Description
This listing offers a rare and beautifully preserved 4.5-inch fossil ammonite, Sonninia (Euhoploceras) adicrum, from the Middle Bajocian Stage of the Jurassic Period, discovered in Bradford Abbas, Dorset, United Kingdom. The photograph shows the actual specimen you will receive. Each cube in the scale photo represents 1cm — see image for full sizing.
This is a scientifically valuable and display-worthy fossil, ideal for collectors, academic use, or museum-quality exhibits.
All of our Fossils are 100% Genuine Specimens & come with a Certificate of Authenticity.
Geological & Scientific Information:
- Fossil Type: Ammonite
- Species: Sonninia (Euhoploceras) adicrum
- Order: Ammonitida
- Superfamily: Stephanoceratoidea
- Family: Sonniniidae (sometimes considered Graphoceratidae in some classifications)
- Geological Stage: Middle Bajocian (approx. 168.3 – 166.1 million years ago)
- Biozone: Likely part of the Humphriesianum Zone, associated with the upper Bajocian ammonite succession in Dorset
- Period: Jurassic
- Locality: Bradford Abbas, Dorset, England, UK
- Depositional Environment: Shallow marine shelf of the Wessex Basin, characterised by marl and fine-grained limestone beds formed under low-energy conditions
Morphology & Notable Features:
- Strongly ribbed, moderately involute shell with compressed whorl section
- Ribbing typically bifurcates at the umbilical edge and extends cleanly across the flanks
- Venter often slightly rounded with well-defined keel or rib continuity
- Typical of Euhoploceras subgenus: elegant curvature and dense ornamentation
- Excellent preservation allows for study of both ornament and suture lines
Scientific Significance: Sonninia (Euhoploceras) adicrum is a biostratigraphically significant ammonite, often used in correlating strata within the Middle Jurassic across Europe. It contributes to the understanding of the evolution of the Sonniniidae lineage and is a marker for the upper part of the Bajocian sequence.
Originally described in 19th-century European ammonite monographs, this species is sought after by collectors due to its aesthetic appeal and clear stratigraphic context in southern England.
Ideal For:
- Serious fossil and ammonite collectors
- Stratigraphic and biostratigraphic reference collections
- Natural history display or academic study
What You Will Receive:
- The exact Sonninia (Euhoploceras) adicrum fossil shown
- Certificate of Authenticity
- Secure, protective packaging for safe delivery
Feel free to contact us with any questions. We’re always happy to assist with further details or help expand your fossil collection.
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