paleogene
adjective
1. (geology) Of a geologic period within the Cenozoic era; comprises the Paleocene, Eocene and Oligocene epochs from about 65 to 23 million years ago.
proper noun
1. (geology) The Paleogene period.
1. (geology) Of a geologic period within the Cenozoic era; comprises the Paleocene, Eocene and Oligocene epochs from about 65 to 23 million years ago.
1. (geology) The Paleogene period.