| Keokuk Limestone | |
| Type: | Formation |
| Age: | Mississippian |
| Period: | Mississippian |
| Prilithology: | Limestone |
| Namedfor: | Keokuk in southeastern Iowa |
| Region: | Illinois, Iowa, Missouri |
| Country: | United States |
| Underlies: | Warsaw Formation |
| Overlies: | Burlington Limestone[1] |
The Keokuk Limestone is a geologic formation in Illinois, Iowa and Missouri. It preserves fossils dating back to the Mississippian sub-period.