The Oligocene (IPA: /ˈɒlɪɡəsiːn, -ɡoʊ-/ OL-ə-gə-seen, -⁠goh-) is a geologic epoch of the Paleogene Period and 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...

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

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

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...

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

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...

geologic timescale, the younger of two ages or upper of two stages of the Oligocene Epoch/Series. It spans the time between 27.82 and 23.03 Ma. The Chattian...

Neotethys formed during the Late Triassic and lasted in some form up to the Oligocene–Miocene boundary (about 24–21 million years ago) when it completely closed...

origin) and sometimes in Amphipithecidae, thought to originate in the Early Oligocene. Additionally, Phileosimias is sometimes placed in the Eosimiidae and...

Eocene/Early Oligocene) includes "Bubo" incertus Selenornis (Late Eocene/Early Oligocene) – includes "Asio" henrici Necrobyas (Late Eocene/Early Oligocene – Late...

the time from the end of the Paleocene Epoch to the beginning of the Oligocene Epoch. The start of the Eocene is marked by a brief period in which the...

hypercarnivorous diets that made them prone to extinction.: Fig. 1  By the Oligocene, all three subfamilies of canids (Hesperocyoninae, Borophaginae, and Caninae)...

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...

terrestrial mammals that has ever existed and lived from the early to late Oligocene epoch (34–23 million years ago). The first fossils were discovered in...

Genus Nocturnavis (Late Eocene/Early Oligocene) – includes Bubo incertus Genus Necrobyas (Late Eocene/Early Oligocene – Late Miocene, France) – includes...

forms and the emergence of cervids from the Oligocene to the early Pliocene. The latter half of the Oligocene (28–34 Mya) saw the appearance of the European...

Paleogene ruminants that lived in Europe from the late Eocene to the late Oligocene. The genus was erected in 1882 by Henri Filhol based on fossil remains...

Paraentelodon is an extinct entelodont from the Late Oligocene and Oligocene-Miocene boundary of Asia. The fossils of the type species P. intermedium...

(Late Eocene -? Late Oligocene of France) Genus Belgirallus (Early Oligocene of WC Europe) Genus Rallicrex (Corbula Middle/Late Oligocene of Kolzsvár, Romania)...

Corumictis wolsani from the early and late Oligocene (early and late Arikareean, Ar1–Ar3) of Oregon. Middle Oligocene Mustelictis from Europe might be a mustelid...

World likely via a trans-Atlantic route during the Oligocene. Their presence in the early Oligocene of Europe is well documented by several fossil specimens...

Kekenodontidae is an extinct family of non-neocete pelagicetes from the Late Oligocene (Chattian) of New Zealand. Although at times classified as basal mysticetes...

and baleen-assisted mysticetes in the northwestern Pacific during the Oligocene. Nobile et al. (2024) describe fossil material of a member of the genus...

Eocene/Early Oligocene) – anseranatid or anatid (own subfamily) Loxornis (Deseado Early Oligocene of Argentina) Paracygnopterus (Early Oligocene of Belgium...

genus being seeds from the Early Oligocene (Rupelian) of Oregon, USA. Fossil species are also known from the Late Oligocene (Chattian) of Europe, but they...

Europe that originated in the Eocene epoch and lived until the end of the Oligocene. They represent some of the largest terrestrial mammals to have ever lived...

Sciuridae. There are fossils from the Oligocene until Miocene in Asia, from Oligocene in Europe and from the Oligocene until the present in North America...