Fossilised Gryphaea arcuata,or 'Devil's Toenail',from Jurassic Lower Lias at Hock Cliff,Gloucestershire,UK. This an extinct marine oyster with an exceptionally thick shell that lived in deep marine sediments. The Jurassic period extended from around 200 to 145 million years ago | |
Licence : | Droits gérés |
Crédit: | Science Photo Library / Stammers, Sinclair |
Taille de l’image : | 5993 px × 4000 px |
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