Washakie Formation
The Washakie Formation is a geologic formation in northern Colorado and southern Wyoming. It preserves many mammal, bird, reptile and other fossils dating back to the Lutetian stage of the Eocene within the Paleogene period. The sediments fall in the Bridgerian and Uintan stages of the NALMA classification.[1]
| Washakie Formation Stratigraphic range: Lutetian (Bridgerian-Uintan ~48–42 Ma | |
|---|---|
| Type | Formation |
| Sub-units | Adobe Town & Kinney Rim members |
| Lithology | |
| Primary | Sandstone |
| Location | |
| Coordinates | 41.7°N 109.0°W |
| Approximate paleocoordinates | 45.6°N 95.1°W |
| Region | Colorado & Wyoming |
| Country |  United States |
| Extent | Sand Wash & Washakie Basins |
  Washakie Formation (the United States)  Washakie Formation (Wyoming) | |
Fossil content
The Washakie Formation has provided many fossil mammals, turtles and other reptiles, birds and other fossils.[1]
The artiodactyl Heliosus apophis was described from the formation by Burger and Jolley,[2] and the rodents Pareumys flynni, Pauromys turnbulli and Thisbemys intermedius by Korth in 2020.[3][4]
See also
References
- Washakie Formation at Fossilworks.org
- Burger & Jolley, 2020, p.178
- Korth, 2020a
- Korth, 2020b
Bibliography
- Burger, B.J., and L.A. Jolley. 2020. A new large body helohyid (Artiodactyla) from the Bridgerian Middle Eocene Washakie Formation of southern Wyoming. Paludicola 12. 175-184. Accessed 2020-06-28.
- Korth, William W. 2020a. New material of fossil rodents (Mammalia) from the Eocene (Bridgerian-Uintan) Washakie Formation, southcentral Wyoming. Proceedings of the Biological Society of Washington 133. 18–34. doi:10.2988/19-00011
- Korth, William W. 2020b. The Eocene ischyromyid rodent Thisbemys from the Washakie Formation, Wyoming (early Eocene, late Bridgerian) with comments on the systematics of the genus. Journal of Paleontology Online edition. x. doi:10.1017/jpa.2020.37
Further reading
- W. G. Joyce, V. S. Volpato, and Y. Rollot. 2018. The skull of the carettochelyid turtle Anosteira pulchra from the Eocene (Uintan) of Wyoming and the carotid canal system of carettochelyid turtles. Fossil Record 21:301-310
- N. Vitek. 2011. Insights into the Taxonomy and Systematics of North American Eocene Soft-Shelled Turtles from a Well-Preserved Specimen. Bulletin of the Peabody Museum of Natural History 52(2):189-208
- S. M. McCarroll, J. J. Flynn, and W. D. Turnbull. 1996. Biostratigraphy and magnetostratigraphy of the Bridgerian-Uintan Washakie Formation, Washakie Basin, Wyoming. In D. R. Prothero and R. J. Emry (eds.), The Terrestrial Eocene-Oligocene Transition in North America 25-39
- R. K. Stucky, D. R. Prothero, W. G. Lohr and J. R. Snyder. 1996. Magnetic stratigraphy, sedimentology, and mammalian faunas of the early Uintan Washakie Formation, Sand Wash Basin, northwestern Colorado. In D. R. Prothero and R. J. Emry (eds.), The Terrestrial Eocene-Oligocene Transition in North America 40-51
- S. M. McCarroll, J. J. Flynn, and W. D. Turnbull. 1996. The Mammalian Faunas of the Washakie Formation, Eocene Age, of Southern Wyoming. Part III. The Perissodactyls. Fieldiana, Geology 33:1-38
- A. Wetmore. 1944. A new terrestrial vulture from the Upper Eocene deposits of Wyoming. Annals of Carnegie Museum 30:57-69
- R. Zangerl. 1944. Brachyuranochampsa eversolei, gen. et sp. nov., a new crocodilian from the Washakie beds of Wyoming. Annals of Carnegie Museum 30:77-84
- O. P. Hay. 1908. The fossil turtles of North America. Carnegie Institution of Washington Publication 75:1-568
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