Paleocene (adj.)youdaoicibaDictYouDict[Paleocene 词源字典]
in reference to the geological epoch preceding the Eocene, 1877, from French paléocène (Schimpter, 1874), coined from paleo- + Greek kainos "new" (see recent). It is, thus, the "old new" age.[Paleocene etymology, Paleocene origin, 英语词源]