Crossword Genius

Paleozoic ___ (3)

Ross

I believe the answer is:

era

'paleozoic' 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 "Are involved in time span" , "Long stretch" , "Special time" , "Age marked by a distinctive character" , "Cycle" .)

I've seen this clue in The Washington Post and the USA Today.
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