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An Anvilian (Early Pleistocene) Marine Fauna from Western Seward Peninsula, Alaska

Published online by Cambridge University Press:  20 January 2017

D.M. Hopkins ,
R.W. Rowland ,
R.E. Echols  and
P.C. Valentine
D.M. Hopkins
Affiliation:
U.S. Geological Survey, 345 Middlefield Road, Menlo Park, CA 94025 USA.
R.W. Rowland
Affiliation:
U.S. Geological Survey, 345 Middlefield Road, Menlo Park, CA 94025 USA.
R.E. Echols
Affiliation:
Oceanography Department, University of Washington, Seattle, WA 98105 USA.
P.C. Valentine
Affiliation:
U.S. Geological Survey, Woods Hole Oceanographic Institution, Woods Hole, MA 02543 USA.
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Abstract

Cover sediments of the York Terrace exposed near the California River, western Seward Peninsula, Alaska, yield mollusks, ostracodes, and foraminifera that lived during the Anvilian transgression of early Pleistocene age. The fossiliferous sediments lie at the inner edge of the York Terrace, a deformed wave-cut platform that extends eastward from Bering Strait along much of the southern coast of Seward Peninsula. The seaward margin is truncated by the little-deformed Lost River Terrace, carved during the Pelukian (Sangamonian) transgression. The early Pleistocene sediments seem to have been deposited between the first and second of four glaciations for which evidence can be found in the California River area.

The California River fauna includes several extinct species and several species now confined to areas as remote as the northwestern Pacific and north Atlantic. The fauna probably lived in water temperatures much like those of the present time but deeper water on the Bering Shelf is suggested.

The presence of an early Pleistocene fauna at the inner edge of the York Terrace at California River shows that the terrace was largely carved before and during early Pleistocene time. However, a marine fauna apparently of middle Pleistocene age is found on the York Terrace near Cassiterite Peak, and this seems to indicate that the terrace remained low until middle Pleistocene time. Uplift of the York Terrace probably was accompanied by uplift of Bering Strait. The strait may have been deeper, and there may have been no land bridge between the Seward Peninsula of Alaksa and the Chukotka Peninsula of Siberia during most of early and middle Pleistocene time.

Type
Original Articles
Information
Quaternary Research , Volume 4 , Issue 4 , December 1974 , pp. 441 - 470
Copyright
University of Washington

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