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Geologic Map
Shaded Relief
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Generalized Geologic Map of the Conterminous United States
North America Shaded Relief


  The North American Tapestry of Time and Terrain

The Two Maps
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Legend and Rock Ages
Rock Types
Political Boundaries


Black Hills


Close-up of
 black hillsRising conspicuously from the Great Plains in western South Dakota, the Black Hills are visible on the map by the outcrop of Precambrian (red-orange on the map) and Paleozoic rock (blue). The upturned and eroded Paleozoic and Mesozoic strata of this structural dome surround the ancient granite on which the four faces of the Mt. Rushmore presidential monument were carved. Geologically, the Black Hills represent the easternmost outpost of the Rocky Mountains.