Combined geologic map data for the conterminous US derived from the USGS state geologic map compilation
Peter N. Schweitzer
The State Geologic Map Compilation was an effort by USGS to assemble state geologic maps and arrange their attribute data in a consistent database structure with, as much as practical, consistent category terms for the most critical attributes. Those data are provided on the web in separate data packages for each state, as they were published by USGS. This data set rearranges those data with a small subset of descriptive attributes, one of which is a hypertext link to an online description of the geologic map unit.