Surging of the southwestern part of the Laurentide Ice Sheet |
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| Authors: | LEE CLAYTON JAMES T TELLER JOHN W ATTIG |
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| Institution: | Wisconsin Geological and Natural History Survey, 3817 Mineral Point Road, Madison, Wisconsin 53705, U.S.A.;Department of Earth Sciences, University of Manitoba, Winnipeg, Manitoba R3T 2N2, Canada;Department of Geology and Geophysics, University of Wisconsin. Madison, Wisconsin 53706, U.S.A.;21st June, 1984 |
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| Abstract: | The southwestern part of the Laurentidc Ice Sheet, in central North America, repeatedly surged during the last part of the Wisconsin Glaciation. Evidence includes the extreme lobation of the ice margin, the gentle slopes of lateral moraines and other marginal features, a radiocarbon chronology indicating extremely rapid marginal advance and retreat, and the abundance of supraglacial flow till. Rapid ice movement was caused by subglacial water and was probably limited to areas of slowly permeable substrate, which slowed the escape of the water. |
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