Ammonite Sphenodiscus Lenticularis

Description

This is not only a fabulous example of this ammonite, its also a densely packed cluster of many kinds of cephalopods. The main ammonite features clear suture and intact mother of pearl glowing a purple iridescence. The surrounding matrix including the reverse shows many mother of pearl impressions of ammonite and bi-valves. 

Dimensions Matrix: 150mm

Dimensions ammonite: 90mm

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

Locality: South Dakota, USA