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
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.
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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
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.
|Data format:||Geologic and lithogeochemical contacts, carbon-rich soils, sulfide deposits, and county boundaries in format ARCE (version 8.0.2) Size: 7.0|