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Science 24 October 1980:
Vol. 210. no. 4468, pp. 423 - 425
DOI: 10.1126/science.210.4468.423
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Articles

Upper Wisconsinan Till Recovered on the Continental Shelf Southeast of New England

MICHAEL H. BOTHNER 1 and ELLIOTT C. SPIKER 2

1 U.S. Geological Survey, Woods Hole, Massachusetts 02543
2 U.S. Geological Survey, Reston, Virginia 22092

Basal till was identified in two sediment cores collected about 69 kilometers southeast of Nantucket Island on the east and west sides of Great South Channel. These are the first samples of till collected on the outer continental shelf off the northeastern United States. The carbon-14 age of the total organic carbon in the tills provides a "no older than" age of about 20,000 years before present and suggests that the tills were deposited during the late Wisconsinan glaciation. This conclusion is in support of the hypothesis of an extensive Laurentide ice sheet that extended to the northern side of Georges Bank.

Submitted on June 17, 1980

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Science. ISSN 0036-8075 (print), 1095-9203 (online)