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 .
Large well-known fossils excavated from the Smoky Hill Chalk include marine reptiles such as plesiosaurs , large bony fish such as `` Xiphactinus '' , mosasaurs , pterosaurs ( namely `` Pteranodon '' ) , flightless marine birds such as `` Hesperornis '' , and turtles .