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By such differences as these the following drift sheets have been made out in America, and similar subdivisions have been recognized in Europe. 5 The Wisconsin formation 4 The Iowan formation 3 The Illinoian formation 2 The Kansan formation 1 The pre-Kansan or Jerseyan formation
The lecture committee in Illinois in 1856 told him that the people wanted a hearty laugh. "The stout Illinoian," not finding the laugh, "after a short trial walks out of the hall." I think even his best Eastern audiences were always a good deal puzzled. The lecturer never tried to meet them halfway.
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.
The two succeeding stages mark the greatest snowfall of the Glacial epoch. In Kansan times the Keewatin ice field slowly grew southward until it reached fifteen hundred miles from its center of dispersion and extended from the Arctic Ocean to northeastern Kansas. In the Illinoian stage the Labrador ice field stretched from Hudson Straits nearly to the Ohio River in Illinois.
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