Information about the biology of ammonoids from The Cephalopod Page.

An article in Paleontographic Electronica.

Modelling ammonite ribs and sutures.

A pictorial guide to some of the fossil cephalopods that can be found in the State of Utah, mostly Ammonoids, but many other cephalopods are pictured. Pictures of some collecting localities are also included.

Systematic collection of fossil cephalopoda with ammonites of typical faunas. Also includes myths and legends about ammonites.

Ammonites at the Black Hills Institute