Fossil Lytoceras cornucopiae (late Toarcian - 178 MA) from Belmont-d'Azergues, Arrondissement of Villefranche-sur-Saône, Department of Rhône, Auvergne-Rhône-Alpes, France (1988). Comes with certificate of authenticity. Average weight (Carats): 12772.0 ct (2.5 kg). Dimensions (mm): 210 x 125 x 75 mm. Ref. : SKU039900. A fossil is the mineralized trace of an ancient living organism, preserved in a sedimentary rock.