| Chase Group | |
|---|---|
| Stratigraphic range: Lower Permian | |
| Type | Group |
| Sub-units | Nolans Limestone Odell Shale Winfield Limestone Doyle Shale Barneston Limestone Matfield Shale Wreford Limestone |
| Underlies | Sumner Group |
| Overlies | Council Grove Group |
| Lithology | |
| Primary | Limestone, shale, mudstone |
| Other | Flint, paleosols |
| Location | |
| Region | Kansas with Oklahoma and Nebraska |
| Country | United States |
| Type section | |
| Named for | Chase County, Kansas[1] |
| Named by | C.S. Prosser[1] |
| Year defined | 1895 |
The Chase Group is a sedimentary rock unit 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. The unit was assigned geologic group rank around 1902.[2]