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

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

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...

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Veröffentlicht in:Science (American Association for the Advancement of Science) 2008-09, Vol.321 (5896), p.1634-1634
Hauptverfasser: Pearthree, Philip A, Spencer, Jon E, Faulds, James E, House, P Kyle
Format: Artikel
Sprache:eng
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Zusammenfassung: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.
ISSN:0036-8075
1095-9203
DOI:10.1126/science.1158862