Stephanoceras gibbosum (S. Buckman)
Base cut free standing specimen. Developed to the centre on one side. Lovely display piece. Thick ribbing and umbilical nodes. From a famous old locality. A 'beauty'.
Jurassic, Bajocian, Humphriesianum Zone, Gibbosum subzone.
Oborne Wood, Sherborne, Dorset.
Ammonite : 9 cm diam.