Crossword Genius

Geological age (3)

Ross

I believe the answer is:

eon

'geological age' is the definition.
(I've seen this in another clue)

This is the entire clue.

(Other definitions for eon that I've seen before include "In time, long division" , "Prolonged period" , "billion years" , "Major division of geological time" , "Very long age" .)

I've seen this clue in The Telegraph, The Washington Post, the Evening Standard and the L.A. Times Daily.
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