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Updated: May 7, 2025
South of the driftless area the Mississippi valley was invaded at different times by ice sheets from the west, the Kansan and the Iowan, and again by the Illinoian ice sheet from the east. Again and again the Mississippi River was pushed to one side or the other of its path. The ancient channel which it held along the Illinoian ice front has been traced through southeastern Iowa for many miles.
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