Oligocene
/ˈɒlɪgəʊsiːn/adjective
1- Geology of, relating to, or denoting the third epoch of the Tertiary period, between the Eocene and Miocene epochs【地质】渐新世的。
1.1
- as noun
the Oligocene
the Oligocene epoch or the system of rocks deposited during it渐新世; 渐新统。
The Oligocene epoch lasted from 35.4 to 23.3 million years ago. It was a time of falling temperatures, with evidence of the first primates.
词源
mid 19th cent.: from OLIGO- 'few' + Greek kainos 'new'.