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

Related authors

Comparison of basin-scale in situ and meteoric 10Be erosion and denudation rates in felsic lithologies across an elevation gradient at the George River, northeast Tasmania, Australia
Leah A. VanLandingham, Eric W. Portenga, Edward C. Lefroy, Amanda H. Schmidt, Paul R. Bierman, and Alan J. Hidy
Geochronology, 4, 153–176, https://doi.org/10.5194/gchron-4-153-2022,https://doi.org/10.5194/gchron-4-153-2022, 2022
Short summary

Cited articles

Bajc, A. F., Morgan, A. V., and Warner, B. G.: Age and paleoecological significance of an early postglacial fossil assemblage near Marathon, Ontario, Canada, Can. J. Earth Sci., 34, 687–698, https://doi.org/10.1139/e17-055, 1997. 
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. 
Black, R. F.: Quaternary geology of Wisconsin and contiguous Upper Michigan, in: Quaternary stratigraphy of North America, edited by: Mahaney, W. C., Dowden, Hutchinson & Ross, Halsted Press, Stroudsburg, Pa., New York, 1976. 
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. 
Download
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.
Share