Runningwater Formation
Stratigraphic range: Early Miocene ( Hemingfordian) ~20.6–16.3  Ma PreꞒ Ꞓ O S D C P T J K Pg N ↓
Type	Formation
Lithology
Primary	Sandstone
Other	Conglomerate
Location
Coordinates	42°24′N 103°00′W / 42.4°N 103.0°W / 42.4; -103.0
Approximate paleocoordinates	43°06′N 99°06′W / 43.1°N 99.1°W / 43.1; -99.1
Region	Nebraska
Country	United States
Runningwater Formation (the United States) Show map of the United States Runningwater Formation (Nebraska) Show map of Nebraska

The Runningwater Formation is a geologic formation in Nebraska. It preserves fossils dating back to the Hemingfordian of the Early Miocene of the Neogene period. The sandstones and conglomerates of the formation were deposited in a fluvial environment. The formation has provided many fossil mammals.

Fossil content

Among the following fossils have been found in the formation: ^[1]

Mammals

Reptiles

• Macrochelys schmidti
• Rhineura marslandensis
• Sceloporus sp.

See also

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

References

Bibliography

• Hunt Jr, Robert M., and Daniel A. Yatkola. 2020. A new species of the amphicyonid carnivore Cynelos Jourdan, 1862 from the early Miocene of North America. Geodiversitas 42(5). 57–67. . doi: 10.5252/geodiversitas2020v42a5