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Old Crow Tephra Found at the Palisades of the Yukon, Alaska

Published online by Cambridge University Press:  20 January 2017

James Begét ,
Mary Edwards ,
David Hopkins ,
Mary Keskinen  and
George Kukla
James Begét
Affiliation:
Department of Geology and Geophysics, University of Alaska, Fairbanks, AlaskaUSA 99775-0760
Mary Edwards
Affiliation:
Department of Geology and Geophysics, University of Alaska, Fairbanks, AlaskaUSA 99775-0760
David Hopkins
Affiliation:
Department of Geology and Geophysics, University of Alaska, Fairbanks, AlaskaUSA 99775-0760
Mary Keskinen
Affiliation:
Department of Geology and Geophysics, University of Alaska, Fairbanks, AlaskaUSA 99775-0760
George Kukla
Affiliation:
Lamont-Doherty Geological Observatory, Columbia University, Palisades, New York 10964, USA
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Abstract

A 20-cm-thick volcanic ash layer at the Palisades along the Yukon River is geochemically correlated with the Old Crow tephra. A buried organic and wood-rich layer above the Old Crow tephra probably records the last interglaciation. The recognition of the Old Crow tephra provides the first chronologic information on the age of the thick sequence of Pleistocene sediments at the Palisades, an important ice-age mammal site in central Alaska and a key locality for the reconstruction of the history of the Yukon River and the last interglaciation in central Alaska.

Type
Short Paper
Information
Quaternary Research , Volume 35 , Issue 2 , March 1991 , pp. 291 - 297
Copyright
University of Washington

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