"global chronostratigraphic units"
   (Eon) Phanerozoic Eon (541.0 Ma - present)
     (Era) †Mesozoic Era (252.17 - 66.0 Ma)
       (Period) †Cretaceous Period (145.0 - 66.0 Ma)
         (Epoch) †Gulf Epoch
           1 (Stage) †Cenomanian Stage (100.5 - 93.9 Ma)
           2 (Stage) †Turonian Stage (93.9 - 89.8 Ma)
           3 (Stage) †Coniacian Stage (89.8 - 86.3 Ma)
           4 (Stage) †Santonian Stage (86.3 - 83.6 Ma)
           5 (Stage) †Campanian Stage (83.6 - 72.1 Ma)
           6 (Stage) †Maastrichtian Stage (72.1 - 66.0 Ma)