Rare Greensand Shark Tooth Fossil Selachii Cambridge Greensand Albian UK Specimen – West Melbury Marly Chalk Formation Cambridgeshire

Description

Rare Greensand Shark Tooth Fossil from the Cambridge Greensand

This genuine Greensand shark tooth fossil belonging to Selachii originates from the famous Cambridge Greensand Member of the West Melbury Marly Chalk Formation in Cambridgeshire, United Kingdom. These fossils date to the Lower Cretaceous Period, Albian Stage, approximately 113–100.5 million years ago, a time when much of what is now Britain was submerged beneath warm tropical seas.

The Cambridge Greensand deposits are particularly well known among collectors and paleontologists for their rich concentration of marine vertebrate fossils, including shark teeth, fish remains, reptile bones, and phosphatic nodules. Shark teeth from this deposit are especially sought after due to their excellent preservation and association with one of the most famous marine fossil beds in the United Kingdom.

This specimen is a carefully selected example preserved within the characteristic phosphatised Greensand matrix, representing a fascinating relic from an ancient marine ecosystem.

Geological Formation and Stratigraphic Context

The fossil originates from the Cambridge Greensand Member, which forms the basal bed of the West Melbury Marly Chalk Formation. This deposit marks the transition between the older Gault Clay sediments and the overlying Chalk Group.

The Cambridge Greensand represents a condensed lag deposit, formed when older sediments were eroded during a marine transgression and redeposited as a concentration of durable fossil material. Many fossils within this unit were originally deposited during earlier phases of the Albian and were subsequently reworked into the Greensand horizon.

The deposit is composed of glauconitic sands and phosphatic nodules, giving it its characteristic greenish appearance. These sediments accumulated in a shallow marine shelf environment along the northern margins of the ancient Tethys Ocean.

Fossil Type and Classification

The fossil belongs to Selachii, the taxonomic grouping that includes true sharks. Sharks belong to the class Chondrichthyes, a group of cartilaginous fishes whose skeletons are composed primarily of cartilage rather than bone. Because cartilage rarely fossilises, shark teeth are the most commonly preserved remains and provide important information about ancient shark diversity and ecology.

During the Cretaceous, the seas surrounding Britain hosted a wide range of shark species occupying different ecological niches. Their teeth display diverse morphologies adapted for feeding on fish, crustaceans, molluscs, and other marine organisms.

Shark teeth from the Cambridge Greensand are often distinguished by their robust enamel crowns, well-defined cutting edges, and phosphatic preservation, which gives them a dark glossy appearance.

Morphology and Notable Features

Shark teeth are highly specialised structures designed for continuous replacement throughout the animal’s life. Individual teeth were frequently shed and replaced, which is why they are common fossils in marine deposits.

Typical morphological features visible in Greensand shark teeth may include:

• A sharply defined enamel crown
• Distinct root structure used to anchor the tooth within the jaw cartilage
• Cutting edges adapted for slicing prey
• Surface texture reflecting enamel preservation

These teeth provide valuable clues about feeding behaviour, predatory strategies, and evolutionary relationships among ancient sharks.

Depositional Environment of the Cretaceous Seas

During the Albian Stage of the Early Cretaceous, southern Britain lay beneath a warm, shallow epicontinental sea rich in marine life. Coral communities, molluscs, fish, marine reptiles, and numerous shark species inhabited these waters.

Periodic changes in sea level and sediment supply resulted in the formation of the Greensand lag deposits, concentrating durable fossils such as shark teeth into dense fossil beds. This unique preservation process explains why the Cambridge Greensand is one of the most productive fossil shark tooth localities in Europe.

Authentic Fossil Specimen

This fossil is a genuine Greensand shark tooth from Cambridgeshire. The specimen has been carefully chosen for quality and display appeal, preserving the distinctive structure of the tooth within its natural matrix.

The photographs show the actual fossil specimen you will receive, ensuring complete authenticity and transparency for collectors.

Full sizing please see photo.

Certificate of Authenticity

This fossil includes a Certificate of Authenticity lifetime guarantee generic card, confirming that the specimen is a genuine natural fossil.

Shark teeth from the Cambridge Greensand are highly collectible due to their geological importance, classic British fossil locality, and strong connection to the ancient marine ecosystems of the Early Cretaceous seas. This specimen represents a striking and historically significant piece of Britain’s prehistoric marine life.