Ammonite Sphenodiscus Lenticularis

Description

This beautiful ammonite is embedded in its rock matrix and shows glints of purple hue its its nacre and also shows beautiful complex suture patterning. There is another smaller specimen partially buried on the same side as the main ammonite, and a close look reveals many partial sections of the same fossil.

Dimensions Matrix: 160mm

Dimensions ammonite: 90mm

Genus: Sphenodiscus lenticularis 
Age: Upper Cretacious 145 to 66 million years ago

Locality: South Dakota, USA