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

Online link https://geo-nsdi.er.usgs.gov/metadata/open-file/01-187/metadata.faq.html
Description 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, mineral
Originators Peper, John D.; McCartan, Lucy B.; Horton, J. Wright, Jr.; and Reddy, James E.
Publication U.S. Geological Survey Open-File Report 01-187

Related topics

States or counties

Overview of attributes

>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

http://pubs.usgs.gov/of/2001/of01-187/of01187.pdf