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Oligocene

Hierarchy:Phanerozoic Cenozoic  Paleogene
   Oligocene
Classification:Epoch (as per International Commission on Stratigraphy)
Top:23.03 Ma
Base:33.9 Ma
Preceeds:Neogene Miocene  Aquitanian
Follows:Eocene Priabonian
Primary Divisions:ChattianRupelian
Name origin:The name Oligocene comes from the Ancient Greek ὀλίγος (oligos, "few") and καινός (kainos, "new"), and refers to the sparsity of extant forms of molluscs.
Warm but cooling climate, moving towards Icehouse; Rapid evolution and diversification of fauna, especially mammals.

Major evolution and dispersal of modern types of flowering plants, a global expansion of grasslands, and a regression of tropical broad leaf forests to the equatorial belt.
 

Geologic Events

Event NameTypeAgeArea
Andean orogeny (ongoing)OrogenyMaximum Age: 200 MaSouth America


Overview of geological time

List all geological events
Mineral and/or Locality  
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