Asteroceras Calcite Ammonite Fossil Black Ven Lyme Regis Jurassic Coast UK Genuine Specimen with Certificate of Authenticity

Description

A Premium Asteroceras Calcite Ammonite from the Jurassic Coast

This exceptional Asteroceras Calcite Ammonite Fossil originates from the renowned Black Ven Marls, Lower Lias, along the world-famous Jurassic Coast at Black Ven, Lyme Regis, Dorset, UK. This coast is internationally celebrated for yielding some of the most iconic Early Jurassic fossils, and this specimen stands out as a superb, naturally preserved example. The ammonite displays beautiful calcite mineralisation and the classic tightly coiled form typical of the genus Asteroceras, making it an outstanding addition for collectors, educators, and enthusiasts alike.

The photos in the listing show the exact specimen you will receive, selected individually for its quality, display appeal, and authenticity.

Geological Context: Lower Lias of the Early Jurassic

The Black Ven Marls belong to the Lower Lias, a sequence deposited during the Early Jurassic period roughly 200–190 million years ago. These soft, grey-brown marine sediments accumulated in a relatively calm, shallow sea teeming with life. Among the most abundant and scientifically important fossils are ammonites, which serve as essential index fossils for dating Early Jurassic strata.

Asteroceras belongs to the family Asteroceratidae within the order Ammonitida, a lineage characterised by strong ribbing, elegant whorls, and distinctive shell geometry. Specimens from Black Ven often show superb mineralisation due to long-term diagenesis, where original shell material is replaced by stunning natural calcite. This process enhances both the beauty and durability of the specimen, giving it the glossy, crystalline finish prized by collectors.

Morphology and Notable Features

This ammonite exhibits the classic features of Asteroceras, including:

• Strong, well-defined ribs radiating across the whorls
• A robust, tightly coiled shell with excellent symmetry
• Natural calcite crystallisation accentuating the internal chamber pattern
• Fine suture lines visible in prepared areas
• Excellent lateral display profile suitable for framing, shelving, or educational presentation

The preservation quality highlights the distinctive architecture of Early Jurassic ammonites, offering a visually striking specimen that also holds scientific interest.

Collection-Grade Authentic Fossil

The fossil shown in the photographs is the exact piece you will receive, ensuring complete transparency in quality and appearance. For full sizing details, please refer to the product images.

A Meaningful Addition for Collectors and Enthusiasts

Whether you are expanding an existing collection, searching for an impressive display fossil, or selecting a scientifically meaningful piece from the Jurassic Coast, this Asteroceras Calcite Ammonite from Black Ven represents a rare opportunity to own a beautifully preserved ammonite from one of the most iconic fossil localities on Earth. Each specimen from this site is unique, and this carefully chosen example exemplifies the best qualities these ammonites can offer.