postpliocene

from The Collaborative International Dictionary of English v.0.48

Postpliocene \Post*pli"o*cene\, a. (Geol.) [Pref. post- +
   pliocene.]
   Of or pertaining to the period immediately following the
   Pliocene; Pleistocene. Also used as a noun. See {Quaternary}.
   [1913 Webster]