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Science 6 April 1984:
Vol. 224. no. 4644, pp. 61 - 63
DOI: 10.1126/science.224.4644.61
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Articles

Enhanced Atmospheric Circulation over North America During the Early Holocene: Evidence from Lake Superior

JOHN D. HALFMAN 1 and THOMAS C. JOHNSON 1

1 Duke University Marine Laboratory, Beaufort, North Carolina 28516

Profiles of grain sizes in five cores recovered from Lake Superior show that grain size increased with burial depth to the postglacial-glacial contact. The results reflect a substantial reduction in bottom-current velocity and the corresponding wind velocity from 9500 to 6500 years ago.

Submitted on September 1, 1983
Accepted on January 10, 1984

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