Dead ammonites on seabed, illustration

Numéro d’image : 12450886
Dead ammonites on seabed, illustration
Dead ammonites on seabed, illustration. Ammonites, now extinct, were marine invertebrate molluscs with a spiral shell. Most were less than 20 centimetres across. Ammonites first appear in the fossil record around 400 million years ago and became extinct at the end of the Cretaceous Period 65 million years ago. The process of fossilisation begins as sediment covers the dead ammonites on the seabed. If the conditions are right for fossilisation, the structure and anatomy of the ammonites will be preserved for millions of years as the sediments form rocks.
Licence : Droits gérés
Crédit: Science Photo Library / JOHN SIBBICK
Taille de l’image : 8176 px × 4304 px
Model Release : Non requis
Property Release : Non requis
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