Description
Ludwigia sinon Ammonite Fossil from Dorset
Genuine Lower Bajocian Fossil
This listing is for the exact Ludwigia sinon ammonite fossil shown in the photographs. It is a genuine natural specimen from Dorset, UK, preserved in rocks of the Inferior Oolite Group and dating to the Lower Bajocian Stage of the Middle Jurassic. Every fossil is individually selected and photographed, so the specimen pictured is the actual fossil you will receive. Please use the dedicated sizing photograph for full measurements and study all images for the specimen’s individual preservation, colour and natural matrix.
Jurassic Geology of Dorset
The Lower Bajocian represents an interval of the Middle Jurassic approximately 171 to 168 million years ago. At that time, the area that is now southern England was influenced by warm, shallow marine environments. Sediments accumulated on the sea floor and were later compacted and cemented into the limestones, iron-rich beds, sands and marls associated with the Inferior Oolite Group. These rocks preserve an important record of changing sea levels, marine communities and sedimentary conditions.
Dorset is internationally celebrated for its Jurassic geology. Ammonites from the county provide a direct link to the ancient seas that once covered the region and are valued for both their scientific context and their visual appeal. The specimen’s recorded locality and stratigraphic information make it a meaningful addition to a carefully documented fossil collection.
About Ludwigia sinon
Ludwigia is an extinct genus of ammonoid cephalopod. Ammonites were marine molluscs with chambered shells, related within the wider cephalopod group to living squid, cuttlefish and nautiluses. The animal occupied the final body chamber, while internal chambers divided by septa assisted with buoyancy. The shell grew as a spiral, producing successive whorls around the centre.
Ludwigia ammonites are known for their planispirally coiled form and distinct ribbing. The shell’s ornament can change during growth, with the inner and outer whorls showing differences in rib strength and spacing. Natural fossilisation and preparation reveal these structures to varying degrees. The photographs accurately show the actual surface detail, completeness, mineral tones and any remaining host rock on this specimen.
Scientific and Display Value
Ammonites are especially useful to geologists because many forms evolved rapidly and were distributed across broad marine areas. Particular species and assemblages can help correlate rock layers and refine relative ages within the Jurassic succession. A correctly provenanced Lower Bajocian ammonite therefore carries educational and geological interest beyond its decorative appearance.
This Ludwigia sinon fossil would suit an established palaeontology collection, a natural history cabinet, a geology teaching display or a distinctive gift for a fossil enthusiast. Its sculptural spiral form also makes it an attractive conversation piece, while its geological data connects it securely to the Middle Jurassic history of Dorset.
Exact Specimen and Certificate
You will receive the exact fossil shown rather than a stock example. Fossils are natural objects and may retain ancient fractures, matrix, mineral variation, weathered areas or preparation marks that form part of their authentic history. Review the photographs carefully for condition and refer to the sizing image for dimensions.
A generic Certificate of Authenticity card with a lifetime guarantee is included. The specimen will be packed carefully for safe transit, helping it arrive in the same condition in which it was photographed.
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