| 1 | And third, there is geological evidence for plant extinctions in the Eocene. | |
| 2 | Few or any anthropoids are known to have existed in Africa during this period, known as the Eocene epoch. | |
| 3 | During the PETM, for reasons that are still unknown, the amount of carbon in Earth's atmosphere rose rapidly. | |
| 4 | The idea is to determine whether the PETM warming was unique "or a universal feature." | |
| 5 | The placement and orientation of these fossils also tells researchers about the conditions at Green River during the Eocene . |
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