"global chronostratigraphic units"
Count: 5e; †118;85e
   †Precambrian (4600 - 541.0 Ma)
  Count: †4;21e
     (Era) †Sinian Era
    Count: [†*] †4;4e
       (Period) †Vendian Period
      Count: [†*] †4;2e
         (Epoch) †Ediacara Epoch
        Count: [†*] †2
           (Stage) †Poundian Stage
          Count: -