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Old Crow tephra: a new Late Pleistocene stratigraphic marker across north-central Alaska and western Yukon Territory

Auteurs :
WESTGATE, J. A.
HAMILTON, T. D.
GORTON, M. P.

Description :
Old Crow tephra is the first extensive Pleistocene tephra unit to be documented in the northwestern part of North America. It has an age between the limits of 60,000 and 12,000 yr, set by C and fission-track measurements, respectively. Old Crow tephra has been recognized in the Koyukuk Basin and Fairbanks region of Alaska, and in the Old Crow Lowlands of the northern Yukon Territory, some 600 km to the east-northeast. The source vent is unknown, but these occurrences, considered in relation to the distant locations of potential Quaternary volcanic sources, demonstrate the widespread distribution of this tephra and underscore its importance as a regional stratigraphic marker.


Type de document :
Article de périodique

Source :
Quaternary research New York, 1983, vol. 19, n°. 1, p. 38-54, Références bibliographiques : 27 réf.

Date :
1983

Langue :
Anglais
Droits :
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