the time from 3, 800 million years to 2, 500 million years ago; earths crust formed; unicellular organisms are earliest forms of life
[ Syn: archean , archean eon , archean aeon , archeozoic , archaeozoic , archeozoic eon , archaeozoic aeon ]
Archean (n.)
of or relating to the earliest known rocks formed during the Precambrian Eon
[ Syn: archaean ]