"global chronostratigraphic units"
   (Eon) Phanerozoic Eon (541.0 Ma - present)
     (Era) †Mesozoic Era (252.17 - 66.0 Ma)
       (Period) †Triassic Period (251.902 - 201.3 Ma)
         (Epoch) †Late Triassic Epoch (237 - 201.3 Ma)
           1 (Stage) †Carnian Stage (237 - 227 Ma)
           2 (Stage) †Norian Stage (227 - 208.5 Ma)
           3 (Stage) †Rhaetian Stage (208.5 - 201.3 Ma)