"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) †Scythian Epoch
           1 (Stage) †Griesbachian Stage see Substage Griesbachian Substage
           2 (Stage) †Nammalian Stage
           3 (Stage) †Spathian Stage see Substage Spathian Substage