88679 - Beautiful Pyritized Polished Secction 2.50 Inch Unidentified Ammonite Cretaceous Ophiura These mineralizations are responsible for

These mineralizations are responsible for the wide range of beautiful reddish color tones

are oriented posteriorly since their origin and the lingual margin is curved

The cow sharks are considered the most primitive ones because they preserve a skeleton anatomy very similar to the ancient and first types of sharks

Great preservation

in the bottoms of lakes

88679 - Beautiful Pyritized Polished Secction 2.50 Inch Unidentified Ammonite Cretaceous Ophiura These mineralizations are responsible forImpressive example of this Cretaceous cephalopod. It is polished. The structures are easily visible. It has undergone a taphonomic process of permineralization in Iron Sulfide (Pyrite). Nice specimen.