Shark tooth fossil, SEM

Shark tooth fossil, SEM

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Credit: STEVE GSCHMEISSNER/SCIENCE PHOTO LIBRARY

Caption: Shark tooth fossil, coloured scanning electron micrograph (SEM). Sharks are predatory fish that first evolved in the Palaeozoic Era (570-245 million years ago). They now dominate present-day seas. Few fossilised remains of prehistoric sharks exist 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. Magnification: x14 when printed 10cm high.

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Keywords: animal, animals, aquatic, carnivore, coloured, fish, fossil, fossil vertebrate, fossilised, fossils, marine, palaeontological, palaeontology, paleontology, predator, scanning electron micrograph, sem, shark, sharp, tooth, vertebrates, vertical

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