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Of, relating to, or being the epoch of geologic time from 66 to 56 million years ago, the oldest epoch of the Tertiary Period. It is characterized by the formation of the Rocky Mountains and by the appearance of placental mammals. See Table at geologic time.
The Paleocene Epoch.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
(Geological Science) a variant spelling of Palaeocene
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
Pa•le•o•cene(ˈpeɪ li əˌsin; esp. Brit. ˈpæl i-)
1. noting or pertaining to an epoch of the Tertiary Period, from 65 million to 55 million years ago, a time of mammalian proliferation.n.
2. the Paleocene Epoch or Series.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
The earliest epoch of the Tertiary Period, from about 65 to 58 million years ago, characterized by the appearance of placental mammals and the formation of the Rocky Mountains and Himalayas. See Chart at geologic time.
The American Heritage® Student Science Dictionary, Second Edition. Copyright © 2014 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.