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Title: Irvingtonian  
Author: World Heritage Encyclopedia
Language: English
Subject: North American land mammal age, Montane vole, American mink, Anza-Borrego Desert State Park, Pleistocene
Publisher: World Heritage 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] 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]



  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. ^ a b Wetmore (1937)
  5. ^ Feduccia (1970)
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