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The Palaeogene (meaning “old generation” in Greek) is the first geological period of the Cainozoic and the tenth period in the Phanerozoic eon. It began 65 million years ago, and ended 23 million years ago.[1] Before it was the Cretaceous. The Palaeogene was followed by the Neogene.
The Palaeogene had three stages: Palaeocene, Eocene and Oligocene.
The Palaeogene and the succeeding Neogene were originally considered to be one period, the Tertiary, until it was split recently .