Megalodon
One of the largest sharks in history, reaching 15 m or more, thought to have gone extinct about 3.6 million years ago. Survival theories that it still lives in the deep sea are told as a cryptid story, but there is no scientific evidence.
Mystery Timeline｜Undated myths and BC
Mysteries of the Myth & Prehistory
Gods and mythical beasts of world mythology, ancient ruins and legends from before recorded history.
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About 23 million to 3.6 million years ago