The Oligocene (IPA: /ˈɒlɪɡəsiːn, -ɡoʊ-/ OL-ə-gə-seen, -⁠goh-) is a geologic epoch of the Paleogene Period that extends from about 33.9 million to 23 million...

(H) K–Pg Tr–J P–Tr Cap Late D O–S The Eocene–Oligocene extinction event, also called the Eocene-Oligocene transition (EOT) or Grande Coupure (French for...

period of the Cenozoic Era and is divided into the Paleocene, Eocene, and Oligocene epochs. The earlier term Tertiary Period was used to define the time now...

the Oligocene onward, belonging to several lineages: Wieslochia (Early Oligocene of Frauenweiler, Germany) – suboscine Resoviaornis (Early Oligocene of...

particularly during the Paleocene–Eocene Thermal Maximum. However, the Eocene to Oligocene transition and the Quaternary glaciation dried and cooled Earth. Cenozoic...

bulbosa (Tasmania, Early Oligocene) †Nothofagus cethanica (Tasmania, Early Oligocene) †Nothofagus cooksoniae (Tasmania, Early Oligocene) †Nothofagus crenulata...

geologic timescale, the older of two ages or the lower of two stages of the Oligocene Epoch/Series. It spans the time between 33.9 and 27.82 Ma. It is preceded...

has. The Miocene is preceded by the Oligocene and is followed by the Pliocene. As Earth went from the Oligocene through the Miocene and into the Pliocene...

insects, birds, frogs and the tuatara. In the Duntroonian stage of the Oligocene, the land area of Zealandia was at a minimum. It has been suggested that...

05 Ma to 15.97 ± 0.05 Ma (million years ago). It was preceded by the Oligocene epoch. As the climate started to get cooler, the landscape started to...