"global chronostratigraphic units"
Count: 5e; †118;85e
   (Eon) Phanerozoic Eon (541.0 Ma - present)
  Count: [*†*] 4e; †114;63e
     (Era) †Paleozoic Era (541.0 - 251.902 Ma)
    Count: [†*] †67;41e
       (Period) †Cambrian Period (541.0 - 485.4 Ma)
      Count: [†*] †7;3e
         (Epoch) †Caerfai Epoch
        Count: [†*] †3
           (Stage) †Atdabanian Stage
          Count: -