The Collaborative International Dictionary
Postpliocene
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.
Wiktionary
postpliocene
a. (context geology English) After the Pliocene epoch.