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Rays and Sharks belong to the class of cartilaginous fishes (Chondrichthyes). Rays are classified into Batoidea, along with skates. Ray teeth become usually black, like shark teeth, as they fossilize. Ray teeth can be identified by the rectangular shape with ridges. Rays have a cartilaginous skeleton that rarely becomes fossilized. The teeth are common fossils because they are not made ??of cartilage.
Example of a Ray teeth from Cadzand, The Netherlands.
Photos or locations of Batoidea at this site
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