Dactylioceras Ammonite Fossil Whitby Jurassic UK Positive Negative Specimen Authentic Certified

Description

Genuine Dactylioceras Fossil Ammonite from Whitby

This striking Dactylioceras Fossil Ammonite, preserved with both positive and negative impressions, originates from the world-renowned fossil locality of Whitby, Yorkshire, United Kingdom. Dating to the Middle Lias of the Early Jurassic period, approximately 180 million years ago, this specimen captures a classic example of one of Britain’s most iconic ammonites.

The fossil shown in the photographs is the exact specimen you will receive, carefully selected for its natural beauty and scientific interest. It is a genuine fossil and includes a Certificate of Authenticity lifetime guarantee card, providing complete assurance of authenticity and provenance.

Geological Setting & Age

This ammonite comes from the Whitby Mudstone Formation, part of the Middle Lias sequence formed during the Toarcian stage of the Early Jurassic. At this time, much of what is now Yorkshire was submerged beneath a shallow marine sea, where fine sediments accumulated on the seabed.

The depositional environment was relatively low in oxygen, which helped preserve marine life in remarkable detail. Over millions of years, these sediments lithified into shale and mudstone, encasing ammonites and other marine organisms. Whitby remains one of the most important fossil sites in the UK, known for its abundance and quality of Jurassic fossils.

Classification & Natural History

Dactylioceras belongs to the family Dactylioceratidae, within the order Ammonitida. These extinct marine cephalopods were closely related to modern squid and octopus, but possessed coiled external shells.

Dactylioceras species are particularly well known for their role as index fossils, commonly used in stratigraphy to identify and correlate rock layers of Early Jurassic age. Their widespread distribution and rapid evolution make them valuable tools for geological dating.

Morphology & Distinctive Features

This ammonite displays the characteristic evolute coiling of Dactylioceras, where each whorl is clearly visible and not tightly enveloped. The shell is ornamented with fine, regular ribs that radiate from the centre outward, often splitting or branching as they extend across the whorl.

One of the most appealing aspects of this specimen is the preservation of both the positive (raised ammonite shell) and the negative (impression left in the surrounding matrix). This dual preservation provides a complete representation of the organism and enhances both its visual and educational value.

The contrast between fossil and matrix highlights the intricate ribbing and overall symmetry of the ammonite, making it an attractive display piece.

Discovery & Preparation

This specimen was discovered by our dedicated team members, Alister and Alison, along the fossil-rich coastline of Whitby. Following careful extraction, it has been professionally cleaned, prepped, and treated by Alison to stabilise the fossil and reveal its finest details.

The preparation ensures the ammonite’s natural features are preserved while maintaining the integrity of both positive and negative impressions, resulting in a high-quality and durable specimen.

Authenticity & Collectability

Every fossil we offer is 100% genuine and ethically sourced. This ammonite comes complete with a Certificate of Authenticity lifetime guarantee card, giving confidence to collectors, educators, and enthusiasts alike.

Dactylioceras ammonites from Whitby are highly collectible due to their classic appearance, historical significance, and excellent preservation. Specimens featuring both positive and negative forms are especially desirable, offering a deeper insight into fossilisation processes.

Display & Presentation

This fossil is ideal for display in a collection, educational setting, or as a unique gift. Its natural form, detailed ribbing, and dual preservation make it a visually engaging and scientifically interesting piece.

Please refer to the photographs for full sizing and condition, as they show the exact specimen you will receive.