Davis Formation

Davis Formation
Stratigraphic range: Upper Cambrian
Ocnerorthis monticola, fossil from the Davis Formation in Missouri
TypeFormation
Unit ofElvins Group (in Missouri)[1] and Munising Group (in Indiana)
UnderliesDerby-Doerun Dolomite and Potosi Dolomite
OverliesBonneterre Formation
Thickness170 ft. average, 225 ft. maximum[2]
Lithology
PrimaryShale, Siltstone
OtherSandstone, dolomite, limestone conglomerate[2]
Location
CountryUnited States
ExtentIllinois, 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.