Crossword Genius

Geologic timespan (3)

Ross

I believe the answer is:

eon

(Other definitions for eon that I've seen before include "Geological period" , "Era" , "An immense time" , "thousand million years" , "Vast age (alt. sp.)" .)

I've seen this clue in the Jonesin Crosswords, the Penny Press and the Jonesin'.
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