stratigraphic intervals
Count: [*†*] 2; †295
   (System) †Cambrian (541.0 - 485.4 Ma)
  Count: [†*] †34
     (Series) †Lower (541.0 - 509 Ma)
    Count: [†*] †12
       1 (Stage) †Tojonian
      Count: [†*] †2
       2 (Stage) †Botomian
      Count: [†*] †2
       3 (Stage) †Atdabanian
      Count: [†*] †2
       4 (Stage) †Tommotian
      Count: [†*] †2