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 Pyritised ammonite is a fossilised shell of an extinct marine mollusk, preserved through a process where the original organic material has been re...

A pyritised ammonite is a fossilised shell of an extinct marine mollusk, preserved through a process where the original organic material has been r...

Ammonites are ancient marine fossils that first appeared over 240 million years ago, descending from straight-shelled cephalopods known as bacrites...