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Maps Produced By The U.S. Government

The United States government is a significant producer of maps. This guide covers the major types of maps produced and how best to access them in print or online.

What are geologic maps?

Geologic or geological maps show geologic features such as rock types and faults. These maps usually overlay a topographic base map, but other base maps can be used. The geology of the map area is depicted using colors, lines, and symbols. Geologic mapping can be used to assess natural resources and geologic hazards, which can be of importance to a variety of researchers.

Geologic Maps Online