Word | Noun | Adjective | Verb | Adverb |
---|---|---|---|---|
Phanerozoic aeon | Yes | No | No | No |
Age of Mammals | Yes | No | No | No |
Phanerozoic aeon (noun) | Age of Mammals (noun) |
---|---|
the period from about 540 million years ago until the present, a period when abundant life existed | approximately the last 63 million years |