Crossword Genius

Geological time period (3)

Ross

I believe the answer is:

era

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

This is all the clue.

(Other definitions for era that I've seen before include "Are involved in time span" , "Age marked by a distinctive character" , "Epoch, period" , "Stage" , "Long historical period" .)

I've seen this clue in the Universal and The Telegraph.
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