Description
This listing offers a Fossil Ammonite, Oppelia (Oppelia) subradiata, from the Middle Bajocian stage of the Middle Jurassic Period, approximately 169–168 million years old. Discovered at Loders Cross, Dorset, United Kingdom, this specimen is both scientifically significant and visually striking. The Dorset region is one of Britain’s classic fossil localities, well known for yielding ammonites that are vital to biostratigraphy and palaeontological study.
All of our fossils are 100% genuine specimens and come with a Certificate of Authenticity. The exact fossil you see in the photographs is the one you will receive, with a 1 cm scale cube and rule squares included to provide accurate size reference.
Geological Context and Age
This ammonite originates from the Middle Bajocian stage of the Middle Jurassic, dating to around 169–168 million years ago. At this time, southern England was submerged beneath shallow, warm seas connected to the Tethys Ocean. These marine environments were rich in ammonites, belemnites, brachiopods, and early marine reptiles.
The Loders Cross site in Dorset is a well-documented Jurassic locality, producing finely preserved ammonites of international significance. These deposits belong to the Inferior Oolite Group, a sequence of shallow marine limestones and associated sediments that preserve a diverse range of fossilised life. Fossils from this region are particularly important for defining biostratigraphic zones, which are used to correlate Middle Jurassic rocks across Europe.
Morphology and Distinctive Features
Oppelia (Oppelia) subradiata belongs to the family Oppeliidae, within the superfamily Haploceratoidea of the order Ammonitida. It is characterised by a discoidal, compressed shell, with tightly involute coiling that hides the earlier whorls. The species shows fine ribbing (sub-radial ornamentation) across the flanks, which becomes faint or disappears near the venter.
This specimen displays the diagnostic features of Oppelia subradiata: an elegant discoidal form, smooth to lightly striated flanks, and a narrow rounded venter. The streamlined morphology reflects a nektonic lifestyle, meaning this ammonite was an active swimmer, capable of hunting small crustaceans and fish in the open waters of the Jurassic seas.
Scientific Importance
Oppelia subradiata is an important index fossil for the Middle Bajocian stage. Its clearly defined stratigraphic range makes it essential for geologists to date and correlate Jurassic rock formations across wide areas. Ammonites of this genus are integral to refining the Jurassic timescale and are frequently used in biostratigraphy.
The presence of Oppelia subradiata in the deposits of Dorset highlights the significance of the region in global palaeontology. The Dorset coast and its inland localities such as Loders Cross have long been studied by geologists and continue to yield specimens that advance our understanding of ammonite evolution and Jurassic ecosystems.
Collector and Display Value
This Oppelia subradiata ammonite fossil from Loders Cross, Dorset, is a specimen of both scientific and aesthetic appeal. Its elegant, compressed shell and fine ribbing make it a striking display piece, while its well-documented provenance enhances its value for collectors.
For those with an interest in British fossils, ammonites, or Jurassic stratigraphy, this ammonite represents a particularly desirable acquisition. It is equally suited for inclusion in private collections, teaching sets, or museum displays, where it can illustrate both the diversity of ammonites and their critical role in the geological record.
Your Guarantee of Authenticity
- 100% genuine Oppelia (Oppelia) subradiata ammonite fossil from Loders Cross, Dorset, United Kingdom
- Geological age: Middle Bajocian stage, Middle Jurassic (approx. 169–168 million years old)
- From the Inferior Oolite Group deposits of Dorset
- Supplied with a Certificate of Authenticity
- Exact specimen shown in photographs (no stock images used)
- Scale cube and rule squares = 1 cm (see photos for accurate sizing)
This Oppelia subradiata ammonite fossil is a scientifically valuable and beautifully preserved specimen from Dorset’s Middle Bajocian deposits. With its provenance, authenticity, and elegant morphology, it is an exceptional addition to any fossil collection.
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