English: Photograph of the ammonite Asteroceras obtusum from the Jurassic Lower Lias Formation, Obtusum Zone. Locality - Lyme Regis, Dorset, England. Complete calcified specimen, measuring 11.5 cm (4.5") in diameter, in limestone matrix.
{{en|Photograph of the ammonite ''Asteroceras obtusum'' taken by Dlloyd. The specimen is from the Jurassic Lower Lias Formation, Obtusum Zone. Locality - Lyme Regis, Dorset, England. Complete calcified specimen, measuring 11.5 cm (4.5") in diameter, in li