Promicroceras planicosta Sowerby.
Base cut free standing piece of grey limestone with a 3D calcitic Promicroceras at either end. When displayed upside down ( still free stands) it bears a resemblance to a frogs head ! Cute.
Jurassic, Upper Sinemurian, Obtusum Zone.
Black Ven, Charmouth / Lyme Regis, Dorset.
Specimen : 17 cm long.
