Seamonsters - A Prehistoric Adventure

cretoxyrhina_teeth-ga.jpg

During the Age of Dinosaurs - the Mesozoic era's Triassic, Jurassic, and Cretaceous periods - large reptiles ruled the prehistoric Earth. They roamed the land but also prowled the open oceans and inland seas. By the end of the Mesozoic, however, many of these sea monsters were extinct and new animals began to populate the planet.

Link