3 x Promicroceras and Cymbites Calcite Ammonite Fossil Jurassic Coast Charmouth Dorset UK

Description

Specimen Overview

This outstanding fossil specimen features a natural association of three Promicroceras ammonites and one Cymbites ammonite, preserved together within the original matrix of the Black Ven Marls, Charmouth, near Lyme Regis, Dorset. Multi-ammonite groupings of this quality are particularly desirable, offering both strong visual impact and increased scientific interest. The pale calcite preservation contrasts beautifully against the darker marl, clearly defining each shell. The photographs show the exact fossil you will receive, with full sizing details available in the images. As with all of our fossils, this specimen is 100% genuine and supplied with a Certificate of Authenticity.

Geological Formation & Provenance

The fossil originates from Black Ven, one of the most famous and productive fossil localities on the Jurassic Coast, a UNESCO World Heritage Site of international importance. The Black Ven Marls form part of the Lower Lias Group, deposited during the Early Jurassic Period, approximately 199–190 million years ago. These fine-grained marine sediments accumulated in a relatively calm offshore environment, where low-energy conditions allowed shells to settle gently on the seabed and become rapidly buried. This environment is ideal for preserving ammonites in close proximity, resulting in natural multi-specimen associations such as this example.

Fossil Type & Taxonomic Context

Both Promicroceras and Cymbites are extinct marine cephalopods belonging to the Class Cephalopoda, Subclass Ammonoidea, within the Order Ammonitida. Ammonites were active, free-swimming predators related to modern squid and cuttlefish. Promicroceras is typically associated with early Lower Lias ammonite assemblages and is recognised for its compact coiling and stratigraphic importance. Cymbites is distinguished by its broader whorls and more robust shell form. Together, these genera provide an excellent snapshot of Early Jurassic ammonite diversity.

Morphology & Preservation

All four ammonites display clearly defined coiling and well-preserved whorl outlines. Calcite replacement has preserved the original shell geometry while enhancing surface detail, giving the shells a subtle crystalline appearance under light. Growth features and curvature are visible across the specimens, allowing appreciation of their development during life. The surrounding marl matrix remains intact, preserving the fossils in their original geological context and confirming this as a genuine natural grouping rather than a composite arrangement.

Scientific & Collecting Significance

Ammonites from Charmouth and Lyme Regis have been studied for over two centuries and played a central role in the development of early geological and stratigraphic science. Both Promicroceras and Cymbites are well-known and widely referenced genera within Early Jurassic ammonite successions. Fossils from Black Ven are internationally recognised for their reliable provenance and scientific credibility. A specimen containing multiple ammonites of more than one genus is particularly appealing to collectors, educators, and display collections due to its rarity and interpretive value.

Display, Care & Authenticity

This fossil is ideal for display in a private collection, educational setting, or natural history cabinet, offering both aesthetic presence and scientific interest. The specimen has been carefully cleaned to reveal natural features, with no artificial restoration or reconstruction applied. You will receive the exact fossil shown, accompanied by a Certificate of Authenticity, confirming its geological origin and genuine nature.

A striking and scientifically meaningful piece from one of Britain’s most iconic fossil cliffs, this grouping of three Promicroceras and one Cymbites ammonites represents an authentic and visually impressive example of Early Jurassic marine life from the Jurassic Coast.