Where to Get Geologic Maps USGS Maps Geologic Mapping of Washington Geologic maps show the types and ages of rocks that occur at or near the Earth s surface and the locations of faults and folds.
Geologic maps are the most fundamental and important database for the earth sciences.
Most of the maps have been released as Division open-file reports, and the remainder are in various stages of completion. Some have been released in recent years by the U.S. Geological Survey. These are printed in full color. The northwest quadrant, which will complete the set, will be printed in 2001. The Division has received requests for geologic GIS data from businesses and federal, state, and local agencies.