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Glacial Till Diamicton
Crevecoeur Nature Preserve, Creve Coeur, Illinois
This diamicton outcropping is located on the terminal moraine of the Wisconsin glacier at Fort Crevecoeur Park, Tazewell County, on bluffs overlooking the Illinois River valley. It is a mixture of gravel and smaller grains that appear as if cemented together into a friable solid matrix. In places animals have dug small caves into the brittle solid. This photograph was taken by Mitch Lovgren.