Davis Formation

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Davis Formation
Stratigraphic range: Upper Cambrian
Ocnerorthis monticola.jpg
Ocnerorthis monticola, fossil from the Davis Formation in Missouri
Type Formation
Unit of Elvins Group (in Missouri) [1] and Munising Group (in Indiana)
Underlies Derby-Doerun Dolomite and Potosi Dolomite
Overlies Bonneterre Formation
Thickness170 ft. average, 225 ft. maximum [2]
Lithology
Primary Shale, Siltstone
Other Sandstone, dolomite, limestone conglomerate [2]
Location
Country United States
Extent Illinois, Indiana, Minnesota, and Missouri
Type section
Named forOutcrops along Davis Creek, St. Francois County, Missouri

The Davis Formation is a geologic formation in Indiana and Missouri. It preserves fossils dating back to the Cambrian period.

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