Steven Dutch, Professor Emeritus, Natural and Applied Sciences, University of Wisconsin - Green Bay

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Limestones and shales north of Milwaukee are the only Devonian units in Wisconsin. Some of these contain natural asphalt, the only hydrocarbon occurrence in Wisconsin. Early geologic literature also mentioned a tiny exposure of Mississippian rocks at one locality along the lakeshore.

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Created 11 Sep 1997, Last Update 11 January 2020