Description
Exceptional 5.5″ Harpoceras Fossil Ammonite from Somerset
This impressive 5.5″ Harpoceras Somerset Fossil Ammonite comes from the well-known Beacon Limestone Formation, a classic Jurassic deposit near Ilminster, Somerset, UK. Harpoceras ammonites are prized for their distinctive ribbing, elegant compressed whorls, and aesthetically striking shell form. This specimen is a premium-quality, hand-selected example showcasing the characteristic morphology that makes Harpoceras one of the most desirable ammonite genera for collectors.
Your fossil was discovered on 01 September 2025 by our highly experienced field team, Alister and Alison, who specialise in responsible collection across key UK fossil localities. It has been professionally cleaned, prepped, and treated by Alison to reveal the intricate patterning, rib structure, and natural beauty of the shell. The images provided show the exact specimen you will receive, chosen for its completeness, preservation, and display appeal. Full measurements can be viewed in the listing photographs.
Geological Setting: Beacon Limestone, Jurassic Period
The Beacon Limestone Formation is an important Middle Jurassic deposit, renowned for its exceptional preservation of ammonites and other marine fossils. Formed in a shallow, warm, carbonate-rich sea, the sediments of this formation capture a thriving marine ecosystem that existed approximately 170 million years ago.
Within this geological context, Harpoceras represents a significant ammonite genus in the order Ammonitida and family Harpoceratidae. These ammonites are well known for their compressed shells, sharp ribbing, and the distinctive keel that runs along the venter. The Beacon Limestone is one of the finest sources for Harpoceras in the UK, producing specimens with clear structural definition and excellent mineral stability.
Morphology and Distinctive Features of Harpoceras
This 5.5″ specimen exhibits all the defining traits expected of the genus, including:
- Strong, clean, radial ribbing across each whorl
- A compressed, discoidal shell profile with narrow whorls
- A smooth, well-defined keel along the outer rim
- Clear suture lines revealed through expert preparation
- Excellent preservation of lateral ornamentation
- A robust and display-ready natural limestone matrix
The clarity and sharpness of the ribbing make this ammonite especially desirable, reflecting both the natural preservation quality of the Beacon Limestone and the professional preparation work carried out by Alison.
Authenticity, Provenance, and Ethical Collection
We guarantee that all fossils we sell are 100% genuine specimens, never moulds, reproductions, or composites. Each fossil includes a Certificate of Authenticity, confirming its origin and geological identity. Because this specimen was discovered and prepared directly by members of our own team, its provenance is fully documented from field to finish.
The ammonite shown in the photos is the exact piece you will receive, ensuring complete confidence in quality, appearance, and authenticity.
A Premium Collector’s Fossil from a Classic UK Locality
This 5.5″ Harpoceras Fossil Ammonite from Ilminster, Somerset represents a top-grade specimen from one of Britain’s most respected Jurassic ammonite localities. With its striking ribbing, excellent preservation, and impressive size, it is ideally suited for collectors, educational use, display settings, or anyone seeking a rare and scientifically meaningful ammonite for their collection.
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