Description
Rare Hoplites dentatus Fossil Ammonite from Folkestone
This listing features a rare Hoplites dentatus fossil ammonite from the world-famous Gault Clay Formation at Folkestone, Kent, United Kingdom. Dating to the Aptian stage of the Early Cretaceous Period, approximately 125–113 million years ago, this specimen represents one of the most scientifically important ammonites of its age. Its distinctive morphology and rarity make it highly prized by collectors, educators, and palaeontologists alike.
Every fossil we sell is a 100% genuine specimen and is accompanied by a Certificate of Authenticity. The photographs show the exact ammonite you will receive, with a 1 cm scale cube and rule squares provided for size accuracy.
Geological Context and Age
The Gault Clay Formation is a marine deposit from the Aptian to Albian stages of the Early Cretaceous, well known for its exceptional preservation of ammonites and other marine fauna. These sediments were deposited in a warm, shallow sea that once covered much of southern England, linked to the vast Tethys Ocean.
Within the Aptian stage, Hoplites dentatus is an especially significant index fossil. Its presence in specific layers of the Gault Clay allows geologists to define and correlate the Dentatus Zone, a critical subdivision of the Aptian used in stratigraphy worldwide. This makes the species not only a collector’s treasure but also a key tool in geological dating.
Morphology and Distinctive Features
Hoplites dentatus belongs to the family Hoplitidae, within the order Ammonitida. Its shell is typically compressed and involute, with fine but sharp ribbing across the flanks. The ribs are often straight and may bifurcate (branch) as they cross the shell, giving it a refined and ornate appearance.
The venter (outer rim) is strongly keeled, a feature characteristic of the genus, aiding in streamlining and efficient movement through the water column. Its delicate yet distinct ribbing and keeled venter set it apart from other ammonites of the Gault Clay, making it instantly recognisable to experts and collectors.
Scientific Importance
As the defining ammonite of the Dentatus Zone, Hoplites dentatus holds immense value in biostratigraphy. Its rapid evolution and easily identifiable morphology make it a critical marker for establishing the age of Aptian sediments not just in Britain, but also across Europe and beyond.
The evolutionary significance of Hoplites dentatus also lies in its transitional features, linking earlier Aptian ammonites with later Albian descendants. Its morphology demonstrates how ammonites adapted to shifting marine environments during the Cretaceous.
Collector and Display Value
This rare Hoplites dentatus fossil ammonite from Folkestone is both scientifically valuable and visually appealing. Collectors appreciate its rarity, sharp ribbing, and excellent preservation, while researchers value its role as a key index fossil.
Fossils from the Gault Clay are renowned for their scientific and historical importance, and Hoplites dentatus is among the most sought-after species from this famous site. Whether for a private collection, museum display, or academic study, this specimen represents a significant addition.
Your Guarantee of Authenticity
- 100% genuine Hoplites dentatus ammonite fossil
- Geological age: Aptian stage, Early Cretaceous (approx. 125–113 million years ago)
- Formation: Gault Clay Formation, Folkestone, Kent, UK
- Family: Hoplitidae, Order: Ammonitida
- Distinctive features: compressed, keeled shell with fine ribbing
- Exact specimen shown in photographs (not a stock image)
- Supplied with a Certificate of Authenticity
- Scale cube and rule squares = 1 cm for accurate size reference
This rare Hoplites dentatus ammonite fossil offers a unique opportunity to own a scientifically significant specimen from one of Britain’s most iconic fossil localities.
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