06341 - Beautiful Pyritized 1.66 Inch Unidentified Lower Cretaceous Ammonites Mammites nodosoides Unique and extremely rare specimen

Unique and extremely rare specimen

we have much of the proximal area of the vertebral column of this huge crocodile

It is a tooth of the upper jaw of a cow shark

See also Arkell et al

It preserves its lateral serrations very well defined

06341 - Beautiful Pyritized 1.66 Inch Unidentified Lower Cretaceous Ammonites Mammites nodosoides Unique and extremely rare 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.