2.5in Asteroceras Calcite Ammonite Fossil Jurassic Coast Dorset UK Lower Lias Black Ven Marls Charmouth COA Included

Description

Genuine 2.5″ Asteroceras Calcite Ammonite – Jurassic Coast Fossil from Dorset

Offered here is an impressive 2.5 inch Asteroceras calcite ammonite fossil, preserved within the famous Black Ven Marls of the Lower Lias Formation along the world-renowned Jurassic Coast of Dorset, England. This specimen comes from Stonebarrow Cliff, Charmouth, Lyme Regis, one of the most important ammonite fossil localities in Europe.

At 2.5 inches, this ammonite is a superb size for display, combining strong presence with excellent preservation detail. This is a carefully chosen piece, selected for its bold ribbing, attractive calcite mineralisation, and outstanding presentation. The photographs show the exact fossil you will receive, with full sizing clearly visible in the provided images.

Every fossil we offer is a genuine specimen, and this ammonite includes a Certificate of Authenticity with lifetime guarantee, supplied as a generic authenticity card for permanent documentation and complete buyer confidence.

Geological Setting – Black Ven Marls, Lower Lias

This fossil originates from the famous Black Ven Marls, part of the Lower Lias Group, dating to the Early Jurassic approximately 190–200 million years ago. During this period, Dorset was submerged beneath a warm, shallow marine sea rich in ammonites, belemnites, fish, and large marine reptiles such as ichthyosaurs and plesiosaurs.

The Black Ven Marls were deposited in a quiet offshore environment where fine sediments settled gently onto the seabed. Low oxygen conditions helped reduce scavenging and decay, allowing shells to fossilise with exceptional clarity.

Stonebarrow Cliff and the Charmouth coastline are internationally famous for producing some of the finest Lower Jurassic ammonites in the world, making fossils from this locality highly sought after.

Fossil Species – Asteroceras Ammonite

Asteroceras is a classic Lower Jurassic ammonite genus belonging to the extinct subclass Ammonoidea, within the class Cephalopoda. Ammonites were marine molluscs related to modern squid and cuttlefish and were among the most diverse and abundant predators of Jurassic seas.

Asteroceras is especially valued for its robust spiral shell, pronounced ribbing, and strong whorl form. These ammonites are not only beautiful collector fossils but also scientifically important, serving as key index fossils used to date and correlate Early Jurassic marine rock layers.

Specimens from Lyme Regis and Charmouth are particularly desirable due to the worldwide reputation of the Jurassic Coast for exceptional ammonite preservation.

Calcite Preservation and Display Features

This specimen displays beautiful calcite preservation, formed when mineral-rich fluids replaced or infilled the original shell structure during fossilisation. Calcite ammonites often show enhanced contrast and crystalline highlights, making them especially attractive for collectors.

The ammonite retains its natural spiral geometry and ribbed ornamentation, and the calcite mineralisation gives the fossil a distinctive bright and refined appearance compared with standard limestone ammonites.

At 2.5 inches, this fossil is an ideal centrepiece for display cabinets, desks, or educational collections, offering a perfect balance of size, detail, and visual appeal.

Authenticity and Collector Confidence

This is a 100% genuine Asteroceras calcite ammonite fossil, responsibly sourced from Stonebarrow Cliff on the Dorset Jurassic Coast.

It includes a lifetime Certificate of Authenticity, ensuring complete confidence in provenance and genuineness.

Ideal For Collectors, Gifts and Educational Displays

This fossil is perfect for:

• Ammonite and Jurassic fossil collectors
• Charmouth and Lyme Regis Jurassic Coast enthusiasts
• Calcite mineral and fossil lovers
• Natural history and geology displays
• Unique prehistoric gifts from England

A wonderful opportunity to own an authentic 2.5″ Asteroceras calcite ammonite from the legendary Black Ven Marls of Charmouth, preserved from an ancient sea nearly 200 million years ago and accompanied by a lifetime Certificate of Authenticity.