oligocene

/ol-i-goh-seen/US // ˈɒl ɪ goʊˌsin //UK // (ˈɒlɪɡəʊˌsiːn, ɒˈlɪɡ-) //

低新世,寡头时代,寡居时代,寡头世

Definitions

adj.形容词 adjective

1
- : noting or pertaining to an epoch of the Tertiary Period, occurring from 40 to 25 million years ago.

n.名词 noun

Heteromyids are known from the Chadron formation, of early Oligocene age, in which a single tooth was found.
The Oligocene division has been generally accepted as a distinct period, but “Paleocene” is not so widely used.
A new species of the rodent Pipestoneomys from the Oligocene of Nebraska.
A soricid and two erinaceids from the White River Oligocene.
Its fauna is incompletely known; probably it is of Miocene or Oligocene origin.