Davis Formation
Geologic formation in Indiana and Missouri, United States
From Wikipedia, the free encyclopedia
The Davis Formation is a geologic formation in Indiana and Missouri. It preserves fossils dating back to the Cambrian period.
TypeFormation
Unit ofElvins Group (in Missouri)[1] and Munising Group (in Indiana)
UnderliesDerby-Doerun Dolomite and Potosi Dolomite
OverliesBonneterre Formation
| Davis Formation | |
|---|---|
| Stratigraphic range: Upper Cambrian | |
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 |
| Thickness | 170 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 for | Outcrops along Davis Creek, St. Francois County, Missouri |
