Asteroceras confusum Spath with Promicroceras planicosta Sowerby.
Grey limestone matrix. On one surface there is a beautifully preserved 3D calcitic Asteroceras with part of the shell of the outer whorl missing. As the remainder of the shell after the damage is perfect this would suggest a bit mark from a predator as the cause of the damage. Lying next to the Asteroceras is a beautiful calcitic Promicroceras.
Jurassic, Upper Sinemurian, Obtusum Zone.
Black Ven, Charmouth / Lyme Regis, Dorset.
Asteroceras : 3.6 cm diam.