Paleocene

Paleocene

[pey-lee-uh-seen or, esp. British, pal-ee-] Geology.
adjective
1.
noting or pertaining to an epoch of the Tertiary Period, from 65 to 55 million years ago, and characterized by a proliferation of mammals. See table under geologic time.
noun
2.
the Paleocene Epoch or Series.

Origin:
1875–80; paleo- + -cene

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Etymonline
Word Origin & History

Paleocene
geological epoch preceding the Eocene, 1877, from Fr. paléocène (Schimpter, 1874), coined from paleo- + Gk. kainos "new" (see recent). It is, thus, the "old new" age.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Science Dictionary
Paleocene   (pā'lē-ə-sēn')  Pronunciation Key 
The earliest epoch of the Tertiary Period, from about 65 to 58 million years ago. During this time, the Rocky Mountains formed and sea levels dropped, exposing dry land in North America, Australia, and Africa. Many new types of small mammals evolved and filled the niches left empty after the extinctions that ended the Cretaceous Period. Soft-bodied squid replaced the ammonites as the dominant form of mollusk. See Chart at geologic time.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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