Description
Authentic Promicroceras Ammonite from the Jurassic Coast
This superb Promicroceras calcite ammonite fossil originates from the famous Black Ven Marls of Lyme Regis on the UNESCO World Heritage Jurassic Coast, Dorset, UK. Dating to the Lower Jurassic (Sinemurian stage, approximately 199–190 million years ago), this specimen represents a classic example of early Jurassic marine life preserved within one of the most iconic fossil-bearing formations in the world.
Carefully discovered by our team members, Alister and Alison, this fossil has been expertly cleaned, prepared, and treated by Alison to enhance both its preservation and natural beauty. The photograph provided shows the exact specimen you will receive, ensuring complete transparency and confidence.
Species Overview – Promicroceras Ammonite
Promicroceras is a well-known genus of early Jurassic ammonites, belonging to the family Promicroceratidae within the superfamily Eoderoceratoidea and order Ammonitida. These ammonites are characterised by their tightly coiled, evolute shells, strong ribbing, and well-defined whorl sections.
The ribbing typically radiates across the shell with a consistent pattern, often bifurcating or branching as it progresses outward. This creates a visually striking texture, further enhanced in this specimen by the presence of calcite mineralisation. The preservation of the internal chambers, often infilled with crystalline calcite, adds both scientific interest and aesthetic appeal.
Promicroceras is commonly associated with the lower Sinemurian biozones and is considered an important index fossil for this interval, aiding in the precise dating of Jurassic sedimentary layers.
Calcite Preservation and Visual Appeal
One of the standout features of this fossil is the presence of calcite within the ammonite’s chambers. Over millions of years, mineral-rich waters permeated the shell, depositing crystalline calcite that now catches the light beautifully. This natural mineralisation enhances the fossil’s appearance, giving it a subtle sparkle and depth that makes it highly desirable for collectors.
The contrast between the darker marl matrix and the lighter calcite-filled ammonite creates an eye-catching display piece suitable for any collection or interior setting.
Geological Context – Black Ven Marls, Lower Lias
The Black Ven Marls form part of the Lower Lias Group and are renowned for their exceptional fossil content, particularly ammonites, marine reptiles, and other marine fauna. These sediments were deposited in a relatively deep, still marine environment where fine muds settled on the seabed, allowing delicate organisms to be preserved in remarkable detail.
The Lyme Regis area is historically significant in palaeontology, famously associated with early fossil collectors such as Mary Anning. Fossils from this region are highly sought after due to their quality, provenance, and scientific importance.
Display Quality and Presentation
This specimen has been carefully selected for its strong definition and visual impact. The ammonite’s ribbing and calcite infill are clearly visible, making it an excellent display piece. Whether placed in a cabinet, used in educational settings, or added to a growing fossil collection, this piece offers both aesthetic and scientific value.
Please refer to the images for exact size and condition, as these form an essential part of the description.
Provenance and Authenticity Guarantee
This fossil is 100% genuine and comes complete with a Certificate of Authenticity, providing a lifetime guarantee. It has been responsibly collected and professionally prepared by our experienced team, ensuring you receive a high-quality and authentic specimen.
A Classic Jurassic Ammonite from Lyme Regis
- Genuine Promicroceras ammonite fossil from Dorset, UK
- Lower Jurassic (Sinemurian) age from the Black Ven Marls
- Beautiful calcite crystal preservation within shell chambers
- Collected and prepared by experienced fossil specialists
- Exact specimen shown in photographs
This is a rare opportunity to own a genuine piece of early Jurassic history from one of the most famous fossil locations in the world, combining scientific importance with natural beauty.
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