Crossword clue: of or relating to the earliest known rocks formed during the precambrian eon
2 answers found in Letterora's clue database (Wikidata facts, Open Trivia DB, WordNet and Webster definitions — all licensed sources).
Possible answers
archaean
8 letters
wn-def
of or relating to the earliest known rocks formed during the Precambrian Eon
archean
7 letters
wn-def
the time from 3,800 million years to 2,500 million years ago; earth's crust formed; unicellular organisms are earliest f