A partial Ammonite fossil.
One of the chamber is stained.

 

Category : Ammonites
Species name : Lamberticeras lamberti
Age : Middle Jurassic (175.6-161.2Ma)
Locality : Volga River, Saratov, Russia
Image width : 51.8mm
Specimen provided by : Tohoku University
CT data provided by : Tohoku University Museum
View type : Chamber extracted