This tooth is from an extinct species of sandtiger shark which was common in the tertiary period, about 34 million years ago. Teeth are usually the only fossil remains from sharks because they fall out when broken or worn.
Shark teeth are the most common type of fossil for a number of reasons. First, shark teeth, like most teeth, are made of dentin, a hard calcified tissue that does not easily decompose. Dentin is harder and denser than bone. In a tooth, the dentin is surrounded by a very hard enamel shell. Secondly, to maintain a sharp smile, shark teeth are designed to regularly fall out and be replaced.
No two pieces are alike. Each one will slightly vary in size, shape and colour.
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