50.5 - 46.2 Ma

The definition of this interval in the timescale North American Mammal Subages/Zones is taken from the following source:

• M. O. Woodburne. 1987. A prospectus of the North American Mammal Ages. In: Woodburne, M. O. (ed.), Cenozoic Mammals of North America. University of California Press, Berkelery, CA 285-290 view

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

• International Chronostratigraphic Timescale: Lutetian age, Eocene epoch, Ypresian age
• Cenozoic Subepochs: Early Eocene subepoch, Middle Eocene subepoch
• Mammal Paleogene Zones: MP 7 zone, MP 11 zone, MP 14 zone, MP 15 zone, MP 12 zone, MP 13 zone, MP 10 zone, MP 8 + 9 zone
• Paleogene Mammal Ages of Asia: Sharamurunian age, Bumbanian age, Irdinmanhan age, Arshantan age
• North American Land Mammal Ages: Bridgerian age
• North American Mammal Subages/Zones: Twinbuttean subage, Blacksforkian subage
• South American Land Mammal Ages: Casamayoran age, Mustersan age
• Cretaceous-Cenozoic of New Zealand: Dannevirke epoch, Mangaorapan age, Heretaungan age

This interval is used in the definition of 0 collections

A total of 693 collections with 3750 occurrences lie within this time span