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Middle Pleistocene Mollusks from St. Lawrence Island and their Significance for the Paleo-Oceanography of the Bering Sea 1

Published online by Cambridge University Press:  20 January 2017

David M. Hopkins
Affiliation:
U.S. Geological Survey, Menlo Park, CA 94025 USA
Robert W. Rowland
Affiliation:
Geology Department, University of California, Davis, CA 95610 USA
William W. Patton Jr.
Affiliation:
U.S. Geological Survey, Menlo Park, CA 94025 USA

Abstract

Drift, evidently of Illinoian age, was deposited on St. Lawrence Island at the margin of an ice cap that covered the highlands of the Chukotka Peninsula of Siberia and spread far eastward on the continental shelf of northern Bering Sea. Underlying the drift on the northwestward part of the island are mollusk-bearing beds deposited during the Kotzebuan Transgression.

A comparison of mollusk faunas from St. Lawrence Island, Chukotka Peninsula, and Kotzebue Sound suggests that the present northward flow through Bering and Anadyr Straits was reversed during the Kotzebuan Transgression. Cold arctic water penetrated southward and southwestward bringing an arctic fauna to the Gulf of Anadyr. Warmer Pacific water probably entered eastern Bering Sea, passed eastward and northeastward around eastern and northern St. Lawrence Island, and then became entrained in the southward currents that passed through Anadyr Strait.

Type
Original Articles
Copyright
Academic Press, Inc.

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Footnotes

1

Publication authorized by the Director, U.S. Geological Survey.

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