| Derby-Doerun Dolomite | |
|---|---|
| Stratigraphic range: Upper Cambrian | |
| Type | Formation |
| Unit of | Elvins Group |
| Underlies | Potosi Dolomite |
| Overlies | Davis Formation[1] |
| Lithology | |
| Primary | Dolomite |
| Location | |
| Region | St. Francois County, Missouri |
| Country | United 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.[1] The combined name is from the Derby Mine and the Doe Run Lead Company of the Old Lead Belt.[1]