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Preservation and Recognition of Middle and Early Pleistocene Loess in the Driftless Area, Wisconsin

Published online by Cambridge University Press:  20 January 2017

Peter M. Jacobs
Affiliation:
Department of Physics, Astronomy, and Geology, Valdosta State University, Valdosta, Georgia, 31698
James C. Knox
Affiliation:
Department of Geography, University of Wisconsin, Madison, Wisconsin, 53706
Joseph A. Mason
Affiliation:
Department of Geography, Northern Illinois University, Dekalb, Illinois, 60115

Abstract

An exceptional stratigraphic and pedologic record of Pleistocene environmental conditions occurs at the Kieler Site in the Driftless Area of southwestern Wisconsin. Peoria, Roxana, Loveland, and pre-Loveland loesses overlie weathered bedrock residuum. The pre-Loveland unit previously has been included as part of the residuum at other Driftless Area sites. Early and middle Pleistocene loesses in the Mississippi Valley are normally absent at most localities. Rather than nondeposition, we suggest the apparent absence of pre-Illinoian loess units is due in part to erosion, but also to weathering that renders loesses unrecognizable so they are classified as “residuum.”

Type
Original Articles
Copyright
University of Washington

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