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The Clue

A Tertiary epoch (7 letter answer)

The Answer

MIOCENE

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Notes

The answer MIOCENE is so rare that it appears less than once every 2500 puzzles.

Related Clues

Geological epoch when mastodons appeared

Definition

MIOCENE as a noun:

1. (Miocene, Miocene epoch) = from 25 million to 13 million years ago; appearance of grazing mammals