JIM WEST / SCIENCE PHOTO LIBRARY JIM WEST / SCIENCE PHOTO LIBRARY
Rock art. These rock art images (petroglyphs), etched into basalt boulders, were made by the Hohokam, who may be the ancestors of the modern Pima and Tohono O'odham peoples in southern Arizona. Photographed at the Painted Rock Petroglyph Site near Gila Bend, Arizona, USA.
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