Crossword clue: of, pertaining to, or characterizing, the most recent division of the tertiary age.
1 answer found in Letterora's clue database (Wikidata facts, Open Trivia DB, WordNet and Webster definitions — all licensed sources).
Possible answers
pliocene
8 letters
web-def
from 13 million to 2 million years ago; growth of mountains; cooling of climate; more and larger mammals