Crossword Genius

Geological time unit (5)

Ross

I believe the answer is:

epoch

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

This is all the clue.

(Other definitions for epoch that I've seen before include "Historical era" , "Period of time marked by a great event" , "Major division or period of history" , "extended period" , "Particular historic time period" .)

I've seen this clue in the Universal and The New York Times.
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