Cenozoic

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Cenozoic

, Caenozoic, Cainozoic
of, denoting, or relating to the most recent geological era, which began 65 000 000 years ago: characterized by the development and increase of the mammals
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005

Cenozoic

[¦sen·ə¦zō·ik]
(geology)
The youngest of the eras, or major subdivisions of geologic time, extending from the end of the Mesozoic Era to the present, or Recent. Also spelled as Cainozoic.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.