Field of small fossil ammonites with a single large one. Ammonites are extinct aquatic molluscs of the class Cephalopoda. They were abundant in the Mesozoic era, 225-65 millions years ago, & are commonly found in rock strata of that time. They were characterised by a coiled shell divided into many chambers, which acted as an aid to buoyancy. The ammonites died out in the mass extinction 65 million years ago, when the dinosaurs also disappeared.
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