Crossword clue: from 405 million to 345 million years ago; preponderance of fishes and appearance of amphibians and ammonites
1 answer found in Letterora's clue database (Wikidata facts, Open Trivia DB, WordNet and Webster definitions — all licensed sources).
Possible answers
devonian
8 letters
wn-def
from 405 million to 345 million years ago; preponderance of fishes and appearance of amphibians and ammonites