archaeozoic aeon

[Wallacejed]

the time from 3,800 million years to 2,500 million years ago; earths crust formed; unicellular organisms are earliest forms of life

[Rihanna]

The Archaeozoic Aeon, also known as the Archean Eon, is a geologic eon representing the time from the formation of the Earths crust about 4 billion years ago to around 2.5 billion years ago. During this period, the Earths crust was cooling and solidifying while life first started to form. This eon is divided into four eras: the Eoarchean, Paleoarchean, Mesoarchean, and Neoarchean.