3.4" Cretaceous Fish (Martinichthys) Rostra - Kansas
This is a rare, 3.4" long fossil rostra from a Martinichthys collected from the Smoky Hill Chalk in Gove County, Kansas. Martinichthys is a rare and rather mysterious fish whose remains have been found only in the Smoky Hill Chalk of Kansas. Little is actually known about this fish because there are only two partial skulls and few vertebrae found.
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.