Irvingtonian
The Irvingtonian North American Land Mammal Age on the
NALMA
stages.
The Irvingtonian can be further divided into substages:
- Irvingtonian I - approximately 1.9 MA TO 0.85 MA
- Irvingtonian II - approximately 0.85 MA TO 0.4 MA
- Irvingtonian III - approximately 0.4 MA TO 0.25 MA[1]
The beginning of the Irvingtonian is defined by the first appearance of Mammuthus south of 55° N in North America, and the beginning of the succeeding Rancholabrean is defined by the first appearance of Bison.[4]
In South America, it chronologically overlaps with the Uquian (partial), Ensenadan, and Lujanian in South American Land Mammal Ages.
Fauna
Notable mammals
Carnivora - carnivores
Lagomorpha - lagomorphs
Perissodactyla - odd-toed ungulates Proboscidea - elephants
Rodentia - rodents
|
Notable birds
Falconiformes - diurnal raptors
|
References
- ^ a b The _Blancan, Irvingtonian and Rancholabrean Mammal Ages by Christopher J. Bell and Ernest L. Lundelius Jr., Anthony D. Barnosky, Russell W. Graham, Everett H. Lindsay, Dennis R. Ruez Jr., Holmes A. Semken Jr., S. David Webb, and Richard J. Zakrzewski. January 2004 in the book: Late Cretaceous and Cenozoic Mammals of North America: Biostratigraphy and Geochronology. Chapter: 7. Publisher: Columbia University Press; Editors: Michael O. Woodburne. pp274-276
- ISSN 0094-8373.
- ^ Savage, D.E. (1951) Late Cenozoic vertebrates of the San Francisco Bay region, University of California Publications, Bulletin of the Department of Geological Sciences 28:215-314
- ^ "Irvingtonian North American Land Mammal Age". Florida Museum. 2017-03-28. Retrieved 2020-04-24.
- ^ a b Wetmore (1937)
- ^ Feduccia (1970)