U.S. Geological Survey Photographic Library

ID. Wheeler 1871, 14

Rock carved by drifting sand below Fortification Rock in Arizona. Photo by T.H. O'Sullivan.U.S. Geographical Surveys West of the One Hundredth Meridian (Wheeler Survey, 1871 Expedition).

Rock carved by drifting sand below Fortification Rock in Arizona. Photo by T.H. O'Sullivan.U.S. Geographical Surveys West of the One Hundredth Meridian (Wheeler Survey, 1871 Expedition).

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