Geology of the conterminous United States

Online link https://mrdata.usgs.gov/geology/us/
Description A digital version of the Geologic Map of the United States, originally published at a scale of 1:2,500,000 (King and Beikman, 1974b). It excludes Alaska and Hawaii.
Originators Schruben, Paul G.; Arndt, Raymond E.; and Bawiec, Walter J.
Publication U.S. Geological Survey Digital Data Series 11
Metadata Questions and answers

States or counties

Reduced-size image showing only geologic age with simplified polygons
Reduced-size image showing only geologic age with simplified polygons