Runningwater Formation
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.
| Runningwater Formation Stratigraphic range: Early Miocene (Hemingfordian) ~20.6–16.3 Ma | |
|---|---|
| Type | Formation |
| Lithology | |
| Primary | Sandstone |
| Other | Conglomerate |
| Location | |
| Coordinates | 42.4°N 103.0°W |
| Approximate paleocoordinates | 43.1°N 99.1°W |
| Region | Nebraska |
| Country |  |
  Runningwater Formation (the United States)  Runningwater Formation (Nebraska) | |
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
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References
- Runningwater Formation at Fossilworks.org
- Hunt & Yatkola, 2020
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. 57–67. doi:10.5252/geodiversitas2020v42a5
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