Phanerozoic aeon

Definitions of Phanerozoic aeon

n the period from about 5,400 million years ago until the present

Phanerozoic, Phanerozoic eon
Example of:
aeon, eon
the longest division of geological time

Sign up, it's free!

Whether you're a student, an educator, or a lifelong learner, can put you on the path to systematic vocabulary improvement.