stratigraphic intervals
   (System) †Carboniferous (358.9 - 298.9 Ma)
     (Series) †Upper
       (Stage) †Moscovian (315.2 - 307.0 Ma)
         1 (Substage) †Podolskian + Myachkovskian
         2 (Substage) †Vereiskian + Kashirskian