The Eocene is the second of five epochs in the Tertiary Period — the second of three epochs in the Paleogene — and lasted from about 55.8 to 33.9 million years ago.
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Paleogene is Greek meaning “ancient-born” and includes the Paleocene (Palaeocene) Epoch (66 million to 56 million years ago), the Eocene Epoch (56 million to ...