Oligocene
Pronunciation: /ˈɒlɪgə(ʊ)siːn/
adjective
Geology- relating to or denoting the third epoch of the Tertiary period, between the Eocene and Miocene epochs.
- (as noun the Oligocene) the Oligocene epoch or the system of rocks deposited during it.
- 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
Origin:
mid 19th century: from oligo- 'few' + Greek kainos 'new'