Fossil shark vertebrae. Fossilised vertebrae (spinal column elements) from ancient sharks. Sharks are predatory fish that first evolved in the Palaeozoic era (245-570 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. Some species are known only from their durable,enamel-coated teeth. Found in Blackheath Beds,Abbey Wood,Kent,UK | |
Lizenzart: | Lizenzpflichtig |
Credit: | Science Photo Library / Stammers, Sinclair |
Bildgröße: | 5056 px × 3481 px |
Modell-Rechte: | nicht erforderlich |
Eigentums-Rechte: | nicht erforderlich |
Restrictions: | - |