Stephanoceras (Normannites) antiquum (West).
perfect 3D specimen on base cut matrix of oolitic Limestone. from an old collection. Comes from the famous fossil locality of Frogden Quarry. This is now an SSSI with protected status. Frogden Ammonites are just about impossible to obtain except from old collections.
Jurassic, Bajocian, Humphriesianum Zone.
Frogden Quarry, Sherborne, Dorset.
Ammonite : 3 cm. diam.