(the time from 3, 800 million years to 2, 500 million years ago
earth's crust formed
unicellular organisms are earliest forms of life)
Archean, Archean eon, Archean aeon, Archeozoic, Archaeozoic, Archeozoic eon, Archaeozoic aeon
synonim: era azoiczna
synonim: archaik
synonim: archeozoik
synonim: azoik