Promicroceras Ammonite Fossil Woodstone Calcite Cluster Lyme Regis Dorset UK Lower Lias Jurassic Coast Rare Multi Fossil Display Specimen

Description

Promicroceras Ammonite Fossil Woodstone – Multi Specimen Calcite Cluster from Lyme Regis

This exceptional fossil woodstone piece is densely packed with multiple Promicroceras ammonite fossils, preserved in beautiful calcite within the Black Ven Marls of the Lower Lias, Jurassic Coast at Black Ven, Lyme Regis, Dorset, UK. A highly decorative and scientifically significant specimen, this piece showcases a natural cluster of early Jurassic ammonites embedded within a single matrix. The exact specimen shown in the photographs is the one you will receive, carefully selected for its richness, clarity, and display quality.

Geological Age & Formation

This fossil originates from the Lower Jurassic period, specifically the Sinemurian stage, approximately 190–199 million years ago. The Black Ven Marls are world-renowned for their fossil-rich deposits, formed in a calm, shallow marine environment. Promicroceras is strongly associated with the Promicroceras planicosta Biozone, an important stratigraphic marker used to define horizons within the Lower Lias sequence.

Taxonomy & Classification

• Order: Ammonitida
• Superfamily: Psiloceratoidea
• Family: Arietitidae
• Genus: Promicroceras

Promicroceras was first described by Hyatt and is one of the most recognisable ammonites of the Lower Jurassic, known for its abundance and well-defined ribbed shells.

Morphology & Notable Features

This woodstone slab displays numerous Promicroceras specimens preserved together, creating a natural fossil assemblage. Each ammonite exhibits classic planispiral coiling with fine to moderately strong ribbing radiating across the shell. The ribbing often strengthens towards the outer whorls, giving the fossils a textured and highly detailed appearance.

The calcite preservation enhances the visual appeal, with crystalline surfaces catching the light and highlighting the intricate structure of each ammonite. The clustering of multiple individuals within one matrix reflects natural accumulation, possibly representing a mass mortality or depositional concentration event.

Depositional Environment

The Black Ven Marls were deposited in a relatively low-energy marine setting, allowing fine sediments to settle and preserve delicate shell structures. Periodic anoxic conditions on the seabed helped protect organic remains from scavenging, leading to exceptional fossil preservation. Ammonites like Promicroceras thrived in these Jurassic seas, forming an important part of the marine ecosystem.

Discovery & Professional Preparation

This remarkable specimen was discovered by our experienced team members, Alister and Alison, along the Jurassic Coast at Lyme Regis. Following careful extraction, the fossil was meticulously cleaned, prepared, and stabilised by Alison. The preparation process has been carried out to enhance the visibility of each ammonite while preserving the natural integrity of the matrix.

Authenticity & Provenance

This is a genuine fossil specimen and includes a fully hand-signed Premium Certificate of Authenticity. All of our fossils are responsibly sourced and professionally prepared, ensuring both scientific accuracy and collector confidence.

Display & Collectability

Multi-ammonite woodstone pieces such as this are highly sought after due to their visual impact and rarity. The combination of numerous Promicroceras fossils within a single slab creates a striking natural display, ideal for collectors, educators, or interior décor. Its origin from the Jurassic Coast, a UNESCO World Heritage Site, further enhances its desirability and provenance.

Condition & Sizing

Please refer to the photographs for full sizing and condition details, as they form part of the description. This is a carefully chosen specimen, and the images accurately represent the exact fossil you will receive.