| Wolsey Shale | |
| Type: | Formation |
| Age: | Cambrian |
| Region: | Montana |
| Country: | United States |
| Unitof: | Gros Ventre Formation |
| Underlies: | Death Canyon Limestone |
| Overlies: | Flathead Sandstone |
The Wolsey Shale is a geologic formation in Montana. It preserves fossils dating back to the Cambrian period.