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Division of geological time (3)

Ross

I think it could be either:

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3

4

era

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

This is all the clue.

(Other definitions for era that I've seen before include "Significant time" , "Long historic period" , "Series of years" , "Important date" , "Aeon" .)

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