| Harrison Formation | |
|---|---|
| Stratigraphic range: Miocene | |
 | |
| Type | Formation |
| Location | |
| Region | South Dakota, Wyoming, Nebraska |
| Country | United States |
The Harrison Formation is a geologic group in South Dakota and Nebraska. It preserves fossils from the Miocene.
| Harrison Formation | |
|---|---|
| Stratigraphic range: Miocene | |
| | |
| Type | Formation |
| Location | |
| Region | South Dakota, Wyoming, Nebraska |
| Country | United States |
The Harrison Formation is a geologic group in South Dakota and Nebraska. It preserves fossils from the Miocene.
Proscalops is an extinct genus of insect-eating mammal. Formerly placed in the defunct order Insectivora, it is now placed with the Eulipotyphla. The first and most numerous Proscalops fossils were found in the Sharps Formation of South Dakota, near Wounded Knee. Other samples have been found in the Brule Formation of South Dakota, the Deep River Formation of Montana, and in Wyoming.
The Cannonball Formation is a geologic formation in western North Dakota. It preserves fossils dating back to the Paleogene Period.
The Ludlow Formation is a geologic formation in western North Dakota. It preserves fossils dating back to the Paleogene Period.
The Tongue River Member is the uppermost geologic member of the Fort Union Formation in Montana, North Dakota, Wyoming. The strata are yellow or light-colored massive sandstones and numerous thick coal beds.
The Deadwood Formation is a geologic formation of the Williston Basin and Western Canada Sedimentary Basin. It is present in parts of North and South Dakota and Montana in the United States, and in parts of Alberta, Saskatchewan, and southwestern corner of Manitoba in Canada. It is of Late Cambrian to Early Ordovician age and was named for exposures in Whitewood Creek near Deadwood, South Dakota. It is a significant aquifer in some areas, and its conglomerates yielded significant quantities of gold in the Black Hills of South Dakota.
The Montana Group is a geologic group in South Dakota. It preserves fossils dating back to the Cretaceous period.
The Minnelusa Formation is a geologic formation in South Dakota. It preserves fossils dating back to the Carboniferous period.
The Batesland Formation is a geologic formation in South Dakota. It preserves fossils dating back to the Neogene period.
The Thin Elk Formation is a geologic formation in South Dakota. It preserves fossils dating back to the Neogene period.
The Whitewood Limestone is a geologic formation in South Dakota. It preserves fossils dating back to the Ordovician period.
The Turtle Butte Formation is a geologic formation at Turtle Butte in South Dakota. It preserves fossils dating back to the Paleogene period.
The Monroe Creek Formation is a geologic formation in South Dakota. It preserves fossils dating back to the Paleogene period.
The Sharps Formation is a geologic formation in South Dakota. It preserves fossils dating back to the Paleogene.
The Slim Buttes Formation is a geologic formation in South Dakota. It preserves fossils dating back to the Paleogene period.
The Bon Homme Gravel is a geologic formation in South Dakota. It preserves fossils.
The Fort Randall Formation is a geologic formation in South Dakota, United States. It preserves fossils dating back to the Neogene period.
The Three Forks Shale is a geologic formation in Montana and North Dakota. It preserves fossils dating back to the Devonian period.
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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