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Together with rays and skates, sharks form the class of cartilaginous fishes (Chondrichthyes). Fossil shark and ray teeth often take on the color of the surrounding sediment. Often they are black or gray. Shark teeth are quite hard, composed of calcium phosphates and fossilize well. A shark has a jaw which rotates in the course of time, and produces new teeth over and over again. Since each average shark produces more than 10,000 teeth during his lifetime, these fossils are abundant in Cretaceous and Paleogene deposits.
Shark teeth terminology. This is a Cosmopolitodus escheri (AGASSIZ, 1844).
Shark teeth terminology. This is a Notorynchus sp.
The skeleton consists of cartilage of which vertebrae are frequently found. In Heterodonts, the shape of the tooth varies, depending on the location in the jaw. So one Heterodont shark species always produced various types of teeth. In Homodonts all teeth all similar.
Photos or locations of Sharks at this site
Thanks to Erik Wijnker for making the images.
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