The shape of this type of ammonite, with its sharp edge, would have offered minimum water resistance. It is thought to have been one of the fastest swimmers of all the ammonites.
These ammonites were probably found in the Black Ven Marls. They were found by Barney Hansford who lived in Charmouth. Between the 1950s and the 1970s, he built up a large collection of local fossils and displayed them in Barney’s Fossil Exhibition in Charmouth. After his death in the late 1980s the collection was broken up, but some specimens found their way to Bridport Museum’s collection.
Find out more about ammonites on the molluscs pages.