Cenozoic (redirected from Age of Mammals)
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Cainozoic period a geological era that includes the QUATERNARY PERIOD and TERTIARY PERIOD, beginning some 65 million years ago and extending up to the present time. See GEOLOGICAL TIME.
Collins Dictionary of Biology, 3rd ed. © W. G. Hale, V. A. Saunders, J. P. Margham 2005