While dinosaurs ruled the land, amazing creatures resided in the sea in the Age of Dinosaurs. Step into an underwater world in Cretaceous Seaway, a unique exhibition hall that features gentle giants and fierce predators that lived underwater.

The hall brings to life the Western Interior Seaway, a shallow ocean that existed in the Midwestern United States 80 million years ago. Visitors can examine the fossils of a giant turtle or see a dramatic chase scene where a plesiosaur is in pursuit of a prehistoric diving bird. Look up, and see the king of the seaway—a 40-foot mosasaur swimming above.

Adjacent to Dinosaurs in Their Time, Cretaceous Seaway is an extension of our blockbuster core exhibition that shows the diversity of life during the Cretaceous Period.