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...

Resoviaornis (Early Oligocene of Wola Rafałowska, Poland) Jamna (Early Oligocene of Jamna Dolna, Poland) Winnicavis (Early Oligocene of Lower Silesian Voivodeship...

Cretaceous Period. This period consists of the Paleocene, Eocene, and Oligocene epochs. The end of the Paleocene (56 Mya) was marked by the Paleocene–Eocene...

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

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...

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...

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...

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

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

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...

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...

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

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

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...

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

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...

of the family Ekgmowechashalidae, known primarily from the Eocene and Oligocene of Asia. Notably, Palaeohodites has been recovered as the sister taxon...

Eocene/Early Oligocene) Selenornis (Late Eocene/Early Oligocene) Necrobyas (Late Eocene/Early Oligocene – Early Miocene) Prosybris (Early Oligocene? – Early...

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

sometimes referred to as Duchesnehippus intermedius, had teeth similar to Oligocene equids, although slightly less developed. Whether Duchesnehippus was a...

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

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...

its successors (the Mediterranean Sea or the Indian Ocean) during the Oligocene and the early and middle Miocene times, but at the onset of the late Miocene...

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

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

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...

(Middle Eocene of Uzbekistan), Manu (early Oligocene of New Zealand), and an undescribed form from the Late Oligocene of South Carolina. The oldest widely accepted...