relating to or denoting the earlier division of the Tertiary period, comprising the Palaeocene, Eocene, and Oligocene epochs
the Palaeogene world was still thickly forested
the earlier division of the Tertiary period, comprising the Palaeocene, Eocene, and Oligocene epochs, or the system of rocks deposited during it
the rift abruptly changed course in the Palaeogene and began to separate Northern Europe from Greenland