View source for Grayson: "extinct North American mammals...losses began in Mexico and Alaska during the Pleistocene and ended in Florida perhaps as recently as 2000 years ago"

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==Grayson: "extinct North American mammals...losses began in Mexico and Alaska during the Pleistocene and ended in Florida perhaps as recently as 2000 years ago"==
Grayson:
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In the first thorough review of radiocarbon dates associated with the extinct North American mammals, Martin (1958) concluded that the losses began in Mexico and Alaska during the Pleistocene and ended in Florida perhaps as recently as 2000 years ago (1958:405). Soon after, however, Hester (1960:58) concluded that the great majority of herd animals seemed to have been lost swiftly and together around 8,000 years ago even if some, like the mastodon, may have lingered on beyond then. Hester was thus the first to suggest, based on radiocarbon evidence, that a significant number, if not all, of the North American extinctions were synchronous. <ref>Donald K. Grayson (Department of Anthropology, University of Washington, Seattle, WA 98195), [http://anthro.utah.edu/PDFs/grayson--jar07.pdf "Deciphering North American Pleistocene Extinctions,"] ''Journal of Anthropological Research'', in press (2007 JAR Distinguished Lecture) </ref>
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[[es:Fuente:Grayson:Deciphering North American Pleistocene Extinctions:5:pérdidas ... finalizados en Florida quizá tan recientemente como hace 2000 años]]
[[pt:Fonte:Grayson:Deciphering North American Pleistocene Extinctions:5:perdas ... encerrados na Flórida talvez tão recentemente quanto 2000 anos atrás]]