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Geologic Map
Shaded Relief
Map Layer
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


Finger Lakes

  Close-up of
 New York's Finger Lakes
The Finger Lakes in west-central New York state were formed when the last Pleistocene ice cap melted back and flooded valleys previously deepened by the scouring of glacial ice. A thick veneer of glacial debris, not shown here, overlies the lower Paleozoic bedrock indicated on the map. The native American Iroquois believed that the fan-shaped array of lakes are marks from the hand of the Great Spirit.