Runningwater Formation

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′N103°00′W / 42.4°N 103.0°W / 42.4; -103.0
Approximate paleocoordinates	43°06′N99°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

• Aletomeryx gracilis
• Arretotherium fricki
• Barbouromeryx trigonocorneus
• Cynarctoides acridens
• Cynelos stenos ^[2]
• Diceratherium niobrarense
• Daphoenodon (Borocyon) robustum
• Desmocyon thomsoni
• Hypertragulus minor
• Menoceras barbouri
• Merychyus arenarum , M. elegans
• Metatomarctus canavus
• Osbornodon iamonensis
• Pseudoblastomeryx advena
• Anchitheriomys stouti
• Desmatippus tyleri
• Edaphocyon lautus
• Amphicyon galushai
• Craterogale cf. simus
• Leptarctus cf. ancipidens
• Leptocyon vulpinus
• Tephrocyon scitulus
• Merycochoerus proprius

Reptiles

• Macrochelys schmidti
• Rhineura marslandensis
• Sceloporus sp.

See also

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

References

1. Runningwater Formation at Fossilworks.org
2. Hunt & Yatkola, 2020

Bibliography

• Hunt Jr, Robert M.; Yatkola, Daniel A. (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