07534 - Beautiful Pyritized 0.49 Inch Olcostephanus sp Lower Cretaceous Ammonites KemKem_Beds_Fish_Assemblage a few miles south-east of

a few miles south-east of Ouzina

The opaque minerals represent the 17 % of the sample composed mostly of iron

This species is always characterized by a masticatory surface almost flat with no crests

The Ancyloceratina were a diverse suborder of ammonite most closely related to the ammonites of order Lytoceratina

07534 - Beautiful Pyritized 0.49 Inch Olcostephanus sp Lower Cretaceous Ammonites KemKem_Beds_Fish_Assemblage a few miles south-east ofOlcostephanus sp, Neumayr (1875) Ammonite Cephalopoda Ammonoidea Olcostephanidae 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.