Pseudolioceras compactil Fossil Ammonite Whitby Jurassic UK Genuine Specimen Certificate Authenticity Upper Toarcian Collector Display

Description

Pseudolioceras compactil Fossil Ammonite – Upper Toarcian, Whitby Jurassic Coast

This exceptional fossil ammonite, identified as Pseudolioceras compactil, originates from the world-renowned 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 British ammonite fauna 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 reveal its natural detail while preserving its integrity. The fossil shown in the photographs is the exact specimen you will receive, ensuring a unique and authentic addition to your collection.

Geological Context and Stratigraphy

Whitby’s Jurassic coastline is famed for its rich Lias Group deposits, particularly the Upper Toarcian shales and mudstones. These sediments were laid down in a relatively deep marine basin where fine particles settled slowly on the sea floor. Periodic low-oxygen conditions limited decay and scavenging, allowing delicate organisms such as ammonites to be preserved with remarkable clarity.

Pseudolioceras species are commonly associated with Upper Toarcian ammonite biozones and play an important role in biostratigraphy. Their presence helps geologists accurately identify and correlate rock layers across wide geographic regions.

Taxonomy and Classification

Pseudolioceras compactil belongs to the order Ammonitida and is part of the superfamily Hildoceratoidea, a group known for its streamlined and often finely ornamented shell forms. These marine cephalopods were closely related to modern squid and octopus and were highly adapted to active life in the open ocean.

The genus Pseudolioceras is recognised for its evolutionary significance within the Jurassic, representing a refined form of ammonite adapted to efficient movement through marine environments.

Morphology and Shell Features

This specimen displays the classic planispiral coiling associated with ammonites, with a compact and well-balanced shell form. The whorls are neatly arranged, creating a symmetrical structure that is both visually appealing and scientifically informative.

The shell surface typically exhibits fine ribbing or subtle ornamentation, often more delicate than that seen in more heavily ribbed genera. A defined keel may be present along the outer margin, contributing to hydrodynamic stability as the animal moved through the water.

Growth lines are often visible across the surface, providing insight into the incremental development of the shell. The natural mineralisation enhances contrast and highlights the fine structural details preserved within the fossil.

Depositional Environment and Preservation

During the Toarcian stage, the Whitby region was submerged beneath a marine basin where calm conditions allowed for the accumulation of fine sediments. These conditions, combined with periods of reduced oxygen, created an ideal environment for fossil preservation.

Alison’s careful preparation has revealed the ammonite’s features while maintaining elements of the surrounding matrix for context. The result is a well-defined specimen that retains its natural character and offers both scientific and aesthetic value.

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 fossil 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 globally, prized for their quality, preservation, and historical significance. This Pseudolioceras compactil specimen is an excellent example, combining refined morphology with strong visual appeal.

Ideal for collectors of Jurassic fossils, ammonites, or British geological specimens, this piece makes a striking addition to any collection. Whether displayed in a cabinet, study, or gallery, it provides a tangible connection to the ancient seas that once covered the United Kingdom.