GEOFF KIDD / SCIENCE PHOTO LIBRARY GEOFF KIDD / SCIENCE PHOTO LIBRARY
Fossil shark tooth (Carcharias africana). Example of the tooth of this Eocene (60mya - 32mya) shark which is related to modern day Grey Nurse Sharks. The thin pointed shape of the tooth indicates a diet primarily of bony fish. Sharks first evolved in the Palaeozoic era (570-245 million years ago). Shark's skeletons are formed of cartilage, a less durable material than bone, consequently there are few fossils of prehistoric sharks. Their teeth are made of a bone-like, enamel-coated substance that is more readily fossilised.
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