stratigraphic intervals
   (System) †Triassic (251.902 - 201.3 Ma)
     (Series) †Middle (247.2 - 237 Ma)
       (Stage) †Anisian (247.2 - 242 Ma)
         1 (Substage) †Illyrian
         2 (Substage) †Pelsonian
         3 (Substage) †Aegean