Marine Reptiles

Ichthyosaurs Turtles Sea Turtles Mosasaurs Mosasaur Mosasauridae Plesiosauria Mosasaurus Caretta caretta

Mosasaur Tooth Shows Bus-Sized Marine Reptiles Hunted in Cretaceous Rivers

Isotope data from the Hell Creek find point to a late-Cretaceous freshening of the Western Interior Seaway that drew marine predators into river habitats.