stratigraphic intervals
Count: [*†*] 2; †295
   (System) †Cambrian (541.0 - 485.4 Ma)
  Count: [†*] †34
     (Series) †Lower (541.0 - 509 Ma)
    Count: [†*] †12
       (Stage) †Tommotian
      Count: [†*] †2
         1 (Substage) †regularis-lenicus Zones
        Count: -
         2 (Biozone) †sunnaginicus Zone
        Count: -