Word | Noun | Adjective | Verb | Adverb |
---|---|---|---|---|
Precambrian | Yes | No | No | No |
Archean aeon | Yes | No | No | No |
Precambrian (noun) | Archean 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 |