A must for the ammonite collector. This book deals with the last scaphitid ammonites from the Western Interior of North America. Although quite technical, this is the only publication which identifies and describes the fabulous scaphite fauna of the Fox Hills Seaway. It also discusses the ontogeny (different maturity stages) of the scaphites, including how the sex of an ammonite is determined.
Ammonites and the Other Cephalopods of the Pierre Seaway - Book
Cephalopods Present and Past - Book
Phylogeny and Evolution of the Mollusca