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Noun: Paleocene  'pey-lee-u,seen or 'pa-lee-u,seen
  1. The earliest epoch of the Tertiary period, from 66 to 56 million years ago, marked by the appearance of modern birds and earliest mammals
    - Paleocene epoch, Palaeocene [Brit, Cdn]

Type of: epoch

Part of: Tertiary, Tertiary period

Encyclopedia: Paleocene