21 - 17.5 Ma

The definition of this interval in the timescale South American Land Mammal Ages is taken from the following source:

• J. J. Flynn and C. C. Swisher, III. 1995. Cenozoic South American Land Mammal Ages: correlation to global geochronology. Geochronology Time Scales and Global Stratigraphic Correlation, SEPM Special Publication 54:317-333 view

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

• International Chronostratigraphic Timescale: Burdigalian age, Aquitanian age, Miocene epoch
• Cenozoic Subepochs: Early Miocene subepoch
• European Faunal Units: Orleanian subage, Agenian subage
• European Faunal Zones: MN 3 zone, MN 2 zone
• Neogene Mammal Ages of China: Xiejiaan age
• North American Land Mammal Ages: Hemingfordian age, Arikareean age
• North American Mammal Subages/Zones: late Early Arikareean subage, early Late Arikareean subage, early Early Arikareean subage, Harrisonian subage, late Late Arikareean subage, Late Hemingfordian subage, Early Hemingfordian subage
• Calcareous Nannoplankton Zones: NN4 zone, NN2 zone, NN3 zone
• Cretaceous-Cenozoic of New Zealand: Altonian age, Pareora epoch, Otaian age

This interval is used in the definition of 41 collections

A total of 1487 collections with 17669 occurrences lie within this time span