Ichthyosaur Vertebra Fossil Reptile Bone Jurassic Coast Lower Lias Black Ven Lyme Regis

Description

Ichthyosaur Vertebra Fossil from the Jurassic Coast

This genuine Ichthyosaur Vertebra Fossil was discovered at the historically significant Jurassic Coast locality of Black Ven, Lyme Regis, Dorset, UK, one of the world’s richest Early Jurassic marine fossil sites. Unearthed by our team members Alister and Alison on 11 November 2025, the specimen has been professionally cleaned, prepared, and stabilised by Alison to ensure structural integrity and excellent display quality. The photographs show the actual vertebra you will receive, with a 1cm scale cube included for accurate sizing. Every fossil we supply is a 100% genuine specimen and comes with a Certificate of Authenticity.

Species Overview: Ichthyosauria – Marine Reptiles of the Early Jurassic

Ichthyosaurs were highly adapted marine reptiles belonging to the order Ichthyosauria, which thrived throughout the Early Jurassic Period. Their streamlined, fish-like bodies, powerful crescent-shaped tails, and large eyes equipped them for life as fast-moving marine hunters. These reptiles evolved a flexible spine composed of numerous vertebrae, enabling efficient lateral movement used for propulsion and rapid acceleration.

The vertebra presented here represents a portion of the axial skeleton, likely from the trunk or caudal region. These bones played a crucial role in maintaining the rigidity and flexibility required for swimming through open marine environments. Their distinctive spool-shaped form is characteristic of ichthyosaurs and provides valuable anatomical insight into their swimming mechanics and evolutionary adaptations.

Geological Setting: Black Ven Marls, Lower Lias

This fossil originates from the Black Ven Marls, a unit within the Lower Lias Group, deposited during the Hettangian–Sinemurian stages of the Early Jurassic, around 196–190 million years ago. The Black Ven Marls and associated mudstones were formed in a calm, offshore marine basin with low oxygen levels—ideal for preserving vertebrate remains.

The Jurassic Coast at Lyme Regis is a globally significant site for marine reptile fossils. The continuous erosion of the cliffs exposes new material each year, echoing the legacy of pioneering fossil hunter Mary Anning. Black Ven is particularly known for yielding ichthyosaurs, with vertebrae such as this one representing some of the most recognisable remains from the locality.

Morphology and Notable Characteristics

This vertebra displays the classic amphicoelous (biconcave) shape found in ichthyosaurs. Its smooth concave articular surfaces reflect the high degree of spinal flexibility that made these reptiles proficient swimmers. The spool-like geometry helped distribute stress throughout the axial column, supporting both streamlined movement and rapid turning when chasing prey.

Other notable features include:

• Robust centrum construction, suited to resisting torsional forces
• Fine surface texture, typical of Early Jurassic marine reptile bone
• Natural mineralisation, reflecting its long burial within the Black Ven Marls
• Symmetrical lateral contours, consistent with ichthyosaur vertebral morphology

These characteristics make the fossil a scientifically meaningful piece as well as an attractive display item.

Depositional Environment and Palaeoecology

During the Early Jurassic, the area that is now the Dorset coastline lay beneath a warm, shallow sea filled with fish, ammonites, crustaceans, and cephalopods. Ichthyosaurs, including the species from which this vertebra originated, were apex marine predators in this ecosystem.

The fine-grained sediments of the Black Ven Marls settled in low-energy conditions, allowing bones to fossilise undisturbed. The anaerobic (low-oxygen) environment reduced decomposition and inhibited scavengers, preserving skeletal elements with remarkable clarity. Vertebrae such as this one offer insight into the biomechanics, growth patterns, and evolutionary adaptations of ichthyosaurs during the Lower Jurassic.

Collector Appeal and Display Value

This Ichthyosaur Vertebra Fossil is an excellent addition for collectors, educators, and palaeontology enthusiasts seeking authentic specimens from one of the most historically significant fossil sites in the world. Its iconic morphology, strong preservation, and world-class locality make it a standout piece suitable for both scientific interpretation and decorative display.

The careful preparation by Alison highlights the vertebra’s natural form while maintaining its integrity. Whether displayed in a cabinet, used for educational purposes, or added to a marine reptile collection, this fossil offers a direct and fascinating connection to the ancient oceans of the Jurassic.

All of our Fossils are 100% Genuine Specimens & come with a Certificate of Authenticity.