| Janesville Shale | |
| Type: | Formation |
| Age: | Late Carboniferous (Virgilian) |
| Prilithology: | Shale |
| Otherlithology: | Limestone |
| Namedfor: | Janesville Township of Greenwood County, Kansas |
| Region: | Kansas, Oklahoma, Nebraska |
| Country: | United States |
| Unitof: | Admire Group |
| Subunits: | Five Point Limestone, Hamlin Shale, West Branch Shale |
The Janesville Shale or Janesville Formation is a geologic formation in Kansas, Oklahoma, and Nebraska dating to the late Carboniferous period.[1]