stratigraphic intervals
   (System) †Jurassic (201.3 - 145.0 Ma)
     (Series) †Upper (163.5 - 145.0 Ma)
       (Stage) †Kimmeridgian (157.3 - 152.1 Ma)
         1 (Substage) †mutabilis-autissioderensis Zones
         2 (Substage) †baylei + cymodoce Zones