Leioceras opalinum (Reinecke)
Zonal index species for the lower Aalenian. This is the first ever black example I have seen out of hundreds of examples. Normally pale brown or creamy brown colour. A real 'one off'.
Jurassic, Lower Aalenian, Opalinum Zone.
Burton Bradstock, Dorset.
Ammonite : 3.8 cm diam.
