Xipheroceras Calcite Ammonite Fossil Jurassic Coast Black Ven Charmouth Dorset UK

Description

Specimen Overview

This offering presents a genuine Xipheroceras calcite ammonite fossil collected from the renowned Black Ven Marls at Charmouth, near Lyme Regis, Dorset. The specimen has been carefully selected for its clear shell definition, natural balance within the matrix, and attractive contrast between the pale calcite-replaced ammonite and the darker marl. The photographs show the exact fossil you will receive, and full sizing details are provided in the images. As with all of our fossils, this piece is 100% genuine and is supplied with a Certificate of Authenticity.

Geological Formation & Provenance

The fossil originates from Black Ven, one of the most prolific and scientifically important fossil localities along the Jurassic Coast, a UNESCO World Heritage Site celebrated worldwide for its continuous exposure of Early Jurassic strata. 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 are composed of fine-grained marine mudstones laid down in a relatively calm offshore environment. These low-energy conditions allowed ammonite shells to settle on the seabed and be rapidly buried, resulting in the excellent preservation characteristic of fossils from this area.

Fossil Type & Taxonomic Context

Xipheroceras is an extinct genus of ammonite belonging to the Class Cephalopoda, Subclass Ammonoidea, and Order Ammonitida. Ammonites were free-swimming marine molluscs closely related to modern squid and cuttlefish and formed a dominant and diverse group within Jurassic seas. Xipheroceras is particularly well known within Lower Lias ammonite assemblages and is recognised for its importance in understanding early Jurassic ammonite evolution and stratigraphy.

Morphology & Preservation

This specimen displays the characteristic shell morphology of Xipheroceras, with clearly defined coiling and well-preserved whorl outlines. Calcite replacement has preserved the original shell geometry while enhancing surface detail, giving the fossil a subtle crystalline appearance when viewed under light. Growth features and shell curvature remain visible, offering insight into the ammonite’s development during life. The surrounding marl matrix remains intact, preserving the fossil in its original geological context rather than as a removed or isolated shell.

Scientific & Collecting Significance

Ammonites from Charmouth and Lyme Regis have been collected and studied for more than two centuries and played a key role in the early development of geology and stratigraphic science. Fossils from Black Ven are internationally recognised for their reliable provenance and scientific credibility. Xipheroceras is a desirable genus among collectors due to its distinctive appearance and its association with classic Lower Lias faunas. Specimens from this locality are valued not only for their aesthetic appeal but also for their educational and scientific importance.

Display, Care & Authenticity

This fossil is ideal for display in a private collection, educational setting, 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 ammonite from one of Britain’s most iconic fossil cliffs, this Xipheroceras calcite ammonite fossil represents an authentic piece of Early Jurassic marine history from the Jurassic Coast.