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Southern outlet and basin of glacial Lake Agassiz

By
Timothy G. Fisher
Timothy G. Fisher
Department of Environmental Sciences, University of Toledo, Toledo, Ohio 43606, USA
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;
Ken Lepper
Ken Lepper
Department of Geosciences, North Dakota State University, Fargo, North Dakota 58108, USA
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;
Allan C. Ashworth
Allan C. Ashworth
Department of Geosciences, North Dakota State University, Fargo, North Dakota 58108, USA
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;
Howard C. Hobbs
Howard C. Hobbs
Minnesota Geological Survey, 2642 University Avenue West, St. Paul, Minnesota 55114-1032, USA
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Published:
January 01, 2011

ABSTRACT

Reconstructing the drainage from glacial Lake Agassiz to explain episodes of abrupt climate change during the last glacial termination has a long and colorful past. The type strandlines in the basin are named for the towns of Herman, Norcross, Tintah, and Campbell. Optically stimulated luminescence dating of these and other strandlines from the southern basin of Lake Agassiz enables estimating times of water level stability and outlet incision. Tracing strandlines to the north is complicated by their increasing number and often discontinuous nature. Much of the meltwater entering the Mississippi River was channelized through Lake Agassiz’s southern outlet. The spillway is floored by boulder lags and bedrock. Two cores penetrating through to bedrock have provided the most detailed history of southerly lake drainage. On the first day of the trip, we will travel to strandlines on both sides of the southernmost Agassiz basin and view the glaciolacustrine stratigraphy at Fargo, North Dakota; on the second day, we will visit more strandlines and the southern outlet spillway.

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GSA Field Guide

Archean to Anthropocene: Field Guides to the Geology of the Mid-Continent of North America

James D. Miller
James D. Miller
Department of Geological Sciences and Precambrian Research Center University of Minnesota-Duluth Duluth, Minnesota 55812 USA
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;
George J. Hudak
George J. Hudak
Precambrian Research Center Natural Resources Research Institute 5013 Miller Trunk Highway Duluth, Minnesota 55811 USA
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;
Chad Wittkop
Chad Wittkop
Department of Chemistry and Geology Minnesota State University Mankato, Minnesota 56001 USA
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;
Patrick I. McLaughlin
Patrick I. McLaughlin
Wisconsin Geological and Natural History Survey Madison, Wisconsin 53705 USA
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Geological Society of America
Volume
24
ISBN electronic:
9780813756240
Publication date:
January 01, 2011

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