3 min read From afar, Earth looked much as it does today when the Neogene period began. But looks are deceiving. Mountains rose, and sea levels fell. The climate cooled and dried. Species were ...

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 ...