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Geologic Map
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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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Crater Lake


Close-up of
 crater lake

About 7,700 years ago, during the Holocene, the 3,600 m (12,000 ft) high Mount Mazama, located in present-day southwest Oregon, erupted. The volcano released a huge cloud of ash that spread as far as Canada and Nebraska. The volcano collapsed into itself, forming a caldera that has since filled with water. This is known now as Crater Lake, visible as a small black oval on the Tapestry.


Aerial view of Crater Lake, California.

This aerial view of Crater Lake was taken by Timothy Lesle in November 2003. The smoke is from nearby forest fires.

3D image of the floor of Crater Lake, California.

US Geological Survey geologists have mapped the floor of Crater Lake. The image above is a perspective view of the lake-floor geology. To learn more about this project and see other images, go to the Multibeam Sonar Survey of Crater Lake Web site. To learn more about underwater mapping, look at the Pacific Seafloor Mapping Project site.