Description
Rare Hybodont Shark Spine Fossil – Middle Jurassic Great Oolite Group
This rare and highly collectable Hybodont shark spine fossil originates from the Great Oolite Group of Ketton Quarry, dating to the Middle Jurassic Bathonian stage (approximately 168–166 million years ago). Hybodont sharks, belonging to the Order Hybodontiformes, were a dominant and widespread group of early sharks that thrived in Jurassic seas. Fossilised fin spines are significantly rarer than teeth, making this an exceptional and desirable specimen for collectors and enthusiasts of prehistoric marine life.
This fossil is a genuine specimen and includes a Certificate of Authenticity with a lifetime guarantee. The piece has been carefully selected for its quality and preservation, and the photograph provided shows the exact specimen you will receive.
Geological Setting – Great Oolite Group, Ketton Quarry
The Great Oolite Group represents a sequence of shallow marine limestones deposited across southern and central England during the Middle Jurassic. The Bathonian stage is characterised by warm, tropical conditions, with extensive carbonate platforms forming in shallow epicontinental seas.
Ketton Quarry is a classic locality within this formation, known for its richly fossiliferous limestone deposits. These sediments accumulated in low-energy marine environments such as lagoons, shoals, and open shelf settings. Fine carbonate muds and bioclastic material contributed to excellent fossil preservation, capturing a diverse assemblage of marine organisms including ammonites, bivalves, echinoderms, and early sharks.
Fossil Identification – Hybodontiform Shark Spine
This specimen represents a dorsal fin spine from a hybodont shark, an extinct lineage of cartilaginous fish that existed from the Devonian through to the end of the Cretaceous. Hybodont sharks are classified within the Superfamily Hybodontoidea and are distinguished by their robust fin spines and distinctive dentition.
The spine exhibits classic hybodont morphological characteristics:
- Elongated and gently curved structure
- Tapering profile toward the distal end
- Surface ornamentation consisting of fine longitudinal ridges
- Dense, mineralised composition reflecting dermal dentine
These spines were positioned anterior to the dorsal fins and likely served both as structural support and a defensive adaptation against predators. Their rarity in the fossil record is due to lower preservation potential compared to teeth, enhancing the significance of this piece.
Palaeoenvironment and Marine Ecosystem
During the Bathonian, the region that is now Rutland was submerged beneath a shallow, warm sea teeming with life. Hybodont sharks occupied an important ecological role as mid-level predators and opportunistic feeders. Their diet likely included small fish, crustaceans, and shelled invertebrates, supported by their versatile dentition.
The Great Oolite seas hosted a rich marine ecosystem, including ammonites used for biostratigraphic zonation, alongside marine reptiles and abundant invertebrate fauna. The presence of hybodont remains contributes valuable insight into the biodiversity and trophic dynamics of Jurassic marine environments.
Condition, Authenticity and Display Appeal
This Hybodont shark spine fossil has been carefully chosen for its preservation, detail, and visual appeal. It retains natural geological textures and features, making it both scientifically interesting and aesthetically striking.
- Genuine Hybodont shark spine fossil
- Middle Jurassic (Bathonian), Great Oolite Group, UK
- Includes Certificate of Authenticity with lifetime guarantee
- Exact specimen shown in photographs is supplied
- Ideal for collectors, educational use, or display
Please refer to the images for full sizing and scale. This rare fossil offers a unique opportunity to own a genuine piece of Jurassic marine history, representing an ancient lineage of sharks that once thrived in prehistoric oceans.
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