20250507 07424900 1.0 TRUE USGS_OF_81_1048_1 Preliminary geologic map of Cenozoic deposits of Copperopolis quadrangle, California Bartow, J.A., Marchand, D.E., and Shipley, Susan : U.S. Geological Survey OF-81-1048, scale 1:62,500. http://ngmdb.usgs.gov/Prodesc/proddesc_11869.htm