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Caption: View of the western Grand Canyon and the Colorado River from the canyon bottom. New data suggests most of this portion of the canyon was carved by 70 Ma, more than 60 Ma earlier than generally believed. This image relates to a paper that appeared in the Nov. 29, 2012, issue of Science Express, published by AAAS. The paper, by Rebecca Flowers at University of Colorado at Boulder in Boulder, Colo., and colleagues was titled, "Apatite 4He/3He and (U-Th)/He Evidence for an Ancient Grand Canyon."
Credit: Image courtesy of Rebecca Flowers
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