Crossword Genius

Epoch when mammals arose (6)

Ross

I believe the answer is:

eocene

'epoch when mammals arose' is the definition.
(I've seen this in another clue)

This is all the clue.

(Other definitions for eocene that I've seen before include "Long-lasting epoch" , "Late Geological Period" , "Geological epoch" .)

I've seen this clue in the Universal.
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