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Geologic maps show the distribution of Earth's materials at the planet's surface. The Earth Sciences & Map Library has a large collection of geologic maps covering various parts of the world. Geologic maps have been acquired from the U.S. Geological Survey, various state geological surveys, and foreign agencies.
Finding Geologic Maps in the Library
In the catalog:start with a general keyword search using the terms geology [place name] maps. For further refinement use the Advanced Keyword Search to search for the subject keywords [geology place name maps] (e.g., geology tokyo japan maps). You can find other geological keywords in the list of common subject keywords for maps.
Geologic maps of California with strong emphasis on basic bedrock geology. Based on reconnaissance geologic field mapping, including the identification and interpretation of surface conditions, and data compilation by T.W. Dibblee, Jr.
Use the index from the AAPG store page to find the sheet number for your quadrangle of interest: https://store.aapg.org/ATSResources/product-splash/dibblee.aspx