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Ammonites ( Ammonoidea class of cephalopod molluscs) of the Dactyloceras genus, are typical of the end of the Early Jurassic Period (Toarcian, 172 million years ago ), coming from Germany. Due to its vast geographic distribution and the great variety of species, Ammonites are among the best fossil-guides for the Late Paleozoic Period and the Mesozoic Period (360-65 million years ago). The class of Ammonites appeared in the Paleozoic Period and disappeared at the end of the Cretaceous Period (65 million years ago). The present day organisms that are most similar to ammonites are the cephalopods of the Nautilus genus. Photograph by Paola Tognini

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