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In page Lake Chicago:
"When the ice retreated northward enough to open the Mohawk River valley, the waters in the Lake Huron and Lake Erie basin diverted from the Michigan outlet, leaving Lake Chicago as a headwaters lake. Continued northward migration of the glacier, set the stage for the next major proglacial lakes in the Lake Michigan basin as Lake Algonquin and then Nipissing Great Lakes.[2]
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