Echioceras Ammonite Fossil Polished Lyme Regis Jurassic UK Lower Lias Black Ven Marls Natural Marine Fossil Authentic Specimen

Description

Polished Echioceras Ammonite Fossil – Jurassic Coast, Lyme Regis, Dorset

This beautifully polished Echioceras ammonite fossil is a genuine specimen from the renowned Black Ven Marls of Charmouth, Lyme Regis, part of the UNESCO World Heritage Jurassic Coast in Dorset, UK. Dating to the Lower Lias of the Early Jurassic period, approximately 199–190 million years ago, this fossil combines scientific significance with enhanced visual appeal through careful polishing.

Selected for its quality and clarity, the polishing process reveals the intricate internal and external structure of the ammonite, highlighting its natural form and subtle mineralisation. The exact specimen shown in the photographs is the one you will receive, and it includes a Certificate of Authenticity lifetime guarantee generic card.

Geological Context – Black Ven Marls, Lower Lias Formation

The Black Ven Marls are part of the Lower Jurassic Lias Group, a sequence of clay-rich sediments deposited in a shallow marine environment covering southern Britain during the Early Jurassic. These marls are globally recognised for their exceptional fossil preservation, particularly ammonites and marine reptiles.

This specimen originates from deposits associated with the Sinemurian stage, a key interval of ammonite diversification. Fine-grained sedimentation, combined with low-energy seabed conditions, allowed delicate shells to be buried quickly and preserved in remarkable detail. Occasional anoxic conditions further reduced decay and disturbance.

Fossil Identification – Echioceras (Order: Ammonitida)

Echioceras is an Early Jurassic ammonite belonging to the order Ammonitida, a group of extinct marine cephalopods closely related to modern squid and octopus. This genus is typically placed within the family Echioceratidae and the superfamily Echioceratoidea.

Echioceras is widely recognised as an important index fossil within Lower Lias stratigraphy, commonly associated with specific ammonite biozones used to subdivide and date Early Jurassic sediments.

Morphology and Notable Features

This polished specimen clearly displays the defining characteristics of Echioceras:

• Moderately evolute coiling with well-defined whorls
• Fine, regular ribbing across the shell surface
• Smooth transitions between ribbed sections and whorl structure
• Polished surface revealing enhanced shell detail and internal features
• Natural fossil preserved within original Jurassic matrix

The polishing process enhances visibility of the ammonite’s structure without altering its natural form, making it ideal for both display and study.

Depositional Environment and Fossil Formation

During the Early Jurassic, the Lyme Regis region lay beneath a warm, shallow sea rich in marine life. Ammonites such as Echioceras were abundant and played a vital role in the marine ecosystem as both predators and prey.

After death, the shell would sink to the seabed and become buried by fine sediment. Rapid burial and stable conditions preserved the shell, while mineralisation gradually replaced the original material, forming a fossil.

Over millions of years, compaction of the surrounding sediment and subtle mineral changes preserved the ammonite in fine detail. The later polishing process reveals these details, offering a clearer view of the fossil’s morphology.

Scientific and Collecting Significance

Echioceras is a key genus within Early Jurassic ammonite assemblages and is valued for its role in biostratigraphy. Fossils from the Jurassic Coast are especially significant due to their well-documented geological context and historical importance.

Lyme Regis is one of the most famous fossil locations in the world, with discoveries from this area contributing significantly to the development of palaeontology. Polished ammonites from this region are highly sought after, combining scientific value with aesthetic appeal.

Authenticity and Presentation

This fossil is a 100% genuine Echioceras ammonite and includes a Certificate of Authenticity lifetime guarantee generic card. The fossil shown in the photographs is the exact specimen you will receive.

Full sizing can be confirmed via the listing images, ensuring complete confidence in your purchase.

Ideal for Collectors, Display, or Educational Use

This polished Echioceras ammonite is an excellent addition to any fossil collection, offering a balance of natural beauty and geological significance. Perfect for collectors, educators, or as a unique gift, it represents a genuine piece of Jurassic marine history from one of the world’s most celebrated fossil localities.