Date: 2001

Process_Contact:

Contact_Information:

Contact_Organization_Primary:

Contact_Organization: Maryland Geological Survey

Contact_Address:

Address_Type: mailing and physical address
Address: 2300 St. Paul Street
City: Baltimore
State_or_Province: MD
Postal_Code: 21218

Contact_Voice_Telephone: (410) 554-5500

Source_Information:

Source_Citation:

Citation_Information:

Originator: Virginia Division of Mineral Resources
Publication_Date: 1993
Title: Geologic Map of Virginia
Other_Citation_Details:
Online_Linkage: <http://www.mme.state.va.us/DMR/home.dmr.html>

Source_Scale_Denominator: 500000

Type_of_Source_Media: Paper map

Source_Time_Period_of_Content:

Time_Period_Information:

Single_Date/Time:

Calendar_Date: 1993

Source_Currentness_Reference: Publication date

Source_Citation_Abbreviation: Virginia Division of Mineral Resources (1993)

Source_Contribution:

Provided geology for Virginia. Used to produce digital polygon data of Virginia geology.

Process_Step:

Process_Description:

Geology was mapped by the Virginia Division of Mineral Resources and published in 1993. The geologic map was scanned using an Anatech Eagle 4080T scanner. The raster files were then converted to Abicas map image format and the geologic information was digitized as 30' x 60' tiles. The Abicas files were converted to Arc/Info format. Arc/Info versions 7.2.1 and 8.0.2 were used to assemble the individual tiles into a statewide geologic coverage containing geologic and lithogeochemical attributes. The statewide coverage was clipped to the Chesapeake Bay Watershed boundary. Digital compilation was completed in 2001. The Arc/Info coverage was converted to Abicas, Arc/Info export-interchange, and ArcView shapefile formats.

Process_Date: 2001

Process_Contact:

Contact_Information:

Contact_Organization_Primary:

Contact_Organization:: Virginia Department of Mines, Minerals and Energy; Division of Mineral Resources

Contact_Address:

Address_Type: mailing address
Address: P.O. Box 3667
City: Charlottesville
State_or_Province: VA
Postal_Code: 22903

Contact_Voice_Telephone: (804) 951-6340

Source_Information:

Source_Citation:

Citation_Information:

Originator: U.S. Department of Agriculture, Soil Conservation Service
Publication_Date: 1994
Title: State Soil Geographic (STATSGO) data base for Maryland

Source_Scale_Denominator: 250000

Type_of_Source_Media: Digital general soil association map

Source_Time_Period_of_Content:

Time_Period_Information:

Single_Date/Time:

Calendar_Date: 1994

Source_Currentness_Reference: Publication date

Source_Citation_Abbreviation: STATSGO Maryland (1994)

Source_Contribution:

Provided soil data for Maryland. Used to produce digital polygon data of Maryland carbon-rich soils.

Process_Step:

Process_Description:: STATSGO data base was compiled by the U.S. Department of Agriculture, Soil Conservation Service and published in 1994. Arc/Info version 7.1.2 was used to create an INFO table named OC13MAPUNIT from the data base. The table OC13MAPUNIT contains, for each soil map unit (MUID) in Maryland, a value of the soil organic carbon in the total soil profile. This value is stored in an item named OC.M.G.M2 (for organic carbon, mapunit, grams, meters squared). The Arc/Info command JOINITEM was used to add the item OC.M.G.M2 to the .pat table for the CARBON coverage. The Arc/Info coverage was converted to Abicas, Arc/Info export-interchange, and ArcView shapefile formats.
Process_Date: 1998

Source_Information:

Source_Citation:

Citation_Information:

Originator: U.S. Department of Agriculture, Soil Conservation Service
Publication_Date: 1994
Title: State Soil Geographic (STATSGO) data base for Virginia

Source_Scale_Denominator: 250000

Type_of_Source_Media: Digital general soil association map

Source_Time_Period_of_Content:

Time_Period_Information:

Single_Date/Time:

Calendar_Date: 1994

Source_Currentness_Reference: Publication date

Source_Citation_Abbreviation: STATSGO Virginia (1994)

Source_Contribution:

Provided soil data for Virginia. Used to produce digital polygon data of Virginia carbon-rich soils.

