Ammonites: Signs of Life
Ammonites are named after the Egyptian God Ammon, who had a ram's horn behind each ear. Ammonites' shells were similarly coiled, divided into air chambers which provided buoyancy and allowed them to control the depth at which they swam. It is thought they swam using jet propulsion, much as the chambered nautilus does today. Ammonites lived between 400 and 65 million years ago; they were cephalopods, related to the squid, octopus, and cuttlefish, not only the nautilus. Fossils of the ammonites can be found all over the world. Through the lens of a camera, patterns of mineralization become clear and represent the varied stories of these long-ago denizens of the sea.