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Learn about Wisconsin glaciations
Ice sheets probably first began to creep over our state more than 2 million years ago, but it is the impact of the most recent, called the Wisconsin Glaciation, that is highly visible today. Beginning about 25,000 years ago, fingers of ice, called lobes (pictured here) scoured part of the state and left behind characteristic debris. It is this most recent ice advance on which a newly revised publication of the Wisconsin Geological and Natural History Survey focuses. Originally published in 1991, and revised in 1992, this third edition of a 4-page brochure tells its story primarily through illustrations. Maps of the state show the glacial lobes, directions of ice flow, extent of various glacial events, and distribution of glacial deposits. A chart associates these events with the type of lithostratigraphic units that were deposited by the various lobes. Glaciation of Wisconsin (Educational Series 36), by Lee Clayton, J.W. Attig, D.M. Mickelson, M.D. Johnson, and K.M. Syverson, is priced at $1 per copy, Shipping charges are extra; refer to our order form, which is in Adobe® Acrobat® format. Call or write the Wisconsin Geological and Natural History Survey, 3817 Mineral Point Road, Madison, Wisconsin 53705-5100; telephone 608/263.7389. Visa and MasterCard are accepted.
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Updated 28 July 2006 |
The ebb and flow of continental ice sheets had a profound effect upon the landscape that we see today in Wisconsin. Glaciers are responsible for the shape of the land, even in areas that were not touched by the ice itself.