"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) †Mid Triassic Epoch (247.2 - 237 Ma)
           1 (Stage) †Anisian Stage (247.2 - 242 Ma)
           2 (Stage) †Ladinian Stage (242 - 237 Ma)