Rare Binatisphinctes (Okaites) subaurigerus Ammonite Fossil Callovian Jurassic Ryazan Russia with Certificate

Description

Rare Binatisphinctes (Okaites) subaurigerus Fossil Ammonite from Russia

This listing offers a rare and genuine Binatisphinctes (Okaites) subaurigerus Fossil Ammonite, dating to the Callovian stage of the Jurassic period, discovered in the fossil-bearing deposits of Ryazan, Russia. With its characteristic ribbing and elegant coiling, this specimen is a fine example of a Jurassic ammonite, representing a genus highly valued by both collectors and paleontologists for its importance in stratigraphy and evolutionary studies.

The photographs provided show the exact specimen you will receive, with a 1 cm scale cube included for precise size reference. Every fossil we supply is guaranteed 100% genuine and is accompanied by a Certificate of Authenticity.

Geological Age and Provenance

This ammonite comes from the Callovian stage of the Middle Jurassic, approximately 166 – 163 million years ago. The Callovian marks an important interval in ammonite evolution, with great diversity and wide geographic distribution across shallow seas. Fossil deposits around Ryazan in Russia are particularly renowned for their preservation of Middle Jurassic ammonites, providing a window into marine ecosystems that thrived nearly 165 million years ago.

These deposits were laid down in shallow epicontinental seas, where fine sedimentation created ideal conditions for fossilisation. The preservation of ammonites like Binatisphinctes subaurigerus makes these beds an important reference point for Jurassic paleontology.

Scientific Classification and Identification

This fossil is identified as Binatisphinctes (Okaites) subaurigerus, belonging to the family Perisphinctidae, within the superfamily Perisphinctoidea and order Ammonitida. Ammonites of the Perisphinctidae family are widely recognised for their ribbed shells and relatively evolute whorls, which provide excellent diagnostic features.

The subgenus Okaites and species subaurigerus are particularly significant within the Callovian ammonite record, acting as useful biostratigraphic markers. Specimens of this type are used by paleontologists to establish relative ages of sedimentary sequences, making them important in stratigraphic correlation studies.

Morphology and Distinctive Features

The morphological features of Binatisphinctes (Okaites) subaurigerus include:

• Evolute shell coiling, exposing the earlier whorls clearly.
• Strong, well-defined ribbing, crossing the whorls and often bifurcating from the umbilical edge.
• Compressed whorl section, giving the shell a refined, elongated appearance.
• Regular ornamentation, a defining trait of the Perisphinctidae family.

These features not only give the fossil visual appeal but also highlight evolutionary adaptations that allowed these ammonites to thrive in Jurassic seas as agile swimmers and efficient predators.

Depositional Environment

The Callovian seas of what is now Russia were shallow, warm marine environments teeming with life. Ammonites like Binatisphinctes subaurigerus coexisted with belemnites, bivalves, marine reptiles, and fish. Fine marine sediments in the Ryazan region allowed rapid burial of ammonite shells, preserving them with exceptional clarity and detail. Such fossils provide vital insights into paleoecology and Jurassic biodiversity.

Collectible and Scientific Importance

Specimens of Binatisphinctes (Okaites) subaurigerus are valued for their rarity, their aesthetic qualities, and their importance in biostratigraphy. For collectors, they represent a striking display fossil, with their ribbed shells and elegant symmetry. For paleontologists, they are key reference species for the Middle Jurassic Callovian stage, making them critical in global stratigraphic studies.

Owning such a specimen offers the opportunity to preserve a piece of Earth’s history from a period when ammonites were among the dominant marine invertebrates.

Key Features of This Fossil

• Rare Binatisphinctes (Okaites) subaurigerus ammonite from Ryazan, Russia
• Middle Jurassic (Callovian stage), approx. 166 – 163 million years old
• Member of the Perisphinctidae family, with strong ribbing and evolute coiling
• Important index fossil used in Callovian biostratigraphy
• Supplied with a Certificate of Authenticity
• The exact specimen pictured is the one you will receive

This Binatisphinctes (Okaites) subaurigerus Fossil Ammonite is an exceptional example of a Jurassic ammonite, combining scientific importance, rarity, and striking natural beauty, making it a superb addition to any fossil collection.