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

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.