Black Ammonite shells

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Ammonite fossils come from marine animals belonging to a phylum of Mollusks and the Class Cephalopods. They had a coiled shell. The Ammonites were like the modern-day octopus but t oday the octopus have lost their shell. Ammonites evolved some 416 million years ago and were once one of the most abundant animals of the Paleozoic seas. The creature lived within the shell which formed into a spiral. The spiral was made up of ever-increasing chambers. Within the chambers was a structure called a siphuncle which allowed the ammonite to pump air into the chambers allowing it to remain buoyant as it swam. Each shell measures 1" and is randomly chosen. Show more