Tiffanian
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The Tiffanian North American Stage on the geologic timescale is the North American faunal stage according to the North American Land Mammal Ages chronology (NALMA), typically set from 60,200,000 to 56,800,000 years BP lasting 3.4 million years.[1]
It is usually considered to overlap the Selandian and Thanetian within the Paleocene.
The Tiffanian is preceded by the Torrejonian and followed by the Clarkforkian NALMA stages.
Substages[edit]
The Tiffanian is considered to contain the following substages:
- Ti6: Lower boundary source of the base of the Tiffanian (approximate).
- Ti5 Lower boundary source of the base of the Tiffanian (approximate) and upper boundary source of the base of the Clarkforkian (approximate).
- Ti4: Lower boundary source of the base of the Tiffanian (approximate) and upper boundary source of the base of the Clarkforkian (approximate).
- Ti3: Lower boundary source of the base of the Tiffanian (approximate) and upper boundary source of the base of the Clarkforkian (approximate).
- Ti2: Lower boundary source of the base of the Tiffanian (approximate) and upper boundary source of the base of the Clarkforkian (approximate).
- Ti1: Upper boundary source of the base of the Clarkforkian (approximate)
Fauna[edit]
Notable mammals[2][3][4][edit]
Multituberculata - non-therian mammals
- Neoplagiaulax, neoplagiaulacid multituberculate
- Ptilodus, squirrel-sized ptilodontid
Metatheria - marsupials
- Peradectes, peradectid marsupial
Apatotheria - primitive, arboreal mammals
- Labidolemur, aye-aye-like arboreal mammal
Condylarthra - archaic ungulates
- Claenodon, large, arctocyonid condylarth
- Ectocion, phenacodontid condylarth
- Lambertocyon, arctocyonid condylarth
- Phenacodus, phenacodontid condylarth
- Thryptacodon, raccoon-like arctocyonid condylarth
Dinocerata - large, tusked herbivores
- Probathyopsis, early North American uintathere
Eulipotyphla - insectivorous mammals
- Adunator, erinaceomorph insectivore
- Leptacodon, nyctitheriid insectivore
- Litocherus, erinaceomorph insectivore
Primatomorpha - primates and relatives
- Carpodaptes, carpolestid plesiadapiform
- Carpolestes, carpolestid plesiadapiform
- Chiromyoides, small plesiadapid
- Ignacius, paramomyid plesiadapiform
- Nannodectes, basal plesiadapid
- Phenacolemur, paramomyid plesiadapiform
- Plesiadapis, plesiadapid plesiadapiform
Proteutheria - basal eutherians
- Palaeoryctes, small insectivorous mammal
References[edit]
- ^ Paleobiology Database, Tiffanian
- ^ Secord, Ross (2008). "The Tiffanian Land-Mammal Age (Middle and Late Paleocene) In The Northern Bighorn Basin, Wyoming". Papers on Paleontology. No. 35. hdl:2027.42/61362.
- ^ Gunnell, Gregg F. (1994-03-31). "Paleocene mammals and faunal analysis of the Chappo Type Locality (Tiffanian), Green River Basin, Wyoming". Journal of Vertebrate Paleontology. 14 (1): 81–104. doi:10.1080/02724634.1994.10011540. ISSN 0272-4634.
- ^ Gazin, Charles Lewis (1956). "Paleocene mammalian faunas of the Bison Basin in south-central Wyoming". Smithsonian Miscellaneous Collections. 131: 1–57.