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Radiocarbon “Wiggles” in Great Lakes Wood at About 10,000 to 12,000 BP

Published online by Cambridge University Press:  18 July 2016

Steven W Leavitt*
Affiliation:
Laboratory of Tree-Ring Research, University of Arizona, Tucson, Arizona 85721, USA
Irina P Panyushkina
Affiliation:
Laboratory of Tree-Ring Research, University of Arizona, Tucson, Arizona 85721, USA
Todd Lange
Affiliation:
Department of Physics, University of Arizona, Tucson, Arizona 85721, USA
Li Cheng
Affiliation:
Department of Physics, University of Arizona, Tucson, Arizona 85721, USA
Allan F Schneider
Affiliation:
Retired. Dept. of Geology, University of Wisconsin-Parkside, Kenosha, Wisconsin 53141-2000, USA
John Hughes
Affiliation:
Retired. Dept. of Geography, Earth Science, Conservation, and Planning, Northern Michigan University, Marquette, Michigan 49855, USA
*
Corresponding author. Email: sleavitt@ltrr.arizona.edu
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Abstract

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High-resolution radiocarbon calibration for the last 14,000 cal yr has been developed in large part using European oaks and pines. Recent subfossil wood collections from the Great Lakes region provide an opportunity to measure 14C activity in decadal series of rings in North America prior to the White Mountains bristlecone record. We developed decadal 14C series from wood at the classic Two Creeks site (∼11,850 BP) in east-central Wisconsin, the Liverpool East site (∼10,250 BP) in northwestern Indiana, and the Gribben Basin site (∼10,000 BP) in the Upper Peninsula of Michigan. Initial AMS dates on holocellulose produced younger-than-expected ages for most Two Creeks subsamples and for a few samples from the other sites, prompting a systematic comparison of chemical pretreatment using 2 samples from each site, and employing holocellulose, AAA-treated holocellulose, alpha-cellulose, and AAA-treated whole wood. The testing could not definitively reveal the source of error in the original analyses, but the “best” original ages together with new AAA-treated holocellulose and α-cellulose ages were visually fitted to the IntCal04 calibration curve at ages of 13,760–13,530 cal BP for the Two Creeks wood, 12,100–12,020 cal BP for Liverpool East, and 11,300–11,170 cal BP for Gribben Basin. The Liverpool East age falls squarely within the Younger Dryas (YD) period, whereas the Gribben Basin age appears to postdate the YD by ∼300 yr, although high scatter in the decadal Gribben Basin results could accommodate an older age nearer the end of the YD.

Type
Articles
Copyright
Copyright © 2007 by the Arizona Board of Regents on behalf of the University of Arizona 

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