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