| Ruby River Basin Group | |
|---|---|
| Stratigraphic range: Paleogene | |
| Type | Group |
| Location | |
| Region | Montana |
| Country | United States |
The Ruby River Basin Group is a geologic group in Montana. It preserves fossils dating back to the Paleogene period.
Toxolophosaurus was a sphenodont which lived in North America during the Early Cretaceous.
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 Wolsey Shale is a geologic formation in Montana. It preserves fossils dating back to the Cambrian 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, United States. It preserves fossils dating back to the Carboniferous 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 Ellis Formation is a geologic formation of the Ellis Group in Montana.
The Melville Formation is a geologic formation in Montana. It preserves fossils dating back to the Paleogene 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, United States. 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.
 | This article about a specific stratigraphic formation in Montana is a stub. You can help Wikipedia by expanding it. |
