Xipheroceras dudressieri d'Orbigny.
Beautifully preserved calcitic Ammonite on small pedestal of grey limestone. Developed to the centre on one side and showing fine umbilical spines.
Jurassic, Upper Sinemurian, Obtusum Zone.
Black Ven, Charmouth / Lyme Regis, Dorset.
Ammonite : 5 cm diam.
