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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


Exotic Terranes

  Close-up of
 New England's Exotic terranes
Complex north-south patterns in the six New England states tell a convoluted geologic story. This northern stretch of the Appalachians consists of several terranes, fault-bounded slices of the crust that have a tectonic history distinct from adjacent rocks. The terranes, which include rocks similar to those in the British Isles and North Africa, originated elsewhere but were joined (accreted) to eastern North America in the Paleozoic during the formation of Pangaea. A Paleozoic fault zone comparable to the San Andreas fault, an intrusion of Mesozoic igneous masses, and the opening of the Atlantic Ocean have further complicated this New England portrait.