Crossword Genius

Geological span (3)

Ross

I believe the answer is:

era

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

This is the entire clue.

(Other definitions for era that I've seen before include "Stage" , "Important time" , "Major division of geological time" , "Long period of history" , "Geological age" .)

I've seen this clue in The New York Times, the LA Times and The Wall Street Journal.
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