Crossword Genius

Phanerozoic ___ (what we live in) (3)

Ross

I believe the answer is:

eon

(Other definitions for eon that I've seen before include "Long period of time" , "Prolonged period" , "Geological period" , "Vast age; eternity" , "Vast period" .)

I've seen this clue in The New York Times.
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