Description
Rare Pliosaur Paddle Humerus Bone Fossil with Predation Bite Marks
This very rare fossil specimen is a pliosaur paddle humerus bone from the Oxford Clay Formation, Jurassic, Peterborough, UK. It is an exceptional British marine reptile fossil, made especially interesting by the presence of predation bite marks. These marks add an important behavioural and palaeontological feature, giving the specimen a direct connection to predator-prey interaction within the Jurassic seas.
Pliosaurs were powerful marine reptiles belonging to the broader plesiosaur group. Unlike long-necked plesiosaurs, pliosaurs typically had large heads, strong jaws, short necks and robust bodies. Their limbs were modified into strong paddle-like flippers, used for swimming through the ancient Jurassic seas. A humerus bone formed part of the front paddle structure, making this specimen a significant skeletal element from one of the most impressive marine predators of the Jurassic Period.
Geological Location and Age
This fossil comes from the Oxford Clay Formation, Jurassic, Peterborough, UK. The Oxford Clay is one of Britain’s most famous Jurassic fossil deposits and is particularly well known for producing marine reptile remains, ammonites, belemnites, fish, crustaceans, bivalves and other marine fossils. The Peterborough area has long been associated with important Oxford Clay fossil discoveries, especially from historic clay pit exposures.
The Oxford Clay Formation dates mainly to the Middle Jurassic, particularly the Callovian stage, approximately 166 to 163 million years old. During this time, much of what is now eastern England was covered by a warm, shallow epicontinental sea. Fine clay-rich sediment accumulated on the sea floor, creating excellent conditions for preserving bones, shells and other remains of marine life.
Pliosaur Humerus and Paddle Anatomy
This fossil represents a humerus from the paddle of a pliosaur. In marine reptiles such as pliosaurs, the limb bones were adapted for life in water. The humerus was a strong upper limb bone that formed part of the front flipper, helping support the broad paddle used for propulsion and manoeuvring. These powerful paddles allowed pliosaurs to move effectively through the water as active predators.
Pliosaur limb bones are generally more massive and robust than those of many smaller marine reptiles, reflecting the strength required for swimming and controlling movement in open water. The preservation of a paddle element such as a humerus provides an important glimpse into the anatomy and lifestyle of these Jurassic marine reptiles.
Predation Bite Marks and Scientific Interest
The predation bite marks on this pliosaur paddle humerus are a highly notable feature. Bite marks on fossil bone can indicate scavenging, attack, feeding behaviour or interaction with other marine predators. In the Oxford Clay sea, large marine reptiles, sharks and other predators occupied the ecosystem, and bones showing bite damage are especially desirable because they record evidence of ancient behaviour rather than just anatomy.
These marks make the fossil particularly appealing for collectors interested in palaeopathology, predator-prey evidence, Jurassic marine ecosystems and rare British reptile fossils. A bone with bite marks can help illustrate the harsh and competitive environment of the Jurassic sea, where even large marine reptiles could become prey, carrion or the subject of scavenging after death.
Oxford Clay Marine Environment
The Oxford Clay Formation represents a rich marine environment filled with diverse Jurassic life. Ammonites and belemnites swam through the water column, fish and marine reptiles hunted in the sea, while bivalves, crustaceans and other invertebrates lived in or on the soft sea floor. The fine clay sediments helped preserve many fossils in remarkable detail, making the formation one of the most important sources of Jurassic marine reptile material in the UK.
Pliosaurs were among the apex predators of this environment. With powerful jaws, conical teeth and streamlined bodies, they were well adapted for hunting fish, cephalopods and other marine reptiles. This humerus bone, with its visible predation marks, captures part of that ancient ecological story.
Authenticity and Presentation
This fossil is a genuine specimen and includes a fully hand-signed Premium Certificate of Authenticity. Full sizing please see photo. The fossil is a carefully chosen piece, with the photo showing the actual specimen you will receive.
This rare pliosaur paddle humerus bone from the Oxford Clay Formation is ideal for serious fossil collectors, marine reptile enthusiasts, British Jurassic fossil specialists, educational collections and natural history displays. With its Peterborough provenance, Jurassic age, pliosaur anatomy and predation bite marks, it is a highly distinctive and scientifically interesting specimen from one of the UK’s most famous fossil formations.
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