adjective eocene of, denoting, or formed in the second epoch of the Tertiary period, which lasted for 20 000 000 years, during which hooved mammals appeared 0
adjective eocene designating or of the second geologic epoch of the Paleogene, characterized by a warm climate and the development of mammals 0
adjective eocene (geology) of a geologic epoch within the Paleogene period from about 56 to 34 million years ago. 0