Process_Step:

Process_Description:: STATSGO data base was compiled by the U.S. Department of Agriculture, Soil Conservation Service and published in 1994. Arc/Info version 7.1.2 was used to create an INFO table named OC13MAPUNIT from the data base. The table OC13MAPUNIT contains, for each soil map unit (MUID) in Virginia, a value of the soil organic carbon in the total soil profile. This value is stored in an item named OC.M.G.M2 (for organic carbon, mapunit, grams, meters squared). The Arc/Info command JOINITEM was used to add the item OC.M.G.M2 to the .pat table for the CARBON coverage. The Arc/Info coverage was converted to Abicas, Arc/Info export-interchange, and ArcView shapefile formats.
Process_Date: 1998

Source_Information:

Source_Citation:

Citation_Information:

Originator: Lipin, B.

Originator: Mason, Jr., George T.

Originator: McFaul, E.J.

Publication_Date: 1998

Title: Mineral Resources Data System (MRDS) Release-2

Series_Information:

Series_Name: U.S. Geological Survey Digital Data Series
Issue_Identification: DDS-20 Release-2

Publication_Information:

Publication_Place: Reston, VA
Publisher: U.S. Geological Survey

Type_of_Source_Media: Digital records of metallic and nonmetallic mineral resources

Source_Time_Period_of_Content:

Time_Period_Information:

Range_of_Dates/Times:

Beginning_Date: 1972
Ending_Date: 1998

Source_Currentness_Reference: Period in which information was added to the MRDS

Source_Citation_Abbreviation: MRDS (1998)

Source_Contribution:

Provided sulfide data for Maryland and Virginia. Used to produce digital point data of Maryland and Virginia sulfide deposits.

Process_Step:

Process_Description:: MRDS data base was compiled by the U.S. Geological Survey between 1972 and 1998 and published in 1998. Arc/Info version 7.1.2 was used to create Maryland and Virginia statewide point coverages from the MRDS data base. The statewide coverages were clipped to the Chesapeake Bay Watershed boundary to create the SULFIDE coverages. The Arc/Info coverages were converted to Abicas, Arc/Info export-interchange, and ArcView shapefile formats.
Process_Date: 1998

Source_Information:

Source_Citation:

Citation_Information:

Originator: Chesapeake Bay Program
Publication_Date: 1998
Title: Mid-Atlantic States County Boundaries

Source_Scale_Denominator: 100000

Type_of_Source_Media: Arc/Info coverage

Source_Time_Period_of_Content:

Time_Period_Information:

Single_Date/Time:

Calendar_Date: 1998

Source_Currentness_Reference: Publication date

Source_Citation_Abbreviation: CBP

Source_Contribution:

Provided base map data. Used to produce polygon coverages of county boundaries for Maryland and Virginia

Process_Step:

Process_Description:: Digital Line Graph (DLG) files of county boundaries at 1:100,000-scale were created by the U.S. Geological Survey as 15' x 15' tiles. The Chesapeake Bay Program used the USGS DLG files to create a Mid-Atlantic States County Boundaries data layer in Arc/Info coverage format. The Mid-Atlantic regional coverage was obtained from <http://www.chesapeakebay.net/data/index.htm> and clipped to the Chesapeake Bay Watershed boundary to create the POLBND coverages for Maryland and Virginia. The Arc/Info coverages were converted to Abicas, Arc/Info export-interchange, and ArcView shapefile formats.
Process_Date: 1998

Spatial_Data_Organization_Information:

Direct_Spatial_Reference_Method: Vector

Point_and_Vector_Object_Information:

SDTS_Terms_Description:

SDTS_Point_and_Vector_Object_Type: Entity point

SDTS_Terms_Description:

SDTS_Point_and_Vector_Object_Type: Complete chain

SDTS_Terms_Description:

SDTS_Point_and_Vector_Object_Type: GT-polygon composed of chains

Spatial_Reference_Information:

Horizontal_Coordinate_System_Definition:

Geographic:

Latitude_Resolution: 0.001
Longitude_Resolution: 0.001
Geographic_Coordinate_Units: Decimal degrees

Geodetic_Model:

Horizontal_Datum_Name: North American Datum of 1983
Ellipsoid_Name: Geodetic Reference System 80
Semi-major_Axis: 6378137
Denominator_of_Flattening_Ratio: 298.257

Entity_and_Attribute_Information:

Overview_Description:

Entity_and_Attribute_Overview:

The following is a brief description of the data layers, tables, and their associated attributes that are used in this report.

