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 today 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. When cut in half and polished they reveal the structure and are very appealing. Ammonite pairs are randomly chosen. Small measure approx. 1" Medium measure approx. 1" to 1.25" Large measure approx. 1.75"
