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Of, relating to, or being the epoch of geologic time from about 34 to 23 million years ago, the third epoch of the Tertiary Period. It is characterized by further development of modern mammals, including the rise of the true carnivores and their gradual replacement of the creodonts. See Table at geologic time.
The Oligocene Epoch.
(Geological Science) of, denoting, or formed in the third epoch of the Tertiary period, which lasted for 10 000 000 years
(Geological Science) the Oligocene the Oligocene epoch or rock series
[C19: oligo- + -cene]
Ol•i•go•cene(ˈɒl ɪ goʊˌsin)
1. noting or pertaining to an epoch of the Tertiary Period, occurring from 40 million to 25 million years ago.n.
2. the Oligocene Epoch or Series.
The third epoch of the Tertiary Period, from about 37 to 24 million years ago, characterized by the continued development of modern mammalian groups and the rise of the first cats, dogs, and related mammals. See Chart at geologic time.
See also related terms for recent.