| Decatur Limestone | |
|---|---|
| Stratigraphic range: Silurian | |
| Type | Formation | 
| Lithology | |
| Primary | limestone | 
| Location | |
| Region | Mississippi and Tennessee | 
| Country | United States | 
The Decatur Limestone is a geologic formation in Tennessee. It preserves fossils dating back to the Silurian period.