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Palaeocene

adjective
  1. of, denoting, or formed in the first epoch of the Tertiary period, which lasted for 10 million years
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noun
  1. the Palaeocene the Palaeocene epoch or rock series
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Word Origin

C19: from French from paléo- palaeo- + Greek kainos new, recent
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012