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U.S. Rock Art in the Twenty-first Century: Problems and Prospects

Bighorn sheep petroglyphs from the Coso Range in eastern California. The Coso Range contains roughly one hundred thousand petroglyphs made between ten thousand years ago and the early twentieth century, over half of which depict bighorn sheep—a special spirit helper of rain shamans. These examples are thought to be less than two thousand years old. Photo: David S. Whitley.