STEVE GSCHMEISSNER / SCIENCE PHOTO LIBRARY STEVE GSCHMEISSNER / SCIENCE PHOTO LIBRARY
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.
Model release not required. Property release not required.