Tragophylloceras numismalis Fossil Ammonite Jurassic Yorkshire UK Genuine Specimen Certificate Authenticity Rare Collector Display

Description

Tragophylloceras numismalis Fossil Ammonite – Pliensbachian Jurassic of Yorkshire

This highly collectible fossil ammonite, identified as Tragophylloceras numismalis, originates from the famous Jurassic exposures of Robin Hood’s Bay, Yorkshire, United Kingdom. Dating to the Pliensbachian stage of the Early Jurassic period, approximately 190 million years ago, this specimen represents a classic example of finely preserved British ammonite fauna.

Discovered by our experienced team members, Alister and Alison, this ammonite has been carefully cleaned, expertly prepared, and treated by Alison to enhance its natural detail while preserving its authenticity. The fossil shown in the photographs is the exact specimen you will receive, making it a unique and desirable addition to any collection.

Geological Context and Stratigraphy

Robin Hood’s Bay is internationally recognised for its rich Lower Jurassic sequences, particularly those within the Lias Group. These sedimentary layers were deposited in a shallow marine environment, where fine muds and silts settled over time, creating ideal conditions for fossil preservation.

The Pliensbachian stage is known for its diverse ammonite assemblages, which are widely used as index fossils in biostratigraphy. Tragophylloceras numismalis is associated with these early Jurassic marine faunas, providing valuable insight into ammonite evolution and distribution during this period.

Taxonomy and Classification

Tragophylloceras numismalis belongs to the order Ammonitida and is part of the superfamily Phylloceratoidea. This group is characterised by smooth, often highly involute shells and represents some of the more primitive ammonite lineages that persisted throughout the Jurassic.

Phylloceratid ammonites like Tragophylloceras are known for their streamlined shell morphology and long stratigraphic range, making them important for understanding evolutionary continuity within ammonoids.

Morphology and Shell Features

This specimen displays the classic features of Tragophylloceras numismalis, including a smooth, planispiral shell with tightly coiled whorls and a relatively narrow umbilicus. Unlike heavily ribbed ammonites, this species is characterised by its elegant, unornamented surface, which gives it a refined and balanced appearance.

The shell may show subtle growth lines and faint undulations, reflecting the organism’s gradual development. Its streamlined form suggests efficient movement through the water column, consistent with an active, nektonic lifestyle.

The natural mineralisation enhances the fossil’s visual appeal, highlighting its smooth contours and symmetry while preserving fine structural detail.

Depositional Environment and Preservation

During the Pliensbachian, the Yorkshire region was submerged beneath a warm, shallow sea rich in marine life. Fine sedimentation and relatively stable conditions allowed delicate shells such as those of Tragophylloceras to be preserved with remarkable clarity.

Alison’s careful preparation has revealed the ammonite’s form while maintaining its natural context within the matrix where appropriate. The result is a well-balanced specimen that is both scientifically valuable and visually striking.

Full sizing details can be confirmed via the accompanying photographs.

Authenticity and Provenance

This fossil is a genuine specimen and includes a Certificate of Authenticity lifetime guarantee card, ensuring complete confidence in its origin and identification. Each piece is responsibly sourced and handled directly by our team, providing full traceability from discovery through to preparation.

Collector Appeal and Display Value

Ammonites from Robin Hood’s Bay are highly prized for their preservation and historical significance. Tragophylloceras numismalis is particularly sought after due to its smooth, elegant form, which contrasts beautifully with more heavily ornamented species.

This specimen is ideal for collectors of Jurassic fossils, ammonites, or British geological specimens. Whether displayed in a cabinet, study, or gallery, it offers a timeless connection to the ancient seas that once covered Yorkshire and stands as a refined and eye-catching centrepiece.