Puercan

The Puercan North American Stage on the geologic timescale is the North American faunal stage according to the North American Land Mammal Ages chronology (NALMA), spanning the interval from 66,000,000 to 63,300,000 years BP lasting 2.7 million years.[1]

It is usually considered to be within the Paleocene.

The Puercan directly follows the Lancian NALMA, with the K-Pg boundary and K-Pg mass extinction at 66 MYA representing the boundary between the two. The Puercan is followed by the Torrejonian NALMA stage.

Puercan age fossils, from the Great Divide Basin, Wyoming, include three newly identified condylarth members of the Periptychidae; Miniconus jeanninae, Conacodon hettingeri, Beornus honeyi [2]

Substages

The Puercan is considered to contain the following substages:

  • Pu3: Lower boundary(?) source of the base of the Puercan (approximate).
  • Pu2: Lower boundary source of the base of Puercan (approximate) and upper boundary source of the base of the Torrejonian (approximate).
  • Pu1: Lower boundary source of the base of the Puercan (approximate) and upper boundary source of the base of the Torrejonian (approximate).

References

  1. ^ Paleobiology Database, Puercan
  2. ^ "Three New Species of Primitive Ungulate Ancestors Identified | Paleontology | Sci-News.com". Breaking Science News | Sci-News.com. Retrieved 2021-08-19.


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