Description
Authentic Orphideroceras ziphoides Fossil
This listing presents a genuine Orphideroceras ziphoides ammonite fossil, discovered in Castle Carey, Somerset, United Kingdom, and dating back to the Upper Sinemurian stage of the Jurassic Period, around 196–190 million years ago. This ammonite is a carefully selected specimen, photographed to show the exact fossil you will receive. A 1 cm scale cube is included in the image for accurate sizing reference. To ensure confidence in its provenance, the fossil comes with a Certificate of Authenticity, certifying that it is a 100% genuine specimen.
Geological Context
The Upper Sinemurian represents a key interval within the Early Jurassic, a time when vast shallow seas extended across much of what is now Europe. The Castle Carey area in Somerset is part of the famous Blue Lias Formation, which has yielded countless world-class ammonites. These marine sediments were deposited in calm, shallow seas, creating near-perfect conditions for fossil preservation. The presence of Orphideroceras ziphoides within these strata makes it scientifically valuable, as it is often used in the subdivision of Sinemurian ammonite zones for biostratigraphic study.
Scientific Classification
- Kingdom: Animalia
- Phylum: Mollusca
- Class: Cephalopoda
- Order: Ammonitida
- Superfamily: Eoderoceratoidea
- Family: Dactylioceratidae
- Genus: Orphideroceras
- Species: Orphideroceras ziphoides
Morphological Features
Orphideroceras ziphoides is characterized by its elegantly ribbed whorls, with ribs that often bifurcate or branch as they sweep across the flanks of the shell. The ornamentation is bold yet finely detailed, making it easily distinguishable from other ammonites of its time. Its compressed coiling and prominent ribbing not only give it scientific importance but also make it visually striking for collectors. This shell design would have provided strength and hydrodynamic efficiency, aiding in buoyancy control and active swimming in the Sinemurian seas.
Paleoenvironment and Ecology
Ammonites such as Orphideroceras ziphoides thrived as nektonic predators in the Early Jurassic seas. They likely fed on small crustaceans, mollusks, and other marine organisms, using their tentacles to capture prey. The Castle Carey region during the Sinemurian was a shallow marine basin influenced by regular sedimentation, which buried and preserved ammonites in fine-grained limestones and shales. This environment produced exceptionally well-preserved fossils, providing paleontologists with key insights into early Jurassic marine ecosystems.
Stratigraphic Importance
As a fossil species confined to the Upper Sinemurian, Orphideroceras ziphoides is an important tool in biostratigraphy, helping scientists establish accurate dating of rock layers. It belongs to ammonite zones that are widely recognized across Europe, enabling geological correlation between distant outcrops. This makes the species highly significant for understanding the stratigraphic framework of the Early Jurassic.
Provenance and Authenticity
This specimen was collected from Castle Carey in Somerset, a locality with an internationally respected reputation for its fossiliferous Jurassic exposures. Every detail of its morphology is preserved, making it both a display-worthy piece and a valuable research specimen. To guarantee confidence, it is sold with a Certificate of Authenticity confirming its status as a genuine fossil.
A Unique Collector’s Specimen
Owning this Orphideroceras ziphoides ammonite fossil is an opportunity to acquire a rare and scientifically important piece of British Jurassic heritage. Its striking ribbed structure, excellent provenance, and authenticity make it a standout specimen for any fossil collection, natural history display, or educational resource.
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