| 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 Tongue River Member is a geologic member of the Fort Union Formation in North Dakota and Wyoming. It preserves fossils dating back to the Paleogene period.
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 Ash Hollow Formation of the Ogallala Group is a geological formation found in Nebraska and South Dakota. It preserves fossils dating back to the Neogene period. It was named after Ash Hollow, Nebraska and can be seen in Ash Hollow State Historical Park.
The Batesland Formation is a geologic formation in South Dakota. It preserves fossils dating back to the Neogene period.
The Rosebud 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 period.
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 Rosebud Beds 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 Benton Shale is a geologic formation in Montana, Wyoming, North Dakota, South Dakota, Colorado, Kansas, and Nebraska. It preserves fossils dating to the Cretaceous Period. The term Benton Limestone has also been used to refer to the chalky portions of the strata, especially the upper beds of the strata presently classified as Greenhorn Limestone. The Benton classification is obsolete in some regions, having been replaced by the ascending sequence Graneros Shale, Greenhorn Limestone, and Carlile Shale.
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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