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Cosmogenic Nuclide Laboratory and Geomorphology Research Group

Deglaciation and Inheritance, Wisconsin



In an attempt to date retreat of the Laurentide ice sheet from central North America, we sampled outcrops of different lithologies at different distances from the paleo-ice margin. We found extremely high inventories of 10Be and discordant 10Be/26Al ratios in hard rocks near the ice margin suggesting that glacial erosion where the ice had been thin and cold was not effective in removing the uppermost several meters of rock that had been exposed to cosmic rays during the last interglacial.
Project Support
NSF Dating Wisconsin ice retreat subcontract
Proposal Project Summary (not yet available)
People Working on this Project
Paul Bierman
Marc Caffee
Patrick Colgan
Christine Massey
David Mickelson
Susan Nies
Publications Related to this Project

Colgan, P.M., Bierman, P.R., Mickelson, D.M., and Caffee, M.W., 2002, Variation in glacial erosion near the southern margin of the Laurentide Ice Sheet, south-central Wisconsin, USA: Implications for cosmogenic dating of glacial terrains: Geological Society of America Bulletin, v. 114, p. 1581-1591. (download pdf)
Abstracts Related to this Project

Bierman, P.R., Davis, P.T., Marsella, K., Colgan, P.M., Mickelson, D.M., Larsen, P., and Caffee, M., 1998, What do glaciers take away? What do they leave behind?: Geological Society of America, 1998 annual meeting Abstracts with Programs - Geological Society of America, v. 30, p. 299. (download pdf)

Colgan, P.M., Mickelson, D.M., Bierman, P.R., and Caffee, M., 1998, Cosmogenic 10-Be and 26-Al evidence for an early deglaciation of the Green Bay Lobe, before 15,500 calendar years bp: Geological Society of America, 1998 annual meeting Abstracts with Programs - Geological Society of America, v. 30, p. 135. (download pdf)

Last modified January 27 2009 10:03 AM

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