archean_era
1. [ noun ] (geology) the time prior to 2,500 million years ago; earth's crust formed; unicellular organisms are earliest forms of life
Synonyms: archaeozoic_era archean archeozoic archeozoic_era archaeozoic
Related terms: era Precambrian
Similar spelling:   archean_eon
  archean_aeon
  archaean
  Archiannelida
  archenteron
  archiannelid