12-001f13.jpg
Description:
The North America Tapestry of Time and Terrain. This map is a portrait of the land surface of North America and the ages of its underlying rock formations. This digital tapestry outlines the geologic story of continental collision and break-up, mountain-building, river erosion and deposition, ice-cap glaciation, volcanism, and other events and processes that have shaped the region over the last 2.6 billion years. (Image and text courtesy of the U.S. Geological Survey.)
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12-001f13.jpg
Alt text:
A map of North America with colors that represent the ages of the underlying rocks.
Caption:
The North America Tapestry of Time and Terrain. This map is a portrait of the land surface of North America and the ages of its underlying rock formations. This digital tapestry outlines the geologic story of continental collision and break-up, mountain-building, river erosion and deposition, ice-cap glaciation, volcanism, and other events and processes that have shaped the region over the last 2.6 billion years. (Image and text courtesy of the U.S. Geological Survey.)
Credit:
Image and text courtesy of the U.S. Geological Survey.
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