| Amsden Formation | |
|---|---|
| Stratigraphic range: Carboniferous | |
| Type | Formation |
| Location | |
| Region | Montana |
| Country | United States |
The Amsden Formation is a geologic formation in Montana. It preserves fossils dating back to the Carboniferous period.
The Eagle Sandstone, originally the Eagle Formation, is a geological formation in Montana whose strata date back to the Late Cretaceous. It is a light to brownish gray to pale yellow-orange, fine-grained sandstone. It contains areas of crossbedding and local shale members. It contains large sandy calcareous concretions. Its thickness varies from 100 to 350 feet due to the lens nature of the individual sandstone layers and local interbedded sandy shale layers.
The Sappington Formation is a geologic formation in Montana. It preserves fossils dating back to the Carboniferous period.
The Cameron Creek Formation is a geologic formation in Montana. It preserves fossils dating back to the Carboniferous 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 Cook Ranch Formation is a geologic formation in Montana. It preserves fossils dating back to the Paleogene period.
The Dunbar Creek Formation is a geologic formation in Montana. It preserves fossils dating back to the Paleogene period.
The Melville Formation is a geologic formation in Montana. It preserves fossils dating back to the Paleogene period.
The Passamari 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 Toston 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 the western United States. It preserves fossils dating back to the Triassic period.
The Thaynes Formation is a geologic formation in Montana and Idaho, United States. It was recently elevated to group status, as the Thaynes Group.
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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