Oligocene

[ ol-i-goh-seen ]

/ ˈɒl ɪ goʊˌsin /

Geology

adjective

noting or pertaining to an epoch of the Tertiary Period, occurring from 40 to 25 million years ago.

noun

the Oligocene Epoch or Series.

Origin of Oligocene

First recorded in 1855–60; oligo- + -cene

OTHER WORDS FROM Oligocene

post-Ol·i·go·cene, adjective

Words nearby Oligocene

oligarchic, oligarchy, oligemia, oligo-, oligoamnios, Oligocene, oligochaete, oligoclase, oligocystic, oligodactyly, oligodendria

Dictionary.com UnabridgedBased on the Random House Unabridged Dictionary, © Random House, Inc. 2020

Example sentences from the Web for Oligocene

It is these latter forms which come nearest to modern Carnivora, most of them being of Oligocene age.
Encyclopaedia Britannica, 11th Edition, Volume 7, Slice 6|Various
The genus Mesohippus, of the middle Oligocene, may be selected as a kind of half-way stage in the long progression.
Darwin and Modern Science|A.C. Seward and Others
The genus began in the Oligocene and continued down to the Pliocene.
The Cambridge Natural History, Vol X., Mammalia|Frank Evers Beddard
Its fauna is incompletely known; probably it is of Miocene or Oligocene origin.
Report on the Radiolaria Collected by H.M.S. Challenger During the Years 1873-1876, First Part: Porulosa (Spumellaria and Acantharia)|Ernst Haeckel

Both lineages likely had an earlier history extending back to their divergence in the Oligocene.
Evolution and Classification of the Pocket Gophers of the Subfamily Geomyinae|Robert J. Russell

British Dictionary definitions for Oligocene

Oligocene

/ (ˈɒlɪɡəʊˌsiːn, ɒˈlɪɡ-) /

adjective

of, denoting, or formed in the third epoch of the Tertiary period, which lasted for 10 000 000 years

noun

the Oligocene the Oligocene epoch or rock series

Word Origin for Oligocene

C19: oligo- + -cene

Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Scientific definitions for Oligocene

Oligocene

[ ŏl′ĭ-gō-sēn′ ]

The third epoch of the Tertiary Period, from about 37 to 24 million years ago. During this time there was an increase in volcanic activity, and Australia and South America separated from Antarctica. The climate started to cool and a glacier started to form in Antarctica. Modern mammalian groups continued to develop, and the first cats, dogs, horses, and related mammals appeared. Artiodactyls (even-toed ungulates) took over from the perissodactyls (uneven-toed ungulates) as the dominant medium-sized herbivores. Many types of grass also first appeared at this time. See Chart at geologic time.

单词	oligocene
释义	Oligocene [ ol-i-goh-seen ] / ˈɒl ɪ goʊˌsin / Geology adjective noting or pertaining to an epoch of the Tertiary Period, occurring from 40 to 25 million years ago. noun the Oligocene Epoch or Series. Origin of Oligocene First recorded in 1855–60; oligo- + -cene OTHER WORDS FROM Oligocene post-Ol·i·go·cene, adjective Words nearby Oligocene oligarchic, oligarchy, oligemia, oligo-, oligoamnios, Oligocene, oligochaete, oligoclase, oligocystic, oligodactyly, oligodendria Dictionary.com UnabridgedBased on the Random House Unabridged Dictionary, © Random House, Inc. 2020 Example sentences from the Web for Oligocene It is these latter forms which come nearest to modern Carnivora, most of them being of Oligocene age. Encyclopaedia Britannica, 11th Edition, Volume 7, Slice 6\|Various The genus Mesohippus, of the middle Oligocene, may be selected as a kind of half-way stage in the long progression. Darwin and Modern Science\|A.C. Seward and Others The genus began in the Oligocene and continued down to the Pliocene. The Cambridge Natural History, Vol X., Mammalia\|Frank Evers Beddard Its fauna is incompletely known; probably it is of Miocene or Oligocene origin. Report on the Radiolaria Collected by H.M.S. Challenger During the Years 1873-1876, First Part: Porulosa (Spumellaria and Acantharia)\|Ernst Haeckel Both lineages likely had an earlier history extending back to their divergence in the Oligocene. Evolution and Classification of the Pocket Gophers of the Subfamily Geomyinae\|Robert J. Russell British Dictionary definitions for Oligocene Oligocene / (ˈɒlɪɡəʊˌsiːn, ɒˈlɪɡ-) / adjective of, denoting, or formed in the third epoch of the Tertiary period, which lasted for 10 000 000 years noun the Oligocene the Oligocene epoch or rock series Word Origin for Oligocene C19: oligo- + -cene Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012 Scientific definitions for Oligocene Oligocene [ ŏl′ĭ-gō-sēn′ ] The third epoch of the Tertiary Period, from about 37 to 24 million years ago. During this time there was an increase in volcanic activity, and Australia and South America separated from Antarctica. The climate started to cool and a glacier started to form in Antarctica. Modern mammalian groups continued to develop, and the first cats, dogs, horses, and related mammals appeared. Artiodactyls (even-toed ungulates) took over from the perissodactyls (uneven-toed ungulates) as the dominant medium-sized herbivores. Many types of grass also first appeared at this time. See Chart at geologic time. The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
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