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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



  Close-up of
 the Florida peninsula Florida is one of many add-on appendages to eastern North America. Evidence of its overseas origin lies hidden beneath a cover of Tertiary and Quaternary sediments. The underlying rocks, hidden from view on this map but known from materials (core samples) brought to the surface from drill holes, are an upper Precambrian to lower Paleozoic piece of western Africa. This chunk of Africa was added to the continent during the formation of Pangaea and remained attached to North America when Pangaea broke apart and created the Atlantic Ocean during the Jurassic.