Oneota Dolomite
The Oneota Formation is a geologic formation in the upper Midwest (United States) including Minnesota, Illinois, Indiana and Wisconsin. It preserves marine fossils dating back to the Ordovician period.[1]
| Oneota Formation | |
|---|---|
| Stratigraphic range: Ordovician | |
 Sugar Loaf Bluff, Oneota Formation | |
| Type | Formation |
| Unit of | Prairie du Chien Group |
| Sub-units | Kasota limestone |
| Underlies | Shakopee Dolomite |
| Overlies | Jordan Sandstone and Potosi Dolomite |
| Location | |
| Region | Midwestern United States |
| Country | United States |
| Extent | Illinois, Indiana, Minnesota, and Wisconsin |
The Sugar Loaf landmark located in Winona, Minnesota is made of Oneota Dolomite.
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