Double Promicroceras Calcite Ammonite Fossil Jurassic Coast Black Ven Charmouth Dorset UK

Description

Specimen Overview

Offered here is a genuine Double Promicroceras calcite ammonite fossil, preserved naturally together within the original matrix from the Black Ven Marls, Charmouth, near Lyme Regis, Dorset. This specimen shows two Promicroceras ammonites in close association, creating a visually balanced and scientifically interesting piece that is more uncommon than a single ammonite example. The pale calcite shells contrast beautifully against the darker marl, clearly defining the coiled forms. The photographs show the exact fossil you will receive, and full sizing details can be seen in the images. As with all of our fossils, this specimen is 100% genuine and comes with a Certificate of Authenticity.

Geological Formation & Locality

This fossil originates from Black Ven, one of the most famous fossil-producing cliffs along the Jurassic Coast, a UNESCO World Heritage Site recognised for its global geological importance. The fossil-bearing layers belong to the Lower Lias Group, deposited during the Early Jurassic Period, approximately 199–196 million years ago. The Black Ven Marls consist of fine-grained marine mudstones laid down in a relatively calm offshore environment. These low-energy seabed conditions allowed ammonite shells to settle gently and become rapidly buried, resulting in the excellent preservation typical of fossils from this locality.

Fossil Type & Taxonomic Context

Promicroceras is an extinct genus of ammonite within the Class Cephalopoda, Subclass Ammonoidea, and Order Ammonitida. Ammonites were active, free-swimming marine predators closely related to modern squid and cuttlefish. Promicroceras is especially characteristic of the earliest Jurassic ammonite faunas and is widely recognised as an important index fossil within the Lower Lias, making specimens of this genus both scientifically significant and highly collectible.

Morphology & Preservation

Both ammonites in this specimen display the characteristic tightly coiled shell morphology of Promicroceras, with clearly defined whorls and visible growth features that record the animals’ development during life. Calcite replacement has preserved the original shell geometry while enhancing surface detail, giving the fossils a subtle crystalline appearance when viewed under light. The surrounding marl matrix remains intact, preserving the ammonites in their original geological context and confirming this as a genuine natural double specimen rather than a composite arrangement.

Scientific & Collecting Significance

Ammonites from Charmouth and Lyme Regis have been collected and studied for over two centuries and played a central role in the early development of geological and stratigraphic science. Promicroceras is particularly important for understanding Early Jurassic ammonite successions and post-Triassic marine recovery. Fossils from Black Ven are internationally recognised for their reliable provenance and scientific credibility. A double Promicroceras specimen offers enhanced educational value, display appeal, and rarity compared to single examples.

Display, Care & Authenticity

This fossil is ideal for display in a private collection, educational environment, or natural history cabinet. The specimen has been carefully cleaned to reveal its natural features, with no artificial restoration or reconstruction applied. It remains exactly as preserved by nature. You will receive the exact specimen shown, accompanied by a Certificate of Authenticity, confirming its geological origin and genuine status.

A classic and scientifically meaningful fossil from one of Britain’s most iconic fossil localities, this Double Promicroceras calcite ammonite represents an authentic and visually striking piece of Early Jurassic marine life from the Jurassic Coast.