ASTRID & HANNS-FRIEDER MICHLER / SCIENCE PHOTO LIBRARY ASTRID & HANNS-FRIEDER MICHLER / SCIENCE PHOTO LIBRARY
Fossilised Jurassic ammonite of genus Orthosphinctes. This genus was to be found in the Jurassic Period (195-140 million years before present). Ammonites belong to the Class Cephalopoda, marine molluscs characterised by bilateral symmetry, distinct head and a mouth region surrounded by tentacles. The last ammonites became extinct in the Upper Cretaceous Period, about 65 million years ago. Similar creatures, but belonging to a different sub-class, may still be found today as the genus Nautilus. This fossil was found near Geisingen, Germany.
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