Word Study
phanerozoic eon
WORDNET DICTIONARY
Noun phanerozoic eon has 1 sense
- phanerozoic eon(n = noun.time) phanerozoic, phanerozoic aeon - the period from about 5,400 million years ago until the present; Array has parts: age of mammals, cenozoic, cenozoic era
is a kind of aeon, eon
For further exploring for "phanerozoic eon" in Webster Dictionary Online