Grand Canyon May Be 70 Million Years Old (2 of 3) (IMAGE)

American Association for the Advancement of Science (AAAS)

Grand Canyon May Be 70 Million Years Old (2 of 3)

Caption

View of the western Grand Canyon and the Colorado River from the canyon bottom. 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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