"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) †Early Cretaceous Epoch (145.0 - 100.5 Ma) (Stage) †Aptian Stage (125.0 - 113.0 Ma)