29.5 - 18.5 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 11 timescales which overlap this one. show

• International Chronostratigraphic Timescale: Burdigalian age, Chattian age, Aquitanian age, Miocene epoch, Rupelian age, Oligocene epoch
• Cenozoic Subepochs: Late Oligocene subepoch, Early Oligocene subepoch, Early Miocene subepoch
• European Faunal Units: Orleanian subage, Agenian subage
• European Faunal Zones: MN 1 zone, MN 3 zone, MN 2 zone
• Mammal Paleogene Zones: MP 22 zone, MP 26 zone, MP 30 zone, MP 23 zone, MP 28 zone, MP 29 zone, MP 25 zone, MP 24 zone, MP 21 zone, MP 27 zone
• Neogene Mammal Ages of China: Xiejiaan age
• Paleogene Mammal Ages of Asia: Kekeamuan age, Tabenbulakian age, Hsandagolian age
• North American Land Mammal Ages: Arikareean age
• North American Mammal Subages/Zones: late Late Arikareean subage, Harrisonian subage, Monroecreekian subage, Geringian subage, late Early Arikareean subage, early Late Arikareean subage
• South American Land Mammal Ages: Colhuehuapian age, Deseadan age, Tinguirirican age
• Cretaceous-Cenozoic of New Zealand: Whaingaroan age, Waitakian age, Duntroonian age, Otaian age, Landon epoch, Pareora epoch, Altonian age

This interval is used in the definition of 7 collections

A total of 5268 collections with 42019 occurrences lie within this time span