| Answer | Crossword Clue |
|---|---|
| STONEAGE | Circa 12 million years ago. |
| STONEAGE | It started about 2 1-2 million years ago |
| PLIOCENE | About 5 million years ago |
| NEOCENEAGE | Roughly forty million years ago. |
| ICEAGE | About a million years ago. |
| EOCENE | Epoch 50 million years ago |
| CAMBRIAN | Time period, 500 million years ago. |
| EOCENE | Epoch of 50 million years ago |
| PANGAEA | Supercontinent of 200+ million years ago |
| PANGAEA | Supercontinent of 200 million years ago |
| EOCENE | Occurring 40 to 55 million years ago |
| PLIOCENE | Epoch from 10 to 2 million years ago |
| PLIOCENE | Epoch from two to five million years ago |
