Irvingtonian

From Wikipedia, the free encyclopedia

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 mammals

Artiodactyla - even-toed ungulates

Carnivora - carnivores

Lagomorpha - lagomorphs

Perissodactyla - odd-toed ungulates

Proboscidea

Rodentia - rodents

  • Paenemarmota, giant marmots

Notable birds

Charadriiformes

Falconiformes - diurnal raptors

  • Falco sp., a falcon[5]

Passeriformes

References

  1. ↑ Paleobiology Database, Irvingtonian
  2. ↑ 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
  3. ↑ PaleoBiology Database substages
  4. ↑ 4.0 4.1 Wetmore (1937)
  5. ↑ 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
This article is issued from Wikipedia. The text is available under the Creative Commons Attribution/Share Alike; additional terms may apply for the media files.