28.9 - 20.9 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 10 timescales which overlap this one. show

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

This interval is used in the definition of 90 collections

A total of 3370 collections with 26673 occurrences lie within this time span