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

Article

  The North American Tapestry of Time and Terrain

Introduction
The Two Maps
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Features
Legend and Rock Ages
Rock Types
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  Features
 

Grand Canyon

 
Geologic Map around the Grand Canyon area

 

 

Satellite image of the Grand Canyon, Arizona.
Image available from the NASA Space Shuttle Earth Observations Photography database Photo #STS060-083-005

The winding course of the Colorado River through northern Arizona's mile-deep Grand Canyon is well marked on the map by a vivid contrast in pattern and color. A narrow ribbon of red is occasionally visible; it differentiates the Precambrian granites and tilted metamorphic rocks along the riverbanks from the younger, overlying Paleozoic sedimentary rocks in the canyon walls and at the rim (in blue). Abundant water from melting Pleistocene glaciers is probably responsible for the most recent episode of erosion that has deepened the canyon.