U.S. Geological Survey Photographic Library

ID. Wheeler, 72

Columnar basalt at the mouth of Grand Wash in Arizona. Photo by T.H. O'Sullivan.U.S. Geographical Surveys West of the One Hundredth Meridian (Wheeler Survey, 1871 Expedition).

Columnar basalt at the mouth of Grand Wash 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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