Asteroceras obtusum (Sowerby) & Promicroceras planicosta (Sowerby)
Base cut triangular shaped piece of grey limestone. With 2 well preserved calcitic Ammonites.
Jurassic, Upper Sinemurian, Obtusum Zone.
Black Ven, Charmouth, Dorset.
Matrix : 11 x 6.5 x 2 cm.
