Enter a clue or pattern or both:
The Clue
Of a Tertiary epoch (9 letter answer)
The Answer
PALEOCENE
Tags
Notes
The answer PALEOCENE is so rare that it appears less than once every 2500 puzzles.
Definition
PALEOCENE as a noun:
1. (Paleocene, Paleocene epoch) = from 63 million to 58 million years ago; appearance of birds and earliest mammals