Carbon-dating teeth suggests two large mammal species roamed ... Previous research has noted other megafauna fossils around 6,000 and 5,000 years old in the American continent and elsewhere ...

"Future paleontologist, Molly, was out searching for fossils on Christmas morning when, what to her wondering eyes appeared…but a huge Megalodon tooth!" the museum wrote on its Facebook page.

To do our study, we selected shark tooth specimens from two significant Neogene-period fossil sites in Florida. The Neogene, from 2.6 to 23.5 million years ago, was a time of immense change in ...