Shark tooth fossils

Shark tooth fossils

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Caption: Shark tooth fossils. Collection of fossils of shark teeth. Sharks are predatory fish that first evolved in the Palaeozoic era (570-245 million years ago). They dominate today's seas. There are few fossils of prehistoric sharks, because their skeletons were formed of cartilage, a less durable material than bone. Shark teeth are made of a bone-like, enamel-coated substance that is more readily fossilised. Some of the ancient sharks reached enormous sizes and had teeth reaching over 17 centimetres in length.

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Keywords: animal, animals, biological, biology, enamel, extinct, fish, fossil, fossilised, fossilized, mineralised, nature, palaeontological, palaeontology, paleontological, paleontology, prehistoric, prehistory, preserved, rock, shark, teeth, tooth, zoological, zoology

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