Cephalopods are marine and predaceous. The cephalopods occur in the fossil record from the late Cambrian to the Recent. The cephalopods are divided into six primary orders. The chambered nautilus of poesy fame is a living representative of the nautiloids, but the group was best represented in the Paleozoic. The fossil record stretches from the Cambrian to the Recent.
Ammonites are some of the most fascinating fossils to be found and are incredibly diverse.
Ammonites are found in the fossil record from the Devonian to the Cretaceous. There are no living representatives. Ammonites are divided into three basic groups based on the type of sutures on the outside of the shell. Goniatites have a relatively simple, undulating sutures. The drawing at the top of the page is a goniatite ammonite.