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Major ice sheet response in eastern New England to a cold North Atlantic region, ca. 16–15 cal ka BP

Published online by Cambridge University Press:  20 January 2017

Michael R. Kaplan
Michael R. Kaplan*
Affiliation:
Geochemistry, LDEO, P.O. Box 1000, Palisades, NY 10964, USA
*
E-mail address:[email protected].
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Abstract

A large ice sheet still covered almost all of Maine and eastern New England until ca. 15 cal ka BP, reaching south of 45 °S, despite rising summer insolation intensity and major ice recession elsewhere outside the North Atlantic region. Furthermore, the well-studied moraine belt along eastern coastal Maine, including the prominent Pineo Ridge delta/moraine complex and Pond Ridge moraine, indicates repeated readvances and stillstands between ca. 16 and 15 cal ka BP. This moraine belt reflects a considerable ice sheet response over eastern North America during this time period, coeval with the latter half of the European Oldest Dryas period. Moraine deposition was concurrent with reduction or elimination of North Atlantic meridional overturning, starting with the earlier onset of peak IRD and Heinrich Event 1 (HE-1). The existing 14C chronology suggests that the coastal moraine belt and the persistence of the ice sheet until ∼ 15 cal ka BP was a response to the severe cooling of the North Atlantic region after ∼ 17 cal ka BP.

Keywords

PaleoclimatologyMaineGlacial geologyPaleoceanographyRadiocarbon
Type
Short Paper
Information
Quaternary Research , Volume 68 , Issue 2 , September 2007 , pp. 280 - 283
Copyright
University of Washington

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