archaeozoic_aeon
1. [ noun ] (geology) the time from 1.5 billion to 5 billion years ago; earth's crust formed; unicellular organisms are earliest forms of life
Synonyms: Archaeozoic Archeozoic_era Archaeozoic_era archean archean_aeon archean_eon archeozoic_eon Archeozoic
Related terms: eon era Precambrian
Similar spelling:   archeozoic_eon
  Archaeozoic_era
  Archeozoic_era