Crossword Genius

Geological time period (3)

Ross

I believe the answer is:

era

<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">geological time period</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is all the clue.<br/ ></span>

(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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