"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)
         1 (Epoch) †Lias Epoch
         2 (Epoch) †Dogger Epoch
         3 (Epoch) †Malm Epoch