Pliocene

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Pliocene

, Pleiocene
of, denoting, or formed in the last epoch of the Tertiary period, which lasted for three million years, during which many modern mammals appeared
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005

Pliocene

[′plī·ə‚sēn]
(geology)
The youngest of the five geological epochs of the Tertiary Period. The Pliocene represents the interval of geological time (and rocks deposited during that time) extending from the end of the Miocene Epoch to the beginning of the Pleistocene Epoch of the Quaternary Period. Modern time scales assign the duration of 5.0 million to 1.8 million years ago to the Pliocene.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.