Derby-Doerun Dolomite

Derby-Doerun Dolomite
Stratigraphic range: Upper Cambrian
TypeFormation
Unit ofElvins Group
UnderliesPotosi Dolomite
OverliesDavis Formation
Lithology
PrimaryDolomite
Location
RegionSt. Francois County, Missouri
CountryUnited States

The Derby-Doerun Dolomite is a Cambrian geologic formation exposed in southeast Missouri. Originally the Derby and Doerun were originally considered separate formations, but now considered a single unit. The combined name is from the Derby Mine and the Doe Run Lead Company of the Old Lead Belt.