Preliminary digital geologic map of the Penokean (early Proterozoic) continental margin in northern Michigan and Wisconsin

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Description This map portrays the geology of Early Proterozoic rocks deposited along the southern margin of the Archean Superior craton during the Penokean orogenic cycle in northern Michigan and Wisconsin.
Originators Cannon, William F., Ottke, Doug
Publication U.S. Geological Survey Open-File Report 99-547

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