Hybodus Shark Tooth Fossil Block Aust Cliff Bristol Westbury Formation Upper Triassic UK

Description

Rare Hybodus Shark Tooth Fossil from Aust Cliff

This exceptional fossil features a well-preserved Hybodus shark tooth set in its original block matrix, collected from the famous fish, reptile, and coprolite bed at Aust Cliff, near Bristol, UK. The specimen comes from the Upper Triassic Westbury Formation of the Penarth Group and represents a fascinating glimpse into one of the most important pre-Jurassic marine ecosystems ever discovered. The photographs show the exact fossil you will receive, with a 1 cm scale cube provided for accurate size reference.

Geological Age and Origin

This fossil dates to the Upper Triassic period, approximately 208–201 million years ago. It originates from the Westbury Formation, part of the Penarth Group, which is internationally renowned for preserving a rich assemblage of vertebrate remains including fish, marine reptiles, and abundant coprolites. Aust Cliff is one of the most iconic British fossil localities, and its exposures provide a unique window into life during the closing stages of the Triassic, just before the Triassic–Jurassic mass extinction.

The Hybodus Shark

Hybodus was a genus of prehistoric sharks that lived from the Triassic through to the end of the Cretaceous. Characterised by their distinctive dorsal fin spines and heterodont dentition (different types of teeth within the same mouth), these sharks were versatile predators in ancient seas. The preserved tooth in this specimen demonstrates the strong, ridged enamel surface typical of Hybodus, which allowed it to feed on a wide range of prey, from soft-bodied animals to hard-shelled invertebrates. Fossilised teeth are among the most scientifically useful remains of sharks, as they provide direct evidence of diet, behaviour, and evolutionary adaptations.

Depositional Environment

The block in which this tooth is preserved formed in a shallow marine lagoonal environment, where fine sediment accumulated and vertebrate remains became concentrated. Periodic low-oxygen conditions on the seabed prevented decay and scavenging, enabling exceptional preservation of both hard and soft tissues. The famous fossil bed at Aust Cliff records a mixed ecosystem of fish, sharks, reptiles, and their coprolites, offering a comprehensive record of Late Triassic marine biodiversity. Fossils from this site are scientifically significant as they document life immediately prior to one of the Earth’s most dramatic extinction events.

Discovery and Preparation

This specimen was discovered on the 7th of April 2025 by our dedicated team members, Alister and Alison, during a field expedition to Aust Cliff. Following recovery, the fossil block was carefully cleaned, stabilised, and prepared by Alison. The preparation highlights the tooth clearly within the block while preserving the natural context of the surrounding sediment. This ensures that the specimen remains both scientifically valuable and visually striking.

Collectability and Authenticity

All of our fossils are guaranteed 100% genuine specimens and are accompanied by a Certificate of Authenticity. A Hybodus shark tooth from Aust Cliff is a rare and desirable addition to any fossil collection, combining excellent preservation with historical and geological significance. Specimens from the Westbury Formation are increasingly sought after due to their scientific importance and the limited accessibility of the locality. Whether for display, education, or research, this fossil offers a direct connection to the marine ecosystems of the Upper Triassic.

A Unique Opportunity

Owning this fossil means holding a tangible piece of natural history from a time when ancient sharks roamed the seas alongside marine reptiles and early fish. Its excellent preservation and provenance make it an outstanding specimen for collectors, educators, and enthusiasts of palaeontology alike. This is not a reproduction or cast—the tooth and its block are completely authentic, chosen for their quality and historical significance.