Version 1.0. - [Reston, Va.] : U.S. Dept. of the Interior, U.S. Geological Survey, 2001.
Map — 1 CD-ROM : col. map ; 4 3/4 in.
Contains a combination of explanatory text, geographic information system (GIS) data layers, metadata which describe the GIS data, graphic files for plotting the paper map, and application software for viewing the data. Shows the distribution of rock types as lithogeochemical units in the Virginia and Maryland portions of the Chesapeake Bay watershed.