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.
Meet our Invertebrate Paleontologist
Learn about the Invertebrate Paleontology Collection at the Museum
Invertebrate Paleontology’s collection contains several noteworthy phyla, including Paleozoic trilobites, Mesozoic and Cenozoic crustaceans, lower Carboniferous brachiopods, Paleozoic gastropods, Paleozoic cephalopods, Paleozoic ophiuroids, and Pennsylvanian age eurypterids. The section also has more than 12,000 primary types and figured specimens.