33.9 - 27.3 Ma

The definition of this interval in the timescale International Chronostratigraphic Timescale is taken from the following source:

• K. M. Cohen, S.C. Finney, P.L. Gibbard and J.-X. Fan. 2024. The ICS International Chronostratigraphic Chart v2024/12. International Commission on Stratigraphy view

There are intervals in 9 timescales which overlap this one. show

• International Chronostratigraphic Timescale: Oligocene epoch
• Cenozoic Subepochs: Early Oligocene subepoch
• Mammal Paleogene Zones: MP 24 zone, MP 21 zone, MP 22 zone, MP 23 zone
• Paleogene Mammal Ages of Asia: Hsandagolian age, Kekeamuan age
• North American Land Mammal Ages: Arikareean age, Orellan age, Whitneyan age
• North American Mammal Subages/Zones: early Late Arikareean subage, late Late Arikareean subage, late Early Arikareean subage, Geringian subage, early Early Arikareean subage
• South American Land Mammal Ages: Deseadan age, Tinguirirican age
• Calcareous Nannoplankton Zones: NP21 zone, NP23 zone, NP22 zone
• Cretaceous-Cenozoic of New Zealand: Landon epoch, Whaingaroan age

This interval is used in the definition of 946 collections

A total of 2853 collections with 23095 occurrences lie within this time span