Rosebud Formation

The Rosebud Formation is a geologic formation of cemented pink silt in Nebraska and South Dakota, dating to the early middle Miocene epoch of the Neogene period.^[2] Possibly named for its color, no type location has been set for this unit,^[2] but it is associated with the Valentine Formation along the Niobrara River. The fine silt of the formation forms an aquitard beneath the Ogallala Aquifer carried by the Valentine Formation. Many springs from the Valentine sands flow down the Rosebud outcrop into the Niobrara River.^[1]

Rosebud Formation
Stratigraphic range: Miocene PreꞒ Ꞓ O S D C P T J K Pg N
Along the north banks of the Niobrara River in northern Nebraska, the pink of the Rosebud Formation is commonly seen with many seeps, trickles, and waterfalls emitting from the Ogallala Aquifer in the overlying Valentine Formation[1]
Type	Formation
Unit of	Arikaree Group
Underlies	Valentine Formation
Lithology
Primary	pink siltstone
Location
Region	Nebraska, South Dakota
Country	United States

See also

• Earth sciences portal
• Paleontology portal

• Paleontology in Nebraska
• Paleontology in South Dakota
• List of fossiliferous stratigraphic units in Nebraska
• List of fossiliferous stratigraphic units in South Dakota