Pathologically Deformed Gagaticeras

This Gagaticeras ammonite had some type of injury or disease that caused very unusual growth in its upper whorl. 

This is a rarer found lower lias ammonite, prepared using an airabrader to remove the rock. 

Gagaticeras Gagateum
200 Million Years old
Upper Sinemurian, Oxynotum Biozone,
Boggle Hole