Promicroceras Golden Pyrite Ammonite Cluster Jurassic Dorset UK Black Ven Marls Lower Lias Stonebarrow Cliff Charmouth Lyme Regis
£ 48.00
GENUINE GOLDEN PYRITE PROMICROCERAS AMMONITE CLUSTER FROM THE JURASSIC COASTOffered here is a striking Promicroceras golden pyrite ammonite fossil cluster,
collected from the renowned Black Ven Marls at Stonebarrow Cliff, Charmouth, on the world-famous Jurassic Coast at Lyme Regis, Dorset, UK. This is a carefully chosen natural cluster, preserved in situ, with multiple ammonites grouped together as they were fossilised on the Jurassic sea floor. The photographs show the exact specimen you will receive, and full sizing can be seen clearly in the images.This fossil is supplied with a lifetime Certificate of Authenticity on a generic card, guaranteeing it as a genuine natural specimen. The piece has been professionally cleaned, prepared, and stabilised to enhance detail while preserving its natural integrity. FOSSIL TYPE AND SPECIES – PROMICROCERASPromicroceras is a classic ammonite genus from the Lower Jurassic (Lower Lias), belonging to the Order Ammonitida, Superfamily Psiloceratoidea, and Family Eoderoceratidae. These ammonites lived during the Sinemurian Stage, around 195 million years ago, when shallow epicontinental seas covered much of southern Britain.Promicroceras is particularly important in Early Jurassic biostratigraphy and is frequently used as an index fossil due to its well-defined morphology and restricted stratigraphic range. Clusters such as this provide valuable insight into ammonite behaviour and depositional processes. MORPHOLOGY AND CLUSTER FORMATIONEach ammonite within the cluster displays the defining characteristics of Promicroceras, including:
• Tight, planispiral coiling
• Strong, evenly spaced radial ribbing
• Compact shell proportions with clear symmetry
• Distinct growth lines reflecting natural shell developmentFossil clusters form when multiple individuals are rapidly buried together, often due to storm events or sudden sediment influx. This makes clusters rarer and more informative than single specimens, as they preserve a snapshot of the ancient marine environment. GOLDEN PYRITE PRESERVATIONOne of the most visually impressive features of this specimen is its natural golden pyrite mineralisation. Pyrite formed when iron and sulphur combined under low-oxygen conditions within the fine Jurassic muds of the Black Ven Marls. Over millions of years, pyrite replaced or infilled the original shell material, preserving fine anatomical detail while creating a metallic gold appearance.Golden pyrite ammonite clusters from Dorset are especially sought after because they combine exceptional scientific value with outstanding aesthetic appeal. The reflective surfaces highlight ribbing and shell contours, making this cluster a true centrepiece fossil. GEOLOGICAL CONTEXT – BLACK VEN MARLS, LOWER LIASThe Black Ven Marls were deposited in a quiet offshore marine environment during the Early Jurassic. Fine-grained sediments accumulated on the sea floor, allowing ammonites and other marine organisms to be rapidly buried and protected from disturbance.Stonebarrow Cliff and Charmouth lie within the UNESCO World Heritage-listed Jurassic Coast, one of the most important fossil regions in the world. Fossils from this locality have been studied for centuries and continue to play a key role in understanding Jurassic marine ecosystems, sedimentology, and ammonite evolution. COLLECTOR, EDUCATIONAL, AND DISPLAY VALUEPromicroceras ammonite clusters are highly desirable for:
• Fossil and ammonite collectors
• Mineral collectors drawn to pyrite preservation
• Educational and teaching collections
• Museum-style or cabinet displaysClusters are especially valued because they are visually dramatic and scientifically informative, offering more context than isolated specimens. AUTHENTICITY AND PROVENANCE
• Fossil type: Promicroceras ammonite cluster
• 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 includedThis exceptional ammonite cluster represents a genuine piece of Dorset’s Jurassic seabed, preserving a moment from an ancient marine ecosystem nearly 200 million years old, and offers a rare opportunity to own a museum-quality golden pyrite fossil from one of the world’s most celebrated fossil localities.
collected from the renowned Black Ven Marls at Stonebarrow Cliff, Charmouth, on the world-famous Jurassic Coast at Lyme Regis, Dorset, UK. This is a carefully chosen natural cluster, preserved in situ, with multiple ammonites grouped together as they were fossilised on the Jurassic sea floor. The photographs show the exact specimen you will receive, and full sizing can be seen clearly in the images.This fossil is supplied with a lifetime Certificate of Authenticity on a generic card, guaranteeing it as a genuine natural specimen. The piece has been professionally cleaned, prepared, and stabilised to enhance detail while preserving its natural integrity. FOSSIL TYPE AND SPECIES – PROMICROCERASPromicroceras is a classic ammonite genus from the Lower Jurassic (Lower Lias), belonging to the Order Ammonitida, Superfamily Psiloceratoidea, and Family Eoderoceratidae. These ammonites lived during the Sinemurian Stage, around 195 million years ago, when shallow epicontinental seas covered much of southern Britain.Promicroceras is particularly important in Early Jurassic biostratigraphy and is frequently used as an index fossil due to its well-defined morphology and restricted stratigraphic range. Clusters such as this provide valuable insight into ammonite behaviour and depositional processes. MORPHOLOGY AND CLUSTER FORMATIONEach ammonite within the cluster displays the defining characteristics of Promicroceras, including:
• Tight, planispiral coiling
• Strong, evenly spaced radial ribbing
• Compact shell proportions with clear symmetry
• Distinct growth lines reflecting natural shell developmentFossil clusters form when multiple individuals are rapidly buried together, often due to storm events or sudden sediment influx. This makes clusters rarer and more informative than single specimens, as they preserve a snapshot of the ancient marine environment. GOLDEN PYRITE PRESERVATIONOne of the most visually impressive features of this specimen is its natural golden pyrite mineralisation. Pyrite formed when iron and sulphur combined under low-oxygen conditions within the fine Jurassic muds of the Black Ven Marls. Over millions of years, pyrite replaced or infilled the original shell material, preserving fine anatomical detail while creating a metallic gold appearance.Golden pyrite ammonite clusters from Dorset are especially sought after because they combine exceptional scientific value with outstanding aesthetic appeal. The reflective surfaces highlight ribbing and shell contours, making this cluster a true centrepiece fossil. GEOLOGICAL CONTEXT – BLACK VEN MARLS, LOWER LIASThe Black Ven Marls were deposited in a quiet offshore marine environment during the Early Jurassic. Fine-grained sediments accumulated on the sea floor, allowing ammonites and other marine organisms to be rapidly buried and protected from disturbance.Stonebarrow Cliff and Charmouth lie within the UNESCO World Heritage-listed Jurassic Coast, one of the most important fossil regions in the world. Fossils from this locality have been studied for centuries and continue to play a key role in understanding Jurassic marine ecosystems, sedimentology, and ammonite evolution. COLLECTOR, EDUCATIONAL, AND DISPLAY VALUEPromicroceras ammonite clusters are highly desirable for:
• Fossil and ammonite collectors
• Mineral collectors drawn to pyrite preservation
• Educational and teaching collections
• Museum-style or cabinet displaysClusters are especially valued because they are visually dramatic and scientifically informative, offering more context than isolated specimens. AUTHENTICITY AND PROVENANCE
• Fossil type: Promicroceras ammonite cluster
• 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 includedThis exceptional ammonite cluster represents a genuine piece of Dorset’s Jurassic seabed, preserving a moment from an ancient marine ecosystem nearly 200 million years old, and offers a rare opportunity to own a museum-quality golden pyrite fossil from one of the world’s most celebrated fossil localities.
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