Articles | Volume 5, issue 2
https://doi.org/10.5194/gchron-5-413-2023
https://doi.org/10.5194/gchron-5-413-2023
Research article
 | 
29 Nov 2023
Research article |  | 29 Nov 2023

Early Holocene ice retreat from Isle Royale in the Laurentian Great Lakes constrained with 10Be exposure-age dating

Eric W. Portenga, David J. Ullman, Lee B. Corbett, Paul R. Bierman, and Marc W. Caffee

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Cited articles

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Balco, G., Stone, J. O., Lifton, N. A., and Dunai, T. J.: A complete and easily accessible means of calculating surface exposure ages or erosion rates from 10Be and 26Al measurements, Quat. Geochronol., 3, 174–195, https://doi.org/10.1016/j.quageo.2007.12.001, 2008. 
Balco, G., Briner, J., Finkel, R. C., Rayburn, J. A., Ridge, J. C., and Schaefer, J. M.: Regional beryllium-10 production rate calibration for late-glacial northeastern North America, Quat. Geochronol., 4, 93–107, https://doi.org/10.1016/j.quageo.2008.09.001, 2009. 
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Breckenridge, A., Johnson, T. C., Beske-Diehl, S., and Mothersill, J. S.: The timing of regional Lateglacial events and post-glacial sedimentation rates from Lake Superior, Quaternary Sci. Rev., 23, 2355–2367, https://doi.org/10.1016/j.quascirev.2004.04.007, 2004. 
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Short summary
New exposure ages of glacial erratics on moraines on Isle Royale – the largest island in North America's Lake Superior – show that the Laurentide Ice Sheet did not retreat from the island nor the south shores of Lake Superior until the early Holocene, which is later than previously thought. These new ages unify regional ice retreat histories from the mainland, the Lake Superior lake-bottom stratigraphy, underwater moraines, and meltwater drainage pathways through the Laurentian Great Lakes.