| Sumner Group | |
| Type: | Group |
| Age: | Lower Permian |
| Period: | Lower Permian |
| Prilithology: | Shale, dolomite |
| Otherlithology: | Salt, anhydrite, mudstone |
| Namedfor: | Sumner County, Kansas |
| Namedby: | F.W. Cragin[1] |
| Year Ts: | 1896 |
| Region: | Kansas |
| Country: | United States |
| Subunits: | Stone Corral Formation, Ninnescah Shale, Wellington Formation |
| Underlies: | Nippewalla Group |
| Overlies: | Chase Group |
The Sumner Group is a sedimentary geologic group of Lower Permian age. It is defined in east-central Kansas and extends into Oklahoma and Nebraska as well as the Colorado subsurface where it is undivided.[2]