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Late Pleistocene Vertebrates from Downtown San Francisco, California

Peter U. Rodda and Nina Baghai
Journal of Paleontology
Vol. 67, No. 6 (Nov., 1993), pp. 1058-1063
Published by: Paleontological Society
Stable URL: http://www.jstor.org/stable/1306122
Page Count: 6
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Late Pleistocene Vertebrates from Downtown San Francisco, California
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Abstract

Disarticulated elements from three individuals of Mammuthus cf. M. columbi (Falconer) and one individual of Bison cf. B. latifrons (Harlan) were recovered from an excavation in gravelly, sandy clay of the Colma Formation at the southeast base of Telegraph Hill, San Francisco, California. This is the most abundant collection of late Pleistocene terrestrial vertebrates reported from San Francisco, and only the fourth record from excavations in the city proper. The Mammuthus-Bison association indicates a Rancholabrean age, and elements of these two taxa from this site have been radiocarbon dated at 25,380 ± 1,100 years B.P. Geologic setting, lithology, associated diatoms and pollen, and preservation of the bones suggest that these animals were buried rapidly in a boggy environment on the west margin of the broad valley now occupied by San Francisco Bay.

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