Glacial Geology | Quaternary Geology Section | Quaternary Geology Section Staff

Quaternary History in Illinois

These are sketch maps showing the Quaternary drainage history and inferred ice-margin positions during the preglacial, pre-Illinois, Yarmouth, Illinois, Sangamon, and Wisconsin episodes. The numbers indicate the sequence of ice-margin advances during glacial episodes.

Quaternary History in Illinois

Updated 12/9/2009 SLD

ILLINOIS STATE GEOLOGICAL SURVEY
E. Donald McKay, III, Director

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