太たい古こ代だい

noun

Archaeozoic Era; Archeozoic Era

Geological term for the early Precambrian era, roughly 4.0 to 2.5 billion years ago. Used mainly in scientific or educational contexts.

• 太たい古こ代だいの岩がん石せきから生せい命めいの痕こん跡せきが見みつかった。

  Traces of life were found in rocks from the Archaeozoic Era.