41.2 - 37.71 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. 2023. The ICS International Chronostratigraphic Chart v2023/09. view

There are intervals in 8 timescales which overlap this one. show

• International Chronostratigraphic Timescale: Eocene epoch
• Cenozoic Subepochs: Middle Eocene subepoch
• Mammal Paleogene Zones: MP 16 zone
• Paleogene Mammal Ages of Asia: Arshantan age, Sharamurunian age, Irdinmanhan age
• North American Land Mammal Ages: Uintan age, Duchesnean age
• North American Mammal Subages/Zones: Late Uintan subage, Early Uintan subage
• South American Land Mammal Ages: Divisaderan age
• Cretaceous-Cenozoic of New Zealand: Arnold epoch, Bortonian age, Kaiatan age

This interval is used in the definition of 1845 collections

A total of 1677 collections with 20701 occurrences lie within this time span