Of or belonging to the geologic time, rock series, or sedimentary deposits of the third epoch of the Tertiary Period, characterized by futher development of modern mammalian fauna, including the rise of the true carnivores and their gradual replacement of the creodonts.
They are geological epochs.
Oligocene
From the oligocene to the miocene.
upper ecocene to lower oligocene
The Oligocene Epoch.
This is called the Oligocene Epoch.
The nummulites mode of life was between the palocene and oligocene time periods.
Dinohyus ruled from the Oligocene epoch to the miocene, it ruled for about 13 million years.
Spheniscidae gen. et sp. indet. CADIC P 21 (Leticia Middle Eocene of Punta Torcida, Argentina)[11] Delphinornis (Middle/Late Eocene? - Early Oligocene of Seymour Island, Antarctica) - Palaeeudyptinae, basal, new subfamily 1? Archaeospheniscus (Middle/Late Eocene - Late Oligocene) - Palaeeudyptinae? New subfamily 2? Marambiornis (Late Eocene -? Early Oligocene of Seymour Island, Antarctica) - Palaeeudyptinae, basal, new subfamily 1? Mesetaornis (Late Eocene -? Early Oligocene of Seymour Island, Antarctica) - Palaeeudyptinae, basal, new subfamily 1? Tonniornis (Late Eocene -? Early Oligocene of Seymour Island, Antarctica) Wimanornis (Late Eocene -? Early Oligocene of Seymour Island, Antarctica) Duntroonornis (Late Oligocene of Otago, New Zealand) - possibly Spheniscinae Korora (Late Oligocene of S Canterbury, New Zealand) Kairuku (Late Oligocene of E South Island, New Zealand) Platydyptes (Late Oligocene of New Zealand) - possibly not monophyletic; Palaeeudyptinae, Paraptenodytinae or new subfamily?[12] Spheniscidae gen. et sp. indet. (Late Oligocene/Early Miocene of Hakataramea, New Zealand)[verification needed] Madrynornis (Puerto Madryn Late Miocene of Argentina) - possibly Spheniscinae Pseudaptenodytes (Late Miocene/Early Pliocene) Dege (Early Pliocene of South Africa) - possibly Spheniscinae Marplesornis (Early Pliocene) - possibly Spheniscinae Nucleornis (Early Pliocene of Duinfontain, South Africa) - possibly Spheniscinae Inguza (Late Pliocene) - probably Spheniscinae; formerly Spheniscus predemersus Family Spheniscidae Subfamily Palaeeudyptinae - Giant penguins (fossil) Crossvallia (Cross Valley Late Paleocene of Seymour Island, Antarctica) - tentatively assigned to this subfamily Anthropornis (Middle Eocene? - Early Oligocene of Seymour Island, Antarctica) - tentatively assigned to this subfamily Nordenskjoeld's Giant Penguin, Anthropornis nordenskjoeldi Icadyptes (Late Eocene of Atacama Desert, Peru) Palaeeudyptes (Middle/Late Eocene - Late Oligocene) - polyphyletic; some belong in other subfamilies Pachydyptes (Late Eocene) Anthropodyptes (Middle Miocene) - tentatively assigned to this subfamily Subfamily Paraptenodytinae - Stout-footed penguins (fossil) Arthrodytes (San Julian Late Eocene/Early Oligocene - Patagonia Early Miocene of Patagonia, Argentina) Paraptenodytes (Early - Late Miocene/Early Pliocene) Subfamily Palaeospheniscinae - Slender-footed penguins (fossil) Eretiscus (Patagonia Early Miocene of Patagonia, Argentina) Palaeospheniscus (Early? - Late Miocene/Early Pliocene) - includes Chubutodyptes
North America, Asia and Europe was their home in the Oligocene and the earl Miocene period.
An anoplotherium is a member of the extinct genus Anoplotherium, an ungulate known to have lived from the Late Eocene era to the Early Oligocene.
baluchitherium , extinct primitive rhinoceros, belonging to the genus Baluchitherium, of the Oligocene epoch, fossilized bones of which were found in central Asia