Helicoprion, whorl-tooth shark Dimorphodon Cleveland-Lloyd Quarry

Cleveland-Lloyd Quarry

This giant Isotelus trilobite is from the Ordovician of southern Ohio

) and possibly snakes

strong flippers

plus first

Helicoprion, whorl-tooth shark Dimorphodon Cleveland-Lloyd QuarryHelicoprion ("Spiral Saw") was a long lived genus of shark like cartilaginous fish that first arose in the oceans of the late Carboniferous 280 million years ago, survived the Permian Triassic Extinction Event, and eventually went extinct during the early Triassic some 225 million years ago. The only fossils known are the teeth, which were arranged in a fantastic "tooth whorl" strongly reminiscent of a circular saw. It was not until the discovery of