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Surface exposure dating of the Pierre Sublobe of the James Lobe, Laurentide Ice Sheet

Published online by Cambridge University Press:  13 April 2020

Stephanie L. Heath Open the ORCID record for Stephanie L. Heath [Opens in a new window] ,
Thomas V. Lowell  and
Brenda L. Hall
Stephanie L. Heath*
Affiliation:
Department of Geology, University of Cincinnati, Cincinnati, Ohio45221, USA
Thomas V. Lowell
Affiliation:
Department of Geology, University of Cincinnati, Cincinnati, Ohio45221, USA
Brenda L. Hall
Affiliation:
School of Earth and Climate Sciences and the Climate Change Institute, University of Maine, Orono, Maine04469, USA
*
*Corresponding author at: Department of Geology, University of Cincinnati, 500 Geology/Physics Building, Cincinnati, Ohio45221. E-mail address: [email protected] (S.L. Heath).
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Abstract

The Laurentide Ice Sheet of the last glacial period terminated in several lobes along its southern margin. The timing of maximum extent may have varied among the terminal lobes owing to internal ice sheet dynamics and spatially variable external controls. Some terminal ice lobes, such as the westernmost James Lobe, remain poorly dated. To determine the timing of maximum ice extent in this key location, we have mapped glacial deposits left by the Pierre Sublobe in South Dakota and applied 10Be surface exposure age dating on boulders on moraine ridges associated with three distinct late Quaternary glacial drifts. The oldest and most extensive “Tazewell” drift produced variable 10Be surface exposure ages spanning 20–7 ka; the large range is likely attributable to moraine degradation and subsequent boulder exhumation. The oldest ages of about 20 ka are probably limiting minimum ages for the Tazewell moraine surfaces. By contrast, exposure ages of the youngest “Mankato” drift of the easternmost Pierre Sublobe tightly cluster at about 16 ka. This age for the Pierre Sublobe is consistent with the nearby Des Moines Lobe, suggesting both acted together.

Type
Research Article
Information
Quaternary Research , Volume 97 , September 2020 , pp. 88 - 98
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Copyright
Copyright © University of Washington. Published by Cambridge University Press, 2020

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