05217 - Beautiful Pyritized 0.63 Inch Phylloceras Lower Cretaceous Ammonites Pterosaur Bones 1 huge phalanx and 1

1 huge phalanx and 1 metacarpal are visible

16 Inch = 4

with an inflated posterior surface

Class: Iron

The base of this specimen has been cast in a process of "mummification" similar to that carried out in paleontological excavations to recover large specimens on matrix with the least possible damage

05217 - Beautiful Pyritized 0.63 Inch Phylloceras Lower Cretaceous Ammonites Pterosaur Bones 1 huge phalanx and 1Specimen of extreme quality. 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.