Learn about the time period that took place 23 to 2.6 million years ago. 3 min read From afar, Earth looked much as it does today when the Neogene period began. But looks are deceiving.

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 ...