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The National Geologic Map Database
A Distributed Archive of Standardized Geoscience Information for the Nation
ExploreGeologic Maps
Since the 1800s, the USGS and its partners, the State Geological Surveys, have been producing high quality, standardized geologic maps of the Nation. Check out the National Geologic Map Database (NGMDB), which is the National archive of these maps and related geoscience reports.
Date published: March 7, 2016
Geologic Map Data
Digital geologic maps of the U.S. States with consistent lithology, age, GIS database structure, and format.
Attribution: Energy and Minerals, Mineral Resources Program