Echioceras raricostatum Fossil Ammonite Whitby Jurassic UK Genuine Specimen Certificate Authenticity Upper Toarcian Collector Display

Description

Echioceras raricostatum Fossil Ammonite – Upper Toarcian, Whitby Jurassic Coast

This outstanding fossil ammonite, identified as Echioceras raricostatum, originates from the famous Upper Toarcian deposits of Whitby, North Yorkshire, United Kingdom. Dating to approximately 180 million years ago during the Early Jurassic period, this specimen represents a beautifully preserved example of classic marine life from one of the most important fossil localities in the world.

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 integrity. The fossil shown in the photographs is the exact specimen you will receive, making it a unique and highly collectible piece.

Geological Context and Stratigraphy

Whitby’s Jurassic coastline is globally renowned for its Lias Group sediments, particularly the fossil-rich shales and mudstones of the Toarcian stage. These deposits were formed in a relatively deep marine basin, where fine sediments accumulated slowly under calm conditions. Periodic low-oxygen environments contributed to exceptional fossil preservation, allowing delicate shell structures to remain intact.

Ammonites such as Echioceras raricostatum are key index fossils, widely used in biostratigraphy to identify and correlate specific horizons within the Jurassic sequence. Their rapid evolution and widespread distribution make them invaluable tools for understanding geological time.

Taxonomy and Classification

Echioceras raricostatum belongs to the order Ammonitida and is generally placed within the superfamily Psiloceratoidea, a group representing early evolutionary forms of ammonites. These cephalopods were highly mobile marine predators, closely related to modern squid and octopus.

The genus Echioceras is particularly recognised for its distinctive ribbing patterns and evolutionary significance during the Early Jurassic, bridging earlier simpler forms and more heavily ornamented later species.

Morphology and Shell Features

This specimen displays the classic planispiral coiling typical of ammonites, with clearly defined whorls and a well-proportioned overall structure. The species name raricostatum refers to its relatively widely spaced ribbing, which is a defining characteristic of this ammonite.

The ribs extend across the flanks and may weaken toward the outer margin, creating a refined and elegant appearance. Growth lines are often visible, providing insight into the organism’s development over time.

The shell form is balanced and symmetrical, with a moderately open umbilicus. Natural mineralisation enhances the fossil’s contrast, highlighting the ribbing and structural features that make this species particularly attractive to collectors.

Depositional Environment and Preservation

During the Toarcian stage, the Whitby region was covered by a marine basin where fine-grained sediments settled continuously. Low-energy conditions and reduced oxygen levels at the sea floor limited biological disturbance, allowing ammonite shells to be preserved in exceptional detail.

Alison’s careful preparation has revealed the ammonite’s structure while maintaining aspects of the surrounding matrix for context. The result is a clean, well-defined specimen that retains its natural character and geological authenticity.

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. Every fossil we offer is responsibly sourced and handled directly by our team, providing full traceability from discovery through to final preparation.

Collector Appeal and Display Value

Whitby ammonites are among the most sought-after fossils in the world, valued for their quality, preservation, and historical importance. This Echioceras raricostatum specimen stands out for its distinctive ribbing and elegant form, making it a desirable addition to any collection.

Ideal for collectors of Jurassic fossils, ammonites, or British geological specimens, this piece offers both scientific significance and strong visual appeal. Whether displayed in a cabinet, study, or gallery, it provides a striking connection to the ancient seas that once covered the United Kingdom.