noun, noun which may take the genitive case particle 'no'
ancient times; prehistoric times
Refers to the very distant past, often before recorded history. Used in historical, geological, or mythological contexts.
太古の昔、この地には海が広がっていた。
In ancient times, this area was covered by the sea.
太古の生物の化石が発見された。
Fossils of prehistoric creatures were discovered.