The Changhsingian (254–252 Ma) is the third and last stage of the Late Permian occurring after the Wuchiapingian, and before the Induan (Early Triassic).
254.14±0.07–251.902±0.024 Ma
Phanerozoic; Mesozoic; Permian; Lopingian
The largest extinction event in Earth's history (more detail)
Methanogens may have cause the largest extinction in Earth's history, the Permian Extinction