Petroglyphs in Peril First off, Nine Mile Canyon in eastern Utah is misnamed. It’s actually about 40 miles long. But it’s accurate to say that the place holds the largest collection of rock art in the world. Members of the Ute and Fremont tribes carved into the walls some 10,000 petroglyph images of people and animals, many more than 1,000 years old. Now, the art is in danger. A dirt road goes through the canyon, carrying hundreds of cars and trucks every day. Workers deposit magnesium ch


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