"global chronostratigraphic units" (Eon) Phanerozoic Eon (541.0 Ma - present) (Era) †Paleozoic Era (541.0 - 251.902 Ma) (Period) †Permian Period (298.9 - 251.902 Ma) (Epoch) †Rotliegendes Epoch 1 (Stage) †Asselian Stage (298.9 - 293.52 Ma) 2 (Stage) †Sakmarian Stage (293.52 - 290.1 Ma) 3 (Stage) †Artinskian Stage (290.1 - 283.5 Ma) 4 (Stage) †Kungurian Stage (283.5 - 273.01 Ma)