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.
In the catalog: start with a general keyword search using the terms geology [place name] maps. For further refinement use the Advanced 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.
National Geologic Map Database - Discover and access geologic maps, stratigraphy, and GIS data for the United States.