Online link | http://pubs.usgs.gov/of/1999/of99-547/ |
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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. and Ottke, Doug |
Publication | U.S. Geological Survey Open-File Report 99-547 |