| Gallatin Formation | |
|---|---|
| Stratigraphic range: Cambrian | |
 Gallatin Formation with fault on the south side of the Big Horn Mountains | |
| Type | Formation |
| Underlies | Bighorn Dolomite |
| Overlies | Gros Ventre Formation |
| Thickness | 180-300 feet |
| Lithology | |
| Primary | Limestone |
| Location | |
| Region | Wyoming, Montana |
| Country | United States |
The Gallatin Formation is a geologic formation in Wyoming and Montana. It preserves fossils dating back to the Cambrian period.