| Wolsey Shale | |
|---|---|
| Stratigraphic range: Cambrian | |
.jpg) Fossils from the Wolsey Shale | |
| Type | Formation |
| Unit of | Gros Ventre Formation |
| Underlies | Death Canyon Limestone |
| Overlies | Flathead Sandstone |
| Location | |
| Region | Montana |
| Country | United States |
The Wolsey Shale is a geologic formation in Montana. It preserves fossils dating back to the Cambrian period.