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

Karl E. Karlstrom; John P. Lee; Shari A. Kelley; Ryan S. Crow; Richard A. Young; Ivo Lucchitta; L. Sue Beard; Rebecca Dorsey; Jason Ricketts; William R. Dickinson; Laura Crossey

doi:10.1126/science.1233982

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

Science

By: Karl E. Karlstrom, John P. Lee, Shari A. Kelley, Ryan S. Crow, Richard A. Young, Ivo Lucchitta, L. Sue Beard, Rebecca Dorsey, Jason Ricketts, William R. Dickinson, and Laura Crossey

https://doi.org/10.1126/science.1233982

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Abstract

Flowers and Farley (Reports, 21 December 2012, p. 1616; published online 29 November 2012) propose that the Grand Canyon is 70 million years old. Starkly contrasting models for the age of the Grand Canyon—70 versus 6 million years—can be reconciled by a shallow paleocanyon that was carved in the eastern Grand Canyon 25 to 15 million years ago (Ma), negating the proposed 70 Ma and 55 Ma paleocanyons. Cooling models and geologic data are most consistent with a 5 to 6 Ma age for western Grand Canyon and Marble Canyon.

Additional publication details
Publication type	Article
Publication Subtype	Journal Article
Title	Comment on “Apatite 4He/3He and (U-Th)/He Evidence for an Ancient Grand Canyon”
Series title	Science
DOI	10.1126/science.1233982
Volume	340
Issue	6129
Year Published	2013
Language	English
Publisher	Science
Contributing office(s)	Central Mineral and Environmental Resources Science Center
Description	Article 143; 3 p.
First page	143
Last page	143
Google Analytic Metrics	Metrics page