"global chronostratigraphic units"
Count: 5e; †118;85e
   (Eon) Phanerozoic Eon (541.0 Ma - present)
  Count: [*†*] 4e; †114;63e
     (Era) †Mesozoic Era (252.17 - 66.0 Ma)
    Count: [†*] †31;11e
       (Period) †Triassic Period (251.902 - 201.3 Ma)
      Count: [†*] †8;3e
         1 (Epoch) †Scythian Epoch
        Count: [†*] †3
         2 (Epoch) †Mid Triassic Epoch (247.2 - 237 Ma)
        Count: [†*] †2
         3 (Epoch) †Late Triassic Epoch (237 - 201.3 Ma)
        Count: [†*] †3