4.75" Partial, Cretaceous Rudist (Durania) - Kansas
This is a 4.75" wide partial, fossil rudist of the species Durania maxima. If the entirety of this organism was present, it would be very large. They come from the Late Cretaceous Niobrara Formation (~83 million years) in Gove County, Kansas. Portions of the specimen have been stabilized with glue to increase integrity and longevity.
A rudist is a ring-shaped marine heterodont bivalve that arose during the Late Jurassic and died out near the end of the Cretaceous. Durania maxima rudists had heavy cone shaped shells, often with a large, circular collar, and are typically found in the lower 1/3 of the Smoky Hill Chalk.
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.