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

Summary

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 [...]

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Reduced-size image showing the general layout of map sheet. 864x597 pixels, 24-bit color.
Reduced-size image showing the general layout of map sheet. 864x597 pixels, 24-bit color.

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Last harvested on Mon Sep 19 11:19:55 MDT 2011 from: http://geo-nsdi.er.usgs.gov/sitemap.xml using the SiteMap

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URL Web http://geo-nsdi.er.usgs.gov/metadata/open-file/01-187/metadata.xml

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