| Online link | http://pubs.usgs.gov/of/1999/of99-547/ |
|---|---|
| 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 |