Helicoprion, whorl-tooth shark #464 cast replica Dinosaur Tracks rex tooth from the Hell's

rex tooth from the Hell's Creek formation

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*If plaster is unavailable we may substitute a resin cast (at no additional charge)

Helicoprion, whorl-tooth shark #464 cast replica Dinosaur Tracks rex tooth from the Hell'sHelicoprion, whorl tooth shark #464 Helicoprion ("Spiral Saw") was a long lived genus of shark like cartilaginous fish that first arose in the oceans of the late Carboniferous, survived the Permian Triassic Extinction Event, and eventually went extinct during the early Triassic. 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 the skull of a