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paleo- +‎ -gene. From Ancient Greek παλαιός (palaiós, old) + γενεά (geneá, generation).

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Paleogene (not comparable)

  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.

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  1. (geology) The Paleogene period.

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