Steven Dutch University of Wisconsin - Green Bay
| Time (Ma) | Event | Location | Geological Effects |
|---|---|---|---|
| 700? | Sandstone Deposition | Lake Superior | Deposition of red Jacobsville Sandstone in Upper Peninsula of Michigan |
| 1000 | Grenville Orogeny | Labrador, Quebec, Ontario, SE Michigan, Ohio, Kentucky? | Collision of a continent with eastern North America resulted in metamorphism and deformation in eastern North America. Compression and thrust faulting in Mid-Continent Rift System. |
| 1100 | Mid-Continent Rifting | Lake Superior SW to Kansas, possibly SE to Indiana and Ohio | Probably the result of the initial collision of the Grenville continent with North America. Basalt volcanism and mafic intrusions followed by coarse terrestrial sediment deposition. |
| 1400 | Spavinaw Rhyolite Terrane | Missouri and adjacent states. | Widespread rhyolitic volcanism. Part of extensive silicic igneous activity in the Midcontinent during the middle Proterozoic but not known to occur in Wisconsin. |
| 1485 | Wolf River Batholith | East-Central Wisconsin | Large anorogenic granitic intrusion. Granitic intrusions of similar age occur in the basement of the Midcontinent and in the Rocky Mountains. |
| 1600? | Baraboo Interval Quartzites | Wisconsin, Minnesota, Iowa, South Dakota | Waterloo, Baraboo, Necedah, McCaslin and Rib Mountain quartzites. Barron Quartzite in NW Wisconsin may correspond to Sioux Quartzite in Minnesota, Iowa, and S. Dakota |
| 1700 | Baraboo Interval Igneous Activity | South-Central Wisconsin | Anorogenic granitic intrusions and rhyolite volcanism. |
| 1800 | Penokean Granitic Intrusions | North-Central Wisconsin | Late igneous activity of the Penokean Orogeny |
| 1900 | Penokean Orogeny | Wisconsin, Minnesota, Michigan | Collision of the Superior, Wausau-Pembine and Marshfield Terranes with accompanying metamorphism and deformation. |
| 2000 | Proterozoic Volcanism | North-central Wisconsin | Volcanic arc terrane; basaltic volcanism, volcanogenic sedimentation, and mafic intrusions. |
| 2000-2300 | Proterozoic Sedimentation | Northernmost Wisconsin and upper Michigan. | Continental shelf-slope sedimentation along the southern edge of the Superior Province craton. Epicratonic sedimentation in Minnesota and Ontario. |
| 2500 | Archean | Formation of crust of Superior and Marshfield crustal blocks. |
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Created February 21, 1997; Last Update 3 May 1999
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