Promicroceras planicosta (Sowerby).
Flatstone. When opened up one half has a creamy white positive Ammonite and a negative. The other half has a dark brown Promicroceras positive with a negative. Very attractive specimen. NB SPECIMEN WEIGHS ALMOST 1 KILO.
Jurassic, Upper Sinemurian, Obtusum Zone.
Black Ven, Charmouth / Lyme Regis, Dorset.
Matrix : 10 x 10.5 cm.
