Irvingtonian
The Irvingtonian North American Land Mammal Age on the geologic timescale is the North American faunal stage according to the North American Land Mammal Ages chronology (NALMA), typically set from 1,800,000 to 240,000 years BP, a period of 1.56 million years.[1] Named after an assemblage of fossils from the Irvington district of Fremont, California,[2] the Irvingtonian is usually considered to overlap the Lower Pleistocene and Middle Pleistocene epochs. The Irvingtonian is preceded by the Blancan and followed by the Rancholabrean NALMA stages.
The Irvingtonian can be further divided into the substages of:
- Cudahyan: Lower boundary source: base of Irvingtonian (approximate)
- Sappan: Upper boundary source: base of Rancholabrean (approximate)[3]
Fauna
Notable mammalsArtiodactyla - even-toed ungulates
Carnivora - carnivores
Lagomorpha - lagomorphs
Perissodactyla - odd-toed ungulates
Rodentia - rodents
|
Notable birdsFalconiformes - diurnal raptors
Passeriformes |
References
- ↑ Paleobiology Database, Irvingtonian
- ↑ 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
- ↑ PaleoBiology Database substages
- ↑ 4.0 4.1 Wetmore (1937)
- ↑ Feduccia (1970)
| Neogene Period | |||
|---|---|---|---|
| Miocene | Pliocene | ||
| Aquitanian |Burdigalian Langhian | Serravallian Tortonian | Messinian |
Zanclean | Piacenzian | ||
| Quaternary | ||
|---|---|---|
| Pleistocene | Holocene | |
| Early | Middle | Late | Preboreal | Boreal | Atlantic | Subboreal | Subatlantic | |