| Chase Group | |
| Type: | Group |
| Age: | Lower Permian |
| Period: | Lower Permian |
| Prilithology: | Limestone, shale, mudstone |
| Otherlithology: | Flint, paleosols |
| Namedfor: | Chase County, Kansas |
| Namedby: | C.S. Prosser[1] |
| Year Ts: | 1895 |
| Region: | Kansas with Oklahoma and Nebraska |
| Country: | United States |
| Subunits: | Nolans Limestone Odell Shale Winfield Limestone Doyle Shale Barneston Limestone Matfield Shale Wreford Limestone |
| Underlies: | Sumner Group |
| Overlies: | Council Grove Group |
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]