Word | Noun | Adjective | Verb | Adverb |
---|---|---|---|---|
Precambrian eon | Yes | No | No | No |
Archaeozoic aeon | Yes | No | No | No |
Precambrian eon (noun) | Archaeozoic aeon (noun) |
---|---|
the eon following the Hadean time and preceding the Phanerozoic eon; from about 3,800 million years ago until 544 million years ago | the time from 3,800 million years to 2,500 million years ago; earth's crust formed; unicellular organisms are earliest forms of life |