JOHN WESLEY POWELL

Major John Wesley Powell is credited as the man who led the first U.S. Government Expedition down the Green and Colorado rivers, through the Grand Canyon in 1869. He would later retrace his first trip and finish the expedition in 1871. See various reference photos from his trips down the rivers, as well as numerous related pieces commemorating his history voyages here.

GEOLOGY

The Colorado Plateau is composed of Neoproterozoic, Paleozoic, and Mesozoic sedimentary rocks. Sandstones, shales, and limestones are common, as are...
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GLEN CANYON DAM HISTORY

The Glen Canyon Dam was constructed from 1956 to 1966 by the United States Bureau of Reclamation. The 710-foot-high arch-gravity...
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