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Geology 101 Maps

Washington Geologic Maps

US Maps

USGS National Geologic Map Database -- Under GEOLOGY choose bedrock and surficial; under Scale Range, do 1:24,000 to 1:100,000. Some maps are online; for paper maps, search the Griffin catalog to see if Owen Library has them.
Oregon Department of Geology and Mineral Industries
Idaho Geological Survey
Digital Atlas of Idaho
Montana’s State Geologic Mapping Program
California
- The California Geotour
- California Department of Conservation
Nevada Bureau of Mines and Geology
Utah Geological Survey

Tips and Tricks

Use your location map, Google maps, National Park map, etc. to help you find the correct geologic map and locate your area on it.
You can try searching by the name of the USGS topographic quadrangle for your area.
It may also help to know the name of the county.

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