06104 - Top Quality Pyritized 1.39 Inch Unidentified Lower Cretaceous Ammonites Mammites nodosoides Beautiful preserved specimen

Beautiful preserved specimen

Altaesajania

its excellent preservation is something much more difficult to find

each tooth had one barb

Magnificent specimen with detailed preservation

06104 - Top Quality Pyritized 1.39 Inch Unidentified Lower Cretaceous Ammonites Mammites nodosoides Beautiful preserved specimenSpecimen of extreme quality. Unidentified species. His suture lines are wonderfully well detailed. It is naturally pyritized. It has undergone a taphonomic process of permineralization in Iron Sulfide (Pyrite). Permineralization is a process of fossilization in which mineral deposits form internal casts of organisms.