88679 - Beautiful Pyritized Polished Secction 2.50 Inch Unidentified Ammonite Cretaceous Ophiura as the Atlantic ocean was

as the Atlantic ocean was widening

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

Great preservation

with clean white

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

88679 - Beautiful Pyritized Polished Secction 2.50 Inch Unidentified Ammonite Cretaceous Ophiura as the Atlantic ocean wasImpressive 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.