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An Analysis of the Chronology of Late Pleistocene Mammalian Extinctions in North America

Published online by Cambridge University Press:  20 January 2017

Donald K. Grayson
Donald K. Grayson*
Affiliation:
Department of Anthropology, and Burke Memorial Museum, University of Washington, Seattle, Washington 98195
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Abstract

Some 35 genera of mammals became extinct in North America as the Pleistocene came to an end. Current attempts to explain those extinctions generally assume that all of the losses took place between 12,000 and 10,000 yr B.P., even though 13 of the 35 genera lack radiocarbon dates of reasonable validity that would place them in this 2000-yr period. Analyses of the structure of the radiocarbon chronology available for the extinct taxa suggest that some may lack terminal Wisconsin dates simply because they are so poorly represented in the paleontological record. These analyses also suggest, however, that the population numbers of many genera that became extinct toward the end of the Pleistocene may have significantly dwindled by 12,000 yr B.P., and that many of the genera that have yet to be dated to terminal Wisconsin times may not have survived beyond 12,000 yr B.P. If this is the case, current explanations of the extinctions are in need of extensive modification.

Type
Articles
Information
Quaternary Research , Volume 28 , Issue 2 , September 1987 , pp. 281 - 289
Copyright
University of Washington

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