Australorbis euomphalus Gastropod Fossil Block Isle of Wight Eocene Genuine Specimen Authentic

Description

Specimen Overview

This exceptional Australorbis euomphalus gastropod fossil block is a genuine specimen from the renowned fossil-bearing deposits of Totland Bay on the Isle of Wight. Preserved within its natural matrix, this piece showcases multiple fossilised gastropods in situ, offering both strong visual appeal and valuable geological context. The exact specimen shown in the photographs is the one you will receive, carefully selected for quality and presentation.

Discovered by our dedicated team members, Alister and Alison, this fossil has been expertly cleaned, prepped, and treated by Alison to enhance its natural features while maintaining its integrity. The specimen includes a Certificate of Authenticity with a lifetime guarantee, ensuring confidence in its provenance.

Geological Origin – Headon Hill Formation, Isle of Wight

This fossil originates from the Hatherwood Limestone Member of the Headon Hill Formation, located at Totland Bay on the Isle of Wight, UK. These deposits date to the Eocene epoch, approximately 56 to 34 million years ago, during a period of significant climatic warmth and ecological diversity.

The Headon Hill Formation is well known for its alternating freshwater, brackish, and lagoonal sediments, consisting of limestones, marls, and clays. The Hatherwood Limestone Member in particular represents a shallow, calm-water depositional environment where fine sediments allowed for the exceptional preservation of delicate shells and other organic remains.

Fossil Identification – Australorbis euomphalus

This specimen features Australorbis euomphalus, historically referred to as Planorbis, a freshwater gastropod belonging to the family Planorbidae within the order Hygrophila. These gastropods are characterised by their distinctive planispiral shells, which coil in a flat, disc-like form.

Key identifying features include:

• Flattened, coiled shell with a symmetrical spiral
• Smooth to gently ornamented surface
• Central umbilicus visible due to the planispiral structure
• Thin but well-defined shell walls

These morphological traits make Australorbis euomphalus easily recognisable and highly desirable for collectors interested in freshwater fossil assemblages.

Morphology and Preservation

This fossil block preserves multiple gastropods embedded within the original limestone matrix, providing an authentic snapshot of the ancient environment. The shells display their characteristic coiled structure, with fine details visible in the preserved forms.

The limestone matrix enhances both the stability and aesthetic appeal of the specimen, offering a natural contrast that highlights the fossil shells. The preservation quality reflects the calm depositional conditions of the Hatherwood Limestone, where minimal disturbance allowed delicate structures to fossilise intact.

Paleoenvironment and Depositional Setting

During the Eocene, the Isle of Wight region was dominated by a warm, subtropical climate with extensive lagoons, freshwater lakes, and coastal plains. The Headon Hill Formation records these changing environments, with the Hatherwood Limestone representing a tranquil freshwater or slightly brackish setting.

Australorbis euomphalus thrived in these calm waters, grazing on algae and organic material. The accumulation of shells within the sediment suggests a stable ecosystem with abundant life, periodically buried by fine carbonate sediments that preserved them in detail.

Authenticity and Preparation

This fossil is a genuine natural specimen, not a cast or reproduction. It has been carefully prepared by Alison to ensure that the fossil shells are clearly visible while retaining their natural matrix. The included Certificate of Authenticity with lifetime guarantee confirms its legitimacy and adds value for collectors.

All images show the exact specimen, allowing you to fully appreciate its quality, composition, and detail before purchase.

Collectability and Display Appeal

Gastropod fossil blocks from the Headon Hill Formation are highly collectible due to their excellent preservation and scientific importance. Specimens featuring Australorbis euomphalus are particularly desirable for their distinctive morphology and representation of Eocene freshwater ecosystems.

This piece offers both educational value and visual impact, making it ideal for display in a collection, study environment, or as a unique natural history gift. Its combination of multiple fossils within a single matrix block provides a compelling and authentic glimpse into life millions of years ago.