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This is a tooth from the famous monster Megalodon shark, a species of extinct giant  mackerel shark that lived approximately 23 to 3.6 million years ago, between the Early Miocene and Early Pliocene eras. ...

This is a tooth from  Hemipristis serra , an extinct species of weasel shark from the Miocene epoch , 23.03 to 5.33 million years ago. It was found in spoil material dredged from the...