Megalodon sharks lived at the same time as dinosaurs

Megalodon (Carcharocles megalodon) did not appear until the Paleocene epoch, approximately 20 million years after the K-Pg extinction event that killed non-avian dinosaurs 66 million years ago. Megalodon thrived during the Cenozoic (roughly 23-3 million years ago), coexisting with early mammals, birds, and other modern fauna, but never with dinosaurs. The confusion partly stems from prehistoric fiction media that conflates all large extinct animals into a unified 'age of monsters.' Marine reptiles like mosasaurs did share seas with dinosaurs, but Megalodon was a Cenozoic innovation.