"global chronostratigraphic units"
   (Eon) Phanerozoic Eon (541.0 Ma - present)
     (Era) †Mesozoic Era (252.17 - 66.0 Ma)
       (Period) †Jurassic Period (201.3 - 145.0 Ma)
         (Epoch) †Lias Epoch
           1 (Stage) †Hettangian Stage (201.3 - 199.3 Ma)
           2 (Stage) †Sinemurian Stage (199.3 - 190.8 Ma)
           3 (Stage) †Pliensbachian Stage (190.8 - 182.7 Ma)
           4 (Stage) †Toarcian Stage (182.7 - 174.1 Ma)