Shark tooth fossil,SEM

Numéro d’image : 11743638
Shark tooth fossil,SEM
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
Licence : Droits gérés
Crédit: Science Photo Library / Gschmeissner, Steve
Taille de l’image : 2400 px × 3005 px
Model Release : Non requis
Property Release : Non requis
Restrictions : -

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