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north face softshell esult is that artists don't talk about science much, and scientists don't talk about art much," Whitley said. "I'm very happy they did this."The seeds of the study were planted about eight years ago when a man brought a piece of sandstone from the area to Pederson. The retired scientist and rock-art enthusiast wanted to find out if it were possible to assess the date of a drawing by looking at the composition or color of the rocks.The question piqued the interest of Pederson, who specializes in the history of rivers and has written articles on the age of the Grand Canyon. After going to see the Horseshoe Canyon figures up close, Pederson was
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