Permian Timeline

Cisuralian Epoch

Time range: 298.9 - 272.3 million years ago

Major Events: Evolution of early reptiles and therapsids.

Subepochs:

  • Asselian (298.9 - 290.1 Ma)
  • Sakmarian (290.1 - 279.3 Ma)
  • Artinskian (279.3 - 273.2 Ma)
  • Kungurian (273.2 - 272.3 Ma)

Notable Clades:

  • Dimetrodon (298.9 - 272.3 Ma)
  • Edaphosaurus (298.9 - 272.3 Ma)

Guadalupian Epoch

Time range: 272.3 - 259.8 million years ago

Major Events: Diversification of therapsids, first large herbivorous reptiles.

Subepochs:

  • Roadian (272.3 - 268.8 Ma)
  • Wordian (268.8 - 265.1 Ma)
  • Capitanian (265.1 - 259.8 Ma)

Notable Clades:

  • Anteosaurus (268.8 - 265.1 Ma)
  • Estemmenosuchus (268.8 - 259.8 Ma)

Lopingian Epoch

Time range: 259.8 - 251.9 million years ago

Major Events: Permian-Triassic extinction event.

Subepochs:

  • Wuchiapingian (259.8 - 254.2 Ma)
  • Changhsingian (254.2 - 251.9 Ma)

Notable Clades:

  • Lystrosaurus (254.2 - 251.9 Ma)
  • Dicynodon (259.8 - 251.9 Ma)