Clue: It started about 2 1/2 million years ago
We have 1 answer for the clue It started about 2 1/2 million years ago. See the results below.
Possible Answers:
Related Clues:
- Rocky period?
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- The Paleolithic period is part of it
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- It began with the Paleolithic period
Last Seen In:
- New York Times - February 05, 2006
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