| Online link | https://doi.org/10.3133/ofr99547 |
|---|---|
| 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 |