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1 Institute of Arctic and Alpine Research and Department of Geological Sciences, University of Colorado, Boulder, Colorado 80303, USA
2 Department of Geology and Department of Environmental Sciences, Northern Arizona University, Flagstaff, Arizona 86011, USA
3 Department of Earth and Environment, Mount Holyoke College, South Hadley, Massachusetts 01075, USA
4 Purdue Rare Isotope Measurement Laboratory and Department of Physics, Purdue University, West Lafayette, Indiana 47907, USA
5 Department of Geology, Northern Arizona University, Flagstaff, Arizona 86011, USA
6 Institute of Arctic and Alpine Research, University of Colorado, Boulder, Colorado 80303, USA
7 Department of Geology and Geophysics, University of Wisconsin, Madison, Wisconsin 53706, USA
8 Center for Accelerator Mass Spectrometry, Lawrence Livermore National Laboratory, Livermore, California 94550, USA
An expansion of alpine glaciers during the latest Pleistocene produced an extraordinarily well defined end moraine system in the Ahklun Mountains, southwestern Alaska. These moraines, deposited during the Mount Waskey advance, are several kilometers beyond modern glacier termini, and 
80 km upvalley of the late Wisconsin Ahklun Mountains ice cap terminal moraine. Eleven cosmogenic 10Be and 26Al exposure ages on moraine boulders, combined with radiocarbon ages from a lake core upvalley of a moraine deposited during the Mount Waskey advance, suggest that the advance culminated between 12.4 and 11.0 ka, sometime during, or shortly following, the Younger Dryas event (ca. 12.9–11.6 ka). We believe that the Mount Waskey advance was a consequence of cooling during the Younger Dryas. These data further strengthen emerging evidence for Younger Dryas–age cooling of the North Pacific region.
Key Words: Alaska • cosmogenic exposure dating • glaciers • Younger Dryas • late glacial
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