07531 - Top Quality Pyritized 0.98 Inch Unidentified Lower Cretaceous Ammonites Dinosaur Age Mammals Applied Petrology Laboratory (APPLIED PETROLOGY

Applied Petrology Laboratory (APPLIED PETROLOGY LABORATORY

They come from the famous sites of the Judith River Formation in Montana (Campanian stage

This is a complete vertebra of this very rare giant fish of filter feeder diet

Anetoceras elegantulum

07531 - Top Quality Pyritized 0.98 Inch Unidentified Lower Cretaceous Ammonites Dinosaur Age Mammals Applied Petrology Laboratory (APPLIED PETROLOGYSpecimen 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.