Subdivision of a period; one of the smallest subdivisions of the Paleozoic, Mesozoic, or Cenozoic eras; the epochs of the Cenozoic, for example, are the Paleocene, Eocene, Oligocene, Miocene, Pliocene, Pleistocene, and Holocene.
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normal polarity epoch (... polarity epoch. See Gauss normal epoch, Brunhes normal epoch, and paleomagnetisn.)
reversed polarity epoch (... reversed epoch, Matuyama reversed epoch. Cf. normal polarity epoch. See paleomagnetism.)
Holocene epoch (One of the Quaternary Epochs of the Cenozoic Era, beginning about 8 kya and continuing to the ...)