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Comment on “Apatite 4He/3He and (U-Th)/He Evidence for an Ancient Grand Canyon”

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Science  12 Apr 2013:
Vol. 340, Issue 6129, pp. 143
DOI: 10.1126/science.1234567

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Flowers and Farley (Reports, 21 December 2012, p. 1616; published online 29 November 2012) use thermochronometry to propose that the western paleo–Grand Canyon was nearly as deep 70 million years ago (Ma) as today. However, lithologies, facies relations, geomorphology, and paleotopography of Miocene interior-basin deposits near the mouth of the Grand Canyon show that no paleocanyon existed in that area during filling of the basin, ~17 to ~5 Ma.

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