NOUN
- the time from 3,800 million years to 2,500 million years ago; earth's crust formed; unicellular organisms are earliest forms of life
How To Use Archean eon In A Sentence
- The rocks dated back into the Archean eon, before 2.5 billion years ago.
- During the Archean Eon life started and was dominated by one-celled prokaryotic life forms. Geologic time
