Ichthyosaur Jaw Fossil Lyme Regis Dorset UK Jurassic Marine Reptile – Lower Lias Black Ven Marls Specimen with Hand Signed Certificate

Description

Ichthyosaur Jaw Fossil from the Jurassic Coast of Lyme Regis

This genuine Ichthyosaur jaw fossil originates from the famous Black Ven Marls of the Lower Lias Formation at Black Ven, Lyme Regis, Dorset, United Kingdom. Dating to the Early Jurassic Period approximately 200–190 million years ago, this specimen represents part of the jaw of one of the most iconic marine reptiles of the Mesozoic oceans.

The cliffs of Lyme Regis form part of the Jurassic Coast UNESCO World Heritage Site, internationally recognised for its extraordinary fossil record. The area has produced some of the most significant marine reptile discoveries in the history of palaeontology, including early finds that helped establish the scientific understanding of extinct marine reptiles.

The fossil shown in the photographs is the exact specimen you will receive, carefully selected for its preservation and scientific interest. The specimen includes a fully hand-signed Premium Certificate of Authenticity, confirming that the fossil is genuine.

Please refer to the photographs for full specimen sizing and scale.

About Ichthyosaurs – Predators of the Early Jurassic Seas

Ichthyosaurs were highly specialised marine reptiles that lived throughout much of the Mesozoic Era, particularly during the Triassic and Jurassic periods. Their streamlined body shape strongly resembled modern dolphins or tuna, although they were reptiles rather than mammals.

Taxonomic classification:

• Kingdom: Animalia
• Phylum: Chordata
• Class: Reptilia
• Order: Ichthyosauria

Ichthyosaurs were superbly adapted for life in the ocean. Their anatomical features included:

• Streamlined bodies for efficient swimming
• Large eyes adapted for underwater vision
• Strong tail fins providing propulsion
• Long, narrow jaws lined with conical teeth

These reptiles were fast-moving predators that hunted fish, squid-like cephalopods, and other marine organisms. Their jaws were equipped with numerous pointed teeth ideal for gripping slippery prey before swallowing it whole.

Many ichthyosaur fossils discovered along the Dorset coast belong to genera such as Ichthyosaurus, which were among the most common marine reptiles inhabiting the Early Jurassic seas.

Geological Context – Black Ven Marls of the Lower Lias

This fossil comes from the Black Ven Marls, part of the Lower Lias Group, a sequence of Early Jurassic marine sedimentary rocks exposed along the coastline between Lyme Regis and Charmouth.

These rocks were deposited during the Hettangian and Sinemurian stages of the Early Jurassic. At that time, southern Britain was submerged beneath a warm shallow epicontinental sea teeming with marine life.

The Black Ven Marls consist mainly of:

• Marls
• Shales
• Thin limestone beds

These fine-grained sediments accumulated slowly on the seafloor, allowing the remains of marine animals to become buried and fossilised. Periodic low oxygen conditions helped preserve skeletons before decomposition occurred.

Fossils commonly found within the Black Ven Marls include:

• Marine reptiles such as ichthyosaurs and plesiosaurs
• Ammonites and belemnites
• Fossil fish
• Bivalves and other marine invertebrates

These deposits represent one of the most important Early Jurassic fossil assemblages in Europe.

Structure and Morphology of the Ichthyosaur Jaw

The jaws of ichthyosaurs were specialised structures adapted for capturing fast-moving prey in open marine environments. Their elongated jaws contained numerous conical teeth arranged along the jawline.

Characteristic features of ichthyosaur jaw fossils include:

• Long, narrow mandibular or maxillary bones
• Tooth sockets or preserved conical teeth
• Dense bone adapted for powerful biting forces
• Smooth outer bone surfaces with occasional vascular grooves

The teeth were not designed for chewing but for gripping prey. Once captured, prey items were typically swallowed whole.

Ichthyosaurs occupied a role similar to modern marine predators such as dolphins and large fish, dominating the food chains of Early Jurassic marine ecosystems.

A Genuine Jurassic Marine Reptile Fossil with Premium Certificate

This specimen represents a genuine fossil marine reptile bone from one of the world’s most famous fossil localities.

Key features of this fossil include:

• Genuine Ichthyosaur jaw fossil
• Geological formation: Black Ven Marls, Lower Lias
• Age: Early Jurassic Period
• Locality: Black Ven, Lyme Regis, Dorset, United Kingdom
• Marine reptile fossil from the Jurassic Coast UNESCO World Heritage Site
• Classic marine predator skeletal fossil
• The exact specimen shown in the photographs
• Includes a fully hand-signed Premium Certificate of Authenticity

Ichthyosaurs were among the dominant predators of the Jurassic seas, and fossils from Lyme Regis have played a central role in the discovery and study of these remarkable animals. This specimen preserves part of the jaw of a marine reptile that lived nearly 200 million years ago, offering collectors a fascinating and authentic piece of prehistoric marine life from one of the most famous fossil sites in the world.