| Wolsey Shale | |
|---|---|
| Stratigraphic range: Cambrian | |
 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.
The Montana Group is a geologic group in South Dakota. It preserves fossils dating back to the Cretaceous period.
The Snowy Range Formation is a geologic formation in Montana. It preserves fossils dating back to the Cambrian period.
The Allan Mountain Limestone is a geologic formation in Montana. It preserves fossils dating back to the Carboniferous period.
The Sappington Formation is a geologic formation in Montana. It preserves fossils dating back to the Carboniferous period.
The Amsden Formation is a geologic formation in Montana. It preserves fossils dating back to the Carboniferous period.
The Lodgepole Limestone is a geologic formation in Montana. It preserves fossils dating back to the Carboniferous period.
The Marias River Shale is a geologic formation in Montana. It preserves fossils dating back to the Cretaceous period.
The Montana Formation is a geologic formation in Montana. It preserves fossils dating back to the Cretaceous period.
The Shell Creek Shale is a geologic formation in Montana. It preserves fossils dating back to the Cretaceous period.
The Jefferson Formation is a geologic formation in Montana. It preserves fossils dating back to the Devonian period.
The Three Forks Shale is a geologic formation in Montana and North Dakota. It preserves fossils dating back to the Devonian period.
The Deep River Formation is a geologic formation in Montana. It preserves fossils dating back to the Neogene period.
The Polecat Bench Formation is a geologic formation in Montana. It preserves fossils dating back to the Paleogene period. The polyglyphanodontian lizard Chamops is known from this formation.
The Renova Formation is a geologic formation in Montana. It preserves fossils dating back to the Paleogene period.
The Tullock Formation is a geologic formation in Montana. It preserves fossils dating back to the Paleogene period.
The Park City Formation is a geologic formation in Montana and Utah. It preserves fossils dating back to the Permian period.
The Dinwoody Formation is a geologic formation in Montana. It preserves fossils dating back to the Triassic period.
The Thaynes Formation is a geologic formation in Montana and Idaho. It preserves fossils dating back to the Triassic period, such as Ammonoidea, Actinopterygii, Actinistia, Conodonta, Gastropoda, Nautiloidea, Ichthyosauria and others. A diverse fauna known as the Paris Biota has been described from the Thaynes Formation.
The Belle Fourche Formation or Belle Fourche Shale is a fossiliferous early Late-Cretaceous geologic formation classification in Wyoming. Named for outcrops in Belle Fourche River, Wyoming, this unit name is also used in Montana, North Dakota, and South Dakota.
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