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Paleogene

[pey-lee-uh-jeen; especially British pal-ee-]Geology
adjective
  1. noting or pertaining to the earlier part of the Cenozoic Era, in the system adopted by some geologists, occurring from 65 to 25 million years ago and including the Oligocene, Eocene, and Paleocene epochs: corresponds to the earlier part of the Tertiary Period in the system generally used in the U.S.Compare Neogene.
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noun
  1. the Paleogene Period or System.
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Origin of Paleogene

1880–85; < German Paläogen, equivalent to paläo- paleo- + -gen (< Greek genésthai to be born); cf. -gen
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

paleogene in Science

Paleogene

[pālē-ə-jēn′]
  1. The oldest of two subdivisions of the Tertiary Period, including the Paleocene, Eocene, and Oligocene Epochs.
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The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.