These fantastic specimens make for a stunning and unusual room display. Perfect non-jewellery gift! Roaming the oceans as far back as 200 million years ago, these squid-like sea creatures are fossilised relatives of the chambered nautilus shell. The name "ammonite" was inspired by the spiral shape of the fossilised shells, which somewhat resemble tightly coiled rams' horns. It is thought the name derived from the Greek God Ammon, who is typically depicted wearing rams horns.