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Division of geological time (3)

Ross

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3

4

aeon

'division of geological time' is the definition.
(I've seen this before)

This is all the clue.

(Other definitions for aeon that I've seen before include "Eternity" , "Indefinitely long period of time" , "Immeasurably long period of time" , "With lots of time" , "Vast time period" .)

I've seen this clue in the Irish Times (Simplex) and The Irish Times.
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