Asteroceras confusum Spath. with Promicroceras planicosta (Sowerby)
Beautifully preserved Asteroceras on grey limestone with a fine Promicroceras.
Jurassic, Upper Sinemurian, Obtusum Zone.
Black Ven, Charmouth / Lyme Regis, Dorset.
Asteroceras : 3 cm diam.
