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We are suppliers of Fossil stones Natural Ammonite. Available in different sizes,forms & colours,dont hesitate to contact us Ammonites as they pertain specifically to the order Ammonitida, are an extinct group of marine animals belonging to the cephalopod subclass Ammonoidea. . They are excellent index fossils , and it is often possible to link the rock layer in which they are found to specific geological time periods . The closest living relative of the Ammonitida, is not the modern Nautilus which they somewhat outwardly resemble, but rather the subclass Coleoidea ( octopus , squid , and cuttlefish ). Their fossil shells usually take the form of planispirals, although there were some helically-spiraled and non-spiraled forms (known as "heteromorphs"). Their name came from their spiral shape as their fossilized shells somewhat resemble tightly-coiled rams ' horns. Pliny the Elder (d. 79 A.D. near Pompeii) called fossils of these a