Coeloceras Golden Pyrite Ammonite Fossil Jurassic Dorset UK Black Ven Marls Lower Lias Stonebarrow Cliff Charmouth Lyme Regis

Description

Genuine Golden Pyrite Coeloceras Ammonite from the Jurassic Coast

Offered here is a beautifully preserved Coeloceras golden pyrite ammonite fossil, collected from the renowned Black Ven Marls at Stonebarrow Cliff, Charmouth, part of the world-famous Jurassic Coast at Lyme Regis, Dorset, UK. This is a carefully chosen natural specimen, and the photographs show the exact fossil you will receive, with full sizing and scale clearly visible in the images provided.

This fossil includes a lifetime Certificate of Authenticity on a generic card, confirming it as a genuine natural specimen. The ammonite has been professionally cleaned, prepared, and stabilised to enhance detail while preserving its original geological integrity.

Fossil Type and Species – Coeloceras

Coeloceras is a distinctive ammonite genus from the Lower Jurassic (Lower Lias), belonging to the Order Ammonitida, within the Family Eoderoceratidae. These ammonites lived during the Sinemurian Stage, approximately 195 million years ago, when warm, shallow seas covered much of southern Britain.

Coeloceras is valued for its striking shell ornamentation and its role within Early Jurassic ammonite successions. Specimens from Dorset are especially prized due to their strong preservation and their importance within British Jurassic stratigraphy.

Morphology and Diagnostic Characteristics

This specimen displays the defining features of Coeloceras, including:

• A moderately evolute, planispiral shell with visible whorls
• Strong, bold radial ribbing extending across the flanks
• A robust whorl profile with clear symmetry
• Distinct growth lines reflecting natural shell development

The pronounced ribbing gives Coeloceras an impressive and textured appearance, making it highly attractive for fossil collectors and educational displays.

Golden Pyrite Preservation

One of the most remarkable features of this fossil is its natural golden pyrite mineralisation. Pyrite, often referred to as “fool’s gold,” formed when iron and sulphur combined under low-oxygen conditions within the fine marine sediments of the Jurassic seabed. Over millions of years, pyrite replaced or infilled the original shell material, preserving delicate surface detail while producing a shimmering metallic gold finish.

Golden pyrite ammonites from the Black Ven Marls are especially sought after because they combine strong scientific value with exceptional aesthetic appeal. The reflective surface enhances the ribbing and shell contours, making this specimen particularly eye-catching under display lighting.

Geological Context – Black Ven Marls, Lower Lias

The Black Ven Marls were deposited in a quiet offshore marine environment during the Early Jurassic. Fine-grained muds accumulated on the sea floor, allowing ammonites and other marine organisms to be rapidly buried and fossilised under conditions favourable for mineral replacement.

Stonebarrow Cliff and Charmouth form part of the UNESCO World Heritage-listed Jurassic Coast, one of the most important fossil regions in the world. Fossils from this locality have been collected and studied for over two centuries and remain central to understanding Jurassic marine ecosystems, sedimentology, and ammonite evolution.

Collector, Educational, and Display Value

Coeloceras ammonites are highly desirable for:

• Fossil and ammonite collectors
• Mineral collectors attracted to pyrite preservation
• Educational and teaching collections
• Display cabinets and curated fossil shelves

The combination of bold shell ornamentation and golden pyrite mineralisation makes this specimen both visually impressive and scientifically meaningful.

Authenticity and Provenance

• Fossil type: Coeloceras ammonite
• Preservation: natural golden pyrite
• Formation: Black Ven Marls, Lower Lias
• Geological age: Lower Jurassic, Sinemurian Stage
• Locality: Stonebarrow Cliff, Charmouth, Lyme Regis, Dorset, UK
• Certificate: Lifetime Certificate of Authenticity included

This fossil represents a genuine piece of Dorset’s Jurassic seabed, preserving a marine animal that lived nearly 200 million years ago, and offers a rare opportunity to own a beautifully preserved golden pyrite ammonite from one of the world’s most celebrated fossil localities.