"age of mammals" | Definition and Related Words

Noun

is an instance of: era, geological era - a major division of geological time; an era is usually divided into two or more periods
has:
- age of man, quaternary, quaternary period - last 2 million years
- tertiary, tertiary period - from 63 million to 2 million years ago
is a part of: phanerozoic, phanerozoic aeon, phanerozoic eon - the period from about 540 million years ago until the present, a period when abundant life existed

same as: cenozoic, cenozoic era