Asteroceras obtusum (Sowerby)
Very attractive brown calcite Ammonite. Developed to centre one side. Nice sutures under magnification. Zonal index species.
Jurassic, Upper Sinemurian, Obtusum Zone.
Black Ven, Charmouth /Lyme Regis, Dorset.
Ammonite : 4.5 cm diam.
