Uintan
Template:Infobox geologic timespan The Uintan North American Stage is the North American faunal stage, typically set from 46,200,000 to 42,000,000 years before present lasting 4.2 million years.[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
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- ↑ Paleobiology Database, Uintan
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