Promicroceras planicosta (Sowerby) with Xipheroceras dudrieseri (Sowerby)
Small piece of grey limestone with a dark coloured Ammonite on one surface and a light coloured Ammonite on the other side.
Jurassic, Upper Sinemurian, Obtusum Zone.
Black Ven, Charmouth / Lyme Regis Dorset.
Matrix : 10 x 8 cm.
