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Science 14 January 2005:
Vol. 307. no. 5707, p. 222
DOI: 10.1126/science.1103406
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Brevia

The First Glacial Maximum in North America

Greg Balco,1* Charles W. Rovey, II,2 John O. H. Stone1

Despite marine evidence for at least 50 Pliocene-Pleistocene ice sheet advances, only the most recent one has been accurately reconstructed from terrestrial evidence, because there are few techniques for dating older glacial deposits. Here we show that the cosmic ray–produced nuclides beryllium-10 and aluminum-26 can be used to date tills that overlie paleosols.

1 Quaternary Research Center and Department of Earth and Space Sciences, University of Washington, Seattle, WA 98915, USA.
2 Department of Geography, Geology, and Planning, Southwest Missouri State University, Springfield, MO 65804, USA.

* To whom correspondence should be addressed. E-mail: balcs{at}u.washington.edu

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