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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.


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