 Date: 2012-01-14 06:42:36Colorado Plateau Grand Canyon Colorado River Glen Canyon National Recreation Area Prospect Dam Uinkaret volcanic field Toroweap Overlook Toroweap Fault Glen Canyon Dam Glen Canyon Geology Geology of the Grand Canyon area | |  springPhoto courtesy of Special Collections Department, J. Willard Marriott Library, University of Utah. the journal of Grand Canyon River Guides, Inc
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