3 Authentic real fossil ammonite,from the Jurassic period 200 million years ago replaced with iron pyrite during the fossilization process polished on one side showing the pyrite and chambers.

Ammonites are an extinct group of marine invertebrate animals and as molluscs are more closely related to living squid,cuttlefish and calamari than they are to shelled nautiloids of today.The earliest ammonites appear during the Devonian, and the last species died out during the Cretaceous extinction event.The name "ammonite", from which the scientific term is derived, was inspired by the spiral shape of their fossilized shells, which somewhat resemble tightly coiled ram horns ("Horns of Ammon") because the Egyptian god Ammon was typically depicted wearing ram's horns.These particular ammonites are from North Africa near the Sahara desert Ammonites are the fossilized remains of squid-like animals which existed from 420 million years ago till the mass extinction at the end of the Cretaceous period, 65 million years ago. It is believed that the structure of the shell was strong enough to withstand water pressures down to 500 meters.The ammonite shell pattern is still seen today in shells of other mollusks.