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...

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

(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...

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

was marked by the Eocene–Oligocene extinction event, the European face of which is known as the Grande Coupure. The Oligocene Epoch spans from 33.9 million...

Pliocene has. The Miocene followed the Oligocene and preceded 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...

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...

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...

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...

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...

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

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...

formation period ranges from the Middle to the Upper Eocene to the Lower Oligocene, which corresponds to an age of around 41 to 28 million years ago. The...

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...

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...

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...

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...

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...

from Oligocene with unclear systematic position. It was originally described from a jaw fragment for P. asiaticus, from Mongolia, Middle Oligocene. The...

(1996). "Small arctoid and feliform carnivorans". The Terrestrial Eocene-Oligocene Transition in North America, Part II: Common Vertebrates of the White...

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

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

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

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...

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

Waipatiidae is an extinct family of odontocetes currently known from the Oligocene of the Pacific Ocean and possibly Europe and the Caucasus. Waipatiidae...