Changhsingian

The Changhsingian (also known as Changxingian, Dorashamian, Dewey Lake, or Tatarian) is the second and final of two stages of the Lopingian epoch and the whole Permian period. It spans the time between 253.8 ± 0.7 Ma and 251.0 ± 0.7 Ma (million years ago). It is the final stage of the Paleozoic era and is followed by the Induan stage of the Triassic period.

The greatest mass extinction event in the Phanerozoic eon occurred during this age. The extinction rate peaked about a million years before the end of this stage.