Also found in: Thesaurus, Medical, Encyclopedia, Wikipedia.
Of, relating to, or being the epoch of geologic time from about 56 to 34 million years ago, the second epoch of the Tertiary Period. It is characterized by warm climates, the rise of most modern mammalian families, and the formation of the Himalayas. See Table at geologic time.
The Eocene Epoch.
(Palaeontology) of, denoting, or formed in the second epoch of the Tertiary period, which lasted for 20 000 000 years, during which hooved mammals appeared
(Palaeontology) the Eocene the Eocene epoch or rock series
[C19: from eo- + -cene]
1. noting or pertaining to an epoch of the Tertiary Period, occurring from 55 million to 40 million years ago, characterized by the advent of the modern mammalian orders.n.
2. the Eocene Epoch or Series.
The second epoch of the Tertiary Period, from about 58 to 37 million years ago, characterized by warm climates and the rise of most modern families of mammals. See Chart at geologic time.