Oneota Formation
Stratigraphic range: Ordovician
Sugar Loaf Bluff, Oneota Formation
TypeFormation
Unit ofPrairie du Chien Group
Sub-unitsKasota limestone
UnderliesShakopee Dolomite
OverliesJordan Sandstone and Potosi Dolomite
Location
RegionMidwestern United States
CountryUnited States
ExtentIllinois, Indiana, Minnesota, and Wisconsin

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]

The Sugar Loaf landmark located in Winona, Minnesota is made of Oneota Dolomite.

See also

References

  1. "Oneota Dolomite".


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