Pa·leo·cene | \ ˈpā-lē-ə-ˌsēn 
, especially British ˈpa- \
, especially British ˈpa- \Definition of Paleocene
: of, relating to, or being the earliest epoch of the Tertiary or the corresponding series of rocks — see Geologic Time Table
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The first known use of Paleocene was in 1877
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