Goronyosaurus nigeriensis is a species of crocodile-like mosasaur from the Late Cretaceous (Maastrichtian) of Sokoto State, Niger and northwestern Nigeria.
Near the coast of the Bentiaba desert have been found Late Cretaceous fossils of sharks, turtles, mosasaurs, plesiosaurs and sauropods.
Large well-known fossils excavated from the Smoky Hill Chalk include marine reptiles such as plesiosaurs, large bony fish such as Xiphactinus, mosasaurs, flying reptiles or pterosaurs (namely Pteranodon), flightless marine birds such as Hesperornis, and turtles.