This particular specie has not big ribs as the normal ones. The last whirl is flattened.

Name : Arietites aff. nudaries
Age : Jurassic, Sinemurian stage
Findspot : Near Chalons sur Saône, France

The ammonite has a size of 32.5 cm and a weight of 8.6 kg. Few cracks may have been filled and back side has not been cleaned.