Earth:Uintan
The Uintan North American Stage is the North American faunal stage, typically set from 46,3 to 40,1 million years before present.[1] The Uintan Stage is a key part of the North American Land Mammal Age. In the Uinta Basin, a thriving subtropical ecosystem was formed at around 46.0 million years ago. It falls within the Eocene epoch, preceded by the Bridgerian and followed by the Duchesnean NALMA stages.[2] The Uinta Formation is a key piece of this geologic stage. Mammalian sabretooths evolved and became dominant predators in the now-Western United States. These included Apataelurus, Diegoaelurus, and Machaeroides.[3][4]
Substages
The Uintan is considered to be contained within the Lutetian sharing the upper boundary and contains the following substages:
- Late/Upper Uintan: Lower boundary source of the base of the Uintan (approximate).
- Early/Lower Uintan: Upper boundary source of the base of the Duchesnean (approximate)
References
- ↑ Hodnett, John-Paul M.; Welsh, Edward T.; Santucci, Vincent L.; Tweet, Justin S. (2022). "A Middle Eocene brontothere (Mammalia; Perissodactyla; Brontotheriidae) from Yellowstone National Park, Wyoming" (in en). FOSSIL RECORD 8. New Mexico Museum of Natural History and Science. pp. 211. https://books.google.com/books?id=YCKIEAAAQBAJ.
- ↑ "GeoWhen Database - Uintan". https://timescalefoundation.org/resources/geowhen/stages/Uintan.html.
- ↑ Zack, Shawn P. (2019-11-22). "The first North American Propterodon (Hyaenodonta: Hyaenodontidae), a new species from the late Uintan of Utah" (in en). PeerJ 7. doi:10.7717/peerj.8136. ISSN 2167-8359. PMC 6876642. https://peerj.com/articles/8136.
- ↑ County~tom@tskelly.gardnerville.nv.us, Thomas S. Kelly~Natural History Museum of Los Angeles; History~pmurphey@sdnhm.org, Paul C. Murphey~San Diego Museum of Natural (2016-07-14). "Mammals from the earliest Uintan (middle Eocene) Turtle Bluff Member, Bridger Formation, southwestern Wyoming, Part 1: Primates and Rodentia" (in en). Palaeontologia Electronica. doi:10.26879/586. https://palaeo-electronica.org/content/2016/1518-earliest-uintan-mammals. Retrieved 2025-06-01.
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