Post Permian Extinction The Triassic period begins after the Permian Extinction , "Somehow, most of the life on Earth perished in a brief moment of geologic time roughly 250 million years ago. Scientists call it the Permian-Triassic extinction or "the Great Dying" -- No class of life was spared from the devastation. Trees, plants, lizards, proto-mammals, insects, fish, mollusks, and microbes -- all were nearly wiped out. Roughly 9 in 10 marine species and 7 in 10 land species vanished." Cite, http://science.nasa.gov/science-news/science-at-nasa/2002/28jan_extinction/
I encourage you to go to the Triassic period because it is home to the first dinosaurs, the first mammals, and we will be able to see how life managed to survive after the Permian-Triassic extinction.