Description
Sowerbyceras tortisulcatum Ammonite Fossil – Upper Jurassic Marine Fossil from France
This genuine Sowerbyceras tortisulcatum ammonite fossil comes from the Upper Oxfordian deposits of France, dating to the Upper Jurassic Period. It is a carefully chosen fossil specimen, with the photo showing the actual piece you will receive. Full sizing can be seen in the photo. This authentic fossil also includes a Certificate of Authenticity lifetime guarantee generic card, making it an excellent choice for collectors of ammonites, French fossils, Jurassic marine fossils and natural history display specimens.
Geology and Age
This fossil dates to the Upper Oxfordian Stage of the Upper Jurassic, an important interval in European geological history when warm shallow to moderately deep seas covered large areas of what is now France. These Jurassic seas supported a rich marine ecosystem filled with ammonites, belemnites, bivalves, gastropods, brachiopods, marine reptiles and other prehistoric sea life.
The Oxfordian is especially well known for ammonite-bearing marine sediments across Europe. Ammonites from this stage are highly valued because they evolved rapidly and are useful in dating and correlating Jurassic rock layers. A fossil such as Sowerbyceras tortisulcatum therefore has strong geological interest as well as visual appeal.
During the Late Jurassic, France formed part of a broad marine realm connected to the ancient Tethys Ocean. Fine sediments accumulated on the sea floor, burying shells and organic remains. Over millions of years, these remains were compacted, mineralised and preserved as fossils, giving modern collectors a direct connection to an ancient marine world.
Fossil Type and Species
This specimen is identified as Sowerbyceras tortisulcatum, a species of ammonite from the Upper Jurassic. Ammonites were extinct marine cephalopods, related to modern squid, cuttlefish and nautilus. They lived inside coiled, chambered shells, with the animal occupying the final body chamber while the older inner chambers helped regulate buoyancy.
Sowerbyceras is commonly associated with the phylloceratid ammonites, a group known for elegant shell shapes, refined ornament and complex suture patterns. It belongs within the wider ammonite order Ammonitida and is often placed with the family Phylloceratidae and superfamily Phylloceratoidea. These ammonites were widespread in Jurassic marine environments and are appreciated by collectors for their graceful form and scientific importance.
The species name tortisulcatum refers to the distinctive shell character of this ammonite, with natural grooves, folds or sulcate features that help distinguish it from related forms. Specimens of Sowerbyceras are often admired for their smooth to finely ornamented appearance and their balanced, classic ammonite shape.
Morphology and Natural Features
Sowerbyceras tortisulcatum typically displays a planispiral coiled shell, meaning the shell grew in a flat spiral. The whorls are often relatively rounded to compressed, with a neat, elegant profile. Depending on preservation, the fossil may show fine growth lines, subtle ornament, curved grooves or traces of the original shell surface.
Like other ammonites, the shell was divided internally into chambers by walls called septa. Where these septa met the outer shell wall, they formed complex suture lines. These sutures are important in ammonite classification and are one of the features that make ammonites such fascinating fossils for scientific study.
As a living animal, Sowerbyceras tortisulcatum would have moved through Jurassic seas using buoyancy control and jet propulsion. It would have formed part of the marine food web as a cephalopod predator or opportunistic hunter, sharing its environment with other ammonites, belemnites, fish and marine reptiles.
Collector Appeal
A Sowerbyceras tortisulcatum ammonite from the Upper Oxfordian of France is a desirable fossil for collectors who appreciate named Jurassic ammonites, European fossils and genuine marine specimens with strong geological context. Its Upper Jurassic age places it within one of the most famous periods of ammonite diversity, making it ideal for display alongside other Jurassic fossils.
This specimen would make an excellent addition to a fossil cabinet, geology collection, educational display, natural history collection or themed ammonite collection. Its French origin, named species identification and attractive ammonite form make it suitable for both experienced collectors and those looking for a genuine prehistoric display piece.
Authenticity and Presentation
This is a genuine fossil specimen and includes a Certificate of Authenticity lifetime guarantee generic card for buyer confidence. The fossil has been carefully selected, and the listing photograph shows the actual specimen you will receive, allowing buyers to view its natural preservation, shape and individual character before purchase.
This authentic Upper Jurassic Sowerbyceras tortisulcatum ammonite fossil from the Upper Oxfordian of France is ideal for fossil collectors, ammonite enthusiasts, geology displays and anyone seeking a genuine piece of prehistoric marine life.
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