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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

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Legend and Rock Ages
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Valles Caldera

  Close-up of
 valles caldera region
Satellite view of valles caldera

Thousands of volcanoes erupted throughout the western U.S. in the last 60 million years, but most individual craters are too small to show up clearly in the Tapestry. Among the larger visible volcanoes is Valles Caldera (a beige patch in the northwest Rio Grande Rift).