RARE Amoeboceras Prionodoceras Fossil Ammonite Lower Oxfordian Jurassic Russia – Genuine Authentic Prehistoric Marine Cephalopod with COA

Description

Rare Lower Oxfordian Ammonite from the Volga Region, Russia

This listing features a rare Amoeboceras (Prionodoceras) fossil ammonite from the Lower Oxfordian stage of the Late Jurassic period, discovered in the fossil-rich deposits along the Volga River, Russia. This specimen has been carefully chosen for its excellent preservation, distinct morphological features, and scientific value. The photographs provided show the exact fossil you will receive, ensuring complete authenticity and transparency for collectors.

Geological Age & Formation

Amoeboceras (Prionodoceras) lived approximately 163.5 to 161.2 million years ago during the Lower Oxfordian stage of the Late Jurassic. At this time, the Volga region was covered by a shallow epicontinental sea connected to the Tethys Ocean. The calm marine conditions, combined with fine-grained sedimentation, created an ideal environment for the preservation of delicate ammonite shells. Fossils from this area are renowned for their exceptional detail, and Amoeboceras species are particularly important in stratigraphic studies of the Jurassic period.

Species Identification & Morphology

Belonging to the family Cardioceratidae within the superfamily Perisphinctoidea and order Ammonitida, Amoeboceras (Prionodoceras) is characterised by a small to medium-sized, involute shell with fine, closely spaced ribbing. The ribs often bifurcate towards the outer whorl and run continuously over the venter. The whorl section is compressed, and the overall shell form is streamlined for active swimming.

The suture lines—highly intricate folded patterns marking the junctions between internal chambers—are a key identification feature and are often very well-preserved in specimens from the Volga region. These patterns not only provide taxonomic information but also enhance the aesthetic appeal of the fossil.

Collector Highlights

• Preservation: Exceptional, with sharp ribbing, well-defined whorl form, and visible suture patterns.
• Authenticity: Guaranteed 100% genuine fossil, supplied with a Certificate of Authenticity.
• Provenance: Volga River region, Russia – Lower Oxfordian, Late Jurassic.
• Display Quality: Attractive, scientifically important specimen suitable for both display and study.
• Rarity: Amoeboceras (Prionodoceras) from this locality is highly sought after due to its significance in biostratigraphy and limited availability.

Paleoenvironment & Scientific Importance

During the Lower Oxfordian, Amoeboceras (Prionodoceras) thrived as a nektonic predator, hunting small crustaceans, mollusks, and other invertebrates. The chambered phragmocone allowed for precise buoyancy control, enabling the animal to move efficiently between different depths of the water column.

This genus is a key index fossil for the Lower Oxfordian, widely used by paleontologists to identify and correlate rock layers across different regions. Its distinctive ribbing, compressed shell shape, and consistent occurrence in specific strata make it an invaluable tool in Jurassic stratigraphy. Fossils from the Volga outcrops have been studied extensively due to their abundance, excellent preservation, and importance in understanding Late Jurassic marine ecosystems.

A Striking and Scientifically Valuable Fossil

This Amoeboceras (Prionodoceras) specimen is more than just a beautiful display piece—it represents a snapshot of life in the ancient Jurassic seas of what is now Russia. Its rarity, geological significance, and superb preservation make it an outstanding addition to any serious fossil collection, whether for scientific reference, educational purposes, or personal enjoyment.

All of our fossils are 100% genuine specimens and come with a Certificate of Authenticity. The fossil pictured is the exact specimen you will receive.