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The Irvingtonian 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 1,800,000 to 300,000 years BP[1]. It 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)[2]

ReferencesEdit


Neogene period
Miocene
Pliocene
Pleistocene
Holocene
Aquitanian | Burdigalian
Langhian | Serravallian
Tortonian | Messinian
Zanclean | Piacenzian
(Gelasian)
Gelasian | Early
Middle | Late
Boreal | Atlantic
Neogene period
Quaternary
Pliocene
Pleistocene
Holocene
← Neogene | Gelasian Early | Middle | Late  

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