20.9 - 17.4 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

The top and bottom ages have been interpolated based on the differences between the ages for international timescale boundaries quoted in the source and the currently accepted ages for those boundaries.

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

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

This interval is used in the definition of 41 collections

A total of 1811 collections with 19799 occurrences lie within this time span