The Permian-Triassic (P-Tr) extinction event, sometimes informally called the Great Dying, was an extinction event that occurred 251.4 million years ago. It was the Earth's most severe extinction event, with up to 96 percent of all marine species and 70 percent of terrestrial vertebrate species becoming extinct. The Exitinction was caused by an asteroid hit.
Permian-Triassic in "Before the Beginning"Edit
In order to view the Permian-Triassic event with a time-viewer, the point of view had to be set a great distance into space.