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Columnar basalt at the mouth of Grand Wash in Arizona
Grand Canyon, looking below the mouth of the Diamond River in Arizona
Cathedral Mesa on the Colorado River in Arizona
Light and shadow in the Black Canyon of the Colorado River in Nevada, viewed from Mirror Bar
Black Canyon of the Colorado River, looking above from Camp 8 in Nevada
Entrance to the Black Canyon of the Colorado River in Nevada
Wall in the Grand Canyon
Saguaro cactus in Arizona
Rock carved by drifting sand below Fortification Rock in Arizona
Eroded strata near Cottonwood Springs, Nevada
Iceberg Canyon on the Colorado River in Nevada
Photos by Timothy H. O'Sullivan (1840-1882), from U.S. Geographical Surveys West of the One Hundredth Meridian under Lieutenant George M. Wheeler, 1871 Expedition (U. S. Geological Survey Photographic Library)
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