GEOLOGIC DATA:
CARBON - polygon data layer of carbon-rich soils:
  MUID - map unit identifier derived from STATSGO data base
  OC.M.G.M2 - value for soil organic carbon in square meters

GEOLOGY - polygon data layer of the contacts of geologic map units:
  GEOL_CODE - geologic map unit code

LITHOGEO - polygon data layer of the contacts of lithogeochemical map units:
  LITH_CODE - lithogeochemical map unit code

SULFIDE - point data layer of sulfide deposits:
  STATE_CODE - state code
  SITE - deposit name
  LAT - latitude
  LONG - longitude
  COMMOD - commodities present
  MAJOR - major products
  MINOR - minor products
  TRACE - trace or occurrence commodity
  DEP_TYPE - deposit types
  MODEL - USGS model name
  DEP_SIZE - size of deposit

GEOLLITH - data table that relates GEOL_CODE to LITH_CODE:
  GEOL_CODE - geologic map unit code
  LITH_CODE - lithogeochemical map unit code

LITHTBL - data table that relates LITH_CODE to ROCK_TYPE_GROUP, SUB_GROUP, MAP_UNIT, ROCK_TYPE_CLASS, MINERALOGY, and WATER_CHEMISTRY:
  LITH_CODE - lithogeochemical map unit code
  ROCK_TYPE_GROUP - rock type; e.g., sedimentary rocks and their metamorphic equivalents
  SUB_GROUP - rock type sub group; e.g., carbonate-rich rock
  MAP_UNIT - map unit; e.g., limestone
  ROCK_TYPE_CLASS -  rock class; e.g., carbonate-bearing rock
  MINERALOGY - mineralogical properties; e.g., quartz-, and feldspar-rich rock
  WATER_CHEMISTRY - suggested water chemistry; e.g., low acid-neutralizing capacity

BASE DATA:
POLBND - polygon data layer of county boundaries:
  STATECTY - map unit identifier derived from the Chesapeake Bay Program data
  ST - state identifier
  CNTYNAME - county name
  POLYTYPE - feature identifier derived from the Chesapeake Bay Program data

Entity_and_Attribute_Detail_Citation: <http://pubs.usgs.gov/openfile/of01-187/of01187.pdf>

Distribution_Information:

Distributor:

Contact_Information:

Contact_Organization_Primary:

Contact_Organization: U.S. Geological Survey

Contact_Position: J. Wright Horton, Jr.

Contact_Address:

Address_Type: Mailing address
Address: National Center, MS926A
City: Reston
State_or_Province: Virginia
Postal_Code: 20192
Country: USA

Contact_Voice_Telephone: 703-648-6933

Contact_Facsimile_Telephone: 703-648-6953

Contact_Electronic_Mail_Address: whorton@usgs.gov

Hours_of_Service: Monday - Friday 9:00 - 5:00 EST

Resource_Description: USGS Open-File Report 01-187

Distribution_Liability:

These data were prepared by an agency of the United States Government. Neither the United States Government nor any agency thereof, nor any of their employees, make any warranty, expressed or implied, or assume any legal liability or responsibility for the accuracy, completeness, or usefulness of any information, apparatus, product or process disclosed in this report, and represents that its use would not infringe privately owned rights. The act of distribution shall not constitute any such warranty, and no responsibility is assumed by the USGS in the use of this data or related materials. Reference therein to any specific commercial product, process, or related service by trade name, trademark, manufacturer, or otherwise does not necessarily constitute or imply its endorsement, recommendation, or favoring by the United States Government or any agency thereof.

Standard_Order_Process:

Digital_Form:

Digital_Transfer_Information:

Format_Name: Arc/Info export-interchange
Format_Version_Number: 8.0.2
Format_Information_Content:: Geologic and lithogeochemical contacts, carbon-rich soils, sulfide deposits, and county boundaries
File_Decompression_Technique: WinZip, gzip and tar
Transfer_Size: 7.0 megabytes

Digital_Transfer_Option: