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Comment
. 2008 Sep 19;321(5896):1634.
doi: 10.1126/science.1158862.

Comment on "Age and evolution of the Grand Canyon revealed by U-Pb dating of water table-type speleothems"

Philip A Pearthree  1 , Jon E Spencer, James E Faulds, P Kyle House
Affiliations
Comment

Comment on "Age and evolution of the Grand Canyon revealed by U-Pb dating of water table-type speleothems"

Philip A Pearthree et al. Science. .

Abstract

Polyak et al. (Reports, 7 March 2008, p. 1377) reported that development of the western Grand Canyon began about 17 million years ago. However, their conclusion is based on an inappropriate conflation of Plio-Quaternary incision rates and longer-term rates derived from sites outside the Grand Canyon. Water-table declines at these sites were more likely related to local base-level changes and Miocene regional extensional tectonics.

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