| 1 | This was towards the end of the Triassic period. | |
| 2 | But what exactly happened towards the end of the Triassic has been much debated. | |
| 3 | This is the first report of Triassic Radiolaria within the Yarlung-Zangbo Suture Zone. | |
| 4 | About halfway through that period, known as the Triassic, an asteroid struck Earth. | |
| 5 | Conodonts went extinct at the end of the Triassic Period, about the time dinosaurs were evolving. |