Trace fossil. Mould of external surface.
Very few Ammonite fossils have been found with remains of food inside them but from the evidence available it seemed they were carnivores (meat eaters), eating fish,other molluscs, and plankton. It caught its food with its tentacles and It had a strong mouth capable of crushing shell. Tooth marks found on some fossil shells of Ammonites indicate that they were preyed upon by marine reptiles. It propelled itself backwards through the water with squid like tentacles that came out of its shell. The spiral shell was divided into chambers and the creature lived only in the outermost chamber. The other chambers were filled with gas or water to control buoyancy, rather like a submarine.
