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Which geologic era came before the Cenozoic Era?
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Cenozoic Era
Principal Cenozoic faunal migration routes and barriers.
The geologic era that preceded the Cenozoic Era is the Mesozoic Era.12
The Mesozoic Era, often referred to as the age of the dinosaurs, lasted from approximately 252 million to 66 million years ago. It serves as the middle of the three major eras within the Phanerozoic Eon, following the Paleozoic Era and preceding the Cenozoic Era, which continues to the present day.1234