The USGS National Geologic Map Database.
Searchable catalog of paper and digital geologic maps, mostly for the U.S.
Maps of the states created by the United States Geologic Survey.
High resolution, detailed geologic map of Texas from the Texas Water Development Board.
Texas Bureau of Economic Geology maps from the University of Texas Walter Geologic Library.
Information about Geologic Maps from the American Association of Petroleum Geologists.
An interactive geological map of the British Isles.
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