Oligocene
[ ol-i-goh-seen ]
/ ˈɒl ɪ goʊˌsin /
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.
OTHER WORDS FROM Oligocene
post-Ol·i·go·cene, adjectiveExample sentences from the Web for oligocene
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
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.