"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) †Zechstein Epoch
           1 (Stage) †Ufimian Stage see Substage Wordian Substage
           2 (Stage) †Wordian Stage (266.9 - 264.28 Ma)
           3 (Stage) †Capitanian Stage (264.28 - 259.51 Ma)
           4 (Stage) †Longtanian Stage see Substage Djullian Substage
           5 (Stage) †Changxingian Stage see Substage Dorashamian Substage