| Sumner Group | |
|---|---|
| Stratigraphic range: Lower Permian | |
| Type | Group |
| Sub-units | Stone Corral Formation, Ninnescah Shale, Wellington Formation |
| Underlies | Nippewalla Group |
| Overlies | Chase Group |
| Lithology | |
| Primary | Shale, dolomite |
| Other | Salt, anhydrite, mudstone |
| Location | |
| Region | Kansas |
| Country | United States |
| Type section | |
| Named for | Sumner County, Kansas[1] |
| Named by | F.W. Cragin[1] |
| Year defined | 1896 |
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]
- ^ a b Cragin, F.W., 1896, The Permian system in Kansas: Colorado College Studies, v. 6, p. 1-48.
- ^ "Geologic Unit: Sumner". National Geologic Database. Geolex — Significant Publications. United States Geological Survey. Retrieved 2021-11-28.