20.45 - 15.98 Ma

The definition of this interval in the timescale International Chronostratigraphic Timescale is taken from the following source:

• K. M. Cohen, S.C. Finney, P.L. Gibbard and J.-X. Fan. 2024. The ICS International Chronostratigraphic Chart v2024/12. International Commission on Stratigraphy view

There are intervals in 13 timescales which overlap this one. show

• International Chronostratigraphic Timescale: Miocene epoch
• Cenozoic Subepochs: Early Miocene subepoch
• European Faunal Units: Agenian subage, Orleanian subage
• European Faunal Zones: MN 2 zone, MN 3 zone, MN 4 zone
• Neogene Mammal Ages of China: Shanwangian age, Xiejiaan age
• North American Land Mammal Ages: Barstovian age, Arikareean age, Hemingfordian age
• North American Mammal Subages/Zones: Late Hemingfordian subage, early Late Barstovian subage, late Late Barstovian subage, late Late Arikareean subage, late Early Arikareean subage, Harrisonian subage, Early Hemingfordian subage, Early Barstovian subage, early Early Arikareean subage, early Late Arikareean subage
• South American Land Mammal Ages: Friasian age, Santacrucian age, Colhuehuapian age
• Calcareous Nannoplankton Zones: NN3 zone, NN4 zone, NN2 zone
• Planktic Foraminiferal Zones: G. binaiensis PRZ zone, G. bisphericus PRZ zone, Globigerinatella sp./C. dissimilis CRZ zone, P. sicana LOZ zone
• Neogene North Pacific Diatom Biochronology: Thalassiosira praefraga zone, Crucidenticula sawamurae - Thalassiosira fraga zone
• Geomagnetic Polarity Chrons: C5D chron, C5B chron, C5C chron, C6A chron, C5E chron, C6 chron
• Cretaceous-Cenozoic of New Zealand: Pareora epoch, Altonian age, Otaian age

This interval is used in the definition of 2259 collections

A total of 5204 collections with 52966 occurrences lie within this time span