Clarkforkian
The Clarkforkian North American Stage, on the geologic timescale, is the North American faunal stage according to the North American Land Mammal Ages chronology, typically set from 56,800,000 to 55,400,000 years BP lasting.
Considered to be within the Paleocene, more specifically the Late Paleocene, the Clarkforkian shares its upper boundary with the Thanetian.
The Clarkforkian is preceded by the Tiffanian and followed by the Wasatchian NALMA stages.Substages
It is considered to contain the following substages:
- Cf3: and lower boundary source of the base of Clarkforkian and upper boundary source of the base of the Ypresian.
- Cf2: Is the lower boundary source of the base of the Clarkforkian
- Cf1: Upper boundary source of the base of the Ypresian
Fauna
Notable mammals
Multituberculata - non-therian mammals
Metatheria - marsupials
- Peradectes, peradectid marsupial
Carnivora - carnivores, including living carnivorous mammals
Condylarthra - archaic ungulates
Creodonta - extinct group of carnivorous mammals
- Oxyaena, semi-arboreal creodont
Dinocerata - large, tusked herbivores
Eulipotyphla - insectivorous mammals
- Plagioctenodon, nyctitheriid insectivore
- Wyonycteris, nyctitheriid insectivore
Mesonychia - carnivorous hoofed mammals
Pantodonta - large herbivorous mammals
Primatomopha - primates and relatives
Rodentia - rodents
- Alagomys, alagomyid rodent
- Paramys, ischyromyid rodent
Tillodontia - medium sized, digging herbivores
- Esthonyx, esthonychid tillodont
