stratigraphic intervals
   (System) †Carboniferous (358.9 - 298.9 Ma)
     (Series) †Upper
       (Stage) †Bashkirian (323.2 - 315.2 Ma)
         1 (Substage) †Cheremshanskian + Melekesskian
         2 (Substage) †Kinderscoutian-Yeadonian