National geologic map database

Searchable catalog providing access to maps and other spatially referenced data for geology, geophysics, marine geology, earth resources, hazards, geochemistry, geochronology, and paleontology. Includes links to other sources of topographic and related maps, other earth science databases, and additional Web resources related to geology.

"Your Geoscience resource for maps and related data about: geology, hazards, earth resources, geophysics, geochemistry, geochronology, paleontology, and marine geology. ".