2.2" Cretaceous Swordfish (Protosphyraena) Hypural - Kansas

Protosphyraena is a fossil genus of swordfish-like marine fish that had a worldwide distribution during the Upper Cretaceous Period. It was a large fish, averaging 2–3 meters in length. It shared the Cretaceous oceans with aquatic reptiles such as mosasaurs and plesiosaurs, as well as with many other species of extinct predatory fish. Though fossil remains of this taxon have been found in both Europe and Asia, it is perhaps best known from the Smoky Hill Member of the Niobrara Chalk Formation of Kansas.

The Smoky Hill Chalk Member of the Niobrara Chalk formation is a Cretaceous conservation Lagerstätte, or fossil-rich geological formation, known primarily for its exceptionally well-preserved marine reptiles. It outcrops in parts of northwest Kansas--its most famous localities for fossils--and in southeastern Nebraska. Large, well-known fossils excavated from the Smoky Hill Chalk include marine reptiles such as plesiosaurs, large bony fish such as Xiphactinus, mosasaurs, pterosaurs, and turtles.