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1. Comment on 'Age and Evolution of the Grand Canyon Revealed by U-Pb Dating of Water Table–Type Speleothems'

Author

P. Kyle House, Philip A. Pearthree, James E. Faulds, and Jon E. Spencer

Subjects
Canyon, geography, Multidisciplinary, Oceanography, geography.geographical_feature_category, Water table, Extensional tectonics, Archaeology, Geology
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.

Published
2008

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