Description
Cenoceras gervillei Nautiloid Fossil – Genuine Upper Jurassic Specimen
This is a genuine Cenoceras gervillei nautiloid fossil from the Upper Jurassic, Oxfordian stage of France. Dating to approximately 164 to 157 million years ago, this specimen represents a classic fossil marine cephalopod from the Jurassic seas of Europe. Cenoceras is an extinct nautiloid genus, related to the living chambered nautilus, and is valued by fossil collectors for its elegant coiled shell form, long evolutionary history, and strong connection to ancient marine environments.
This fossil is a carefully chosen specimen, with the photograph showing the actual fossil you will receive. It also includes a Certificate of Authenticity lifetime guarantee generic card, making it an excellent choice for fossil collectors, geology students, natural history displays, educational collections, and anyone interested in genuine Jurassic marine fossils.
Geology, Age and Location
This nautiloid comes from the Oxfordian stage of the Upper Jurassic in France. During the Oxfordian, much of Europe was covered by warm, shallow epicontinental seas. These marine environments supported a rich and diverse fauna, including ammonites, nautiloids, belemnites, bivalves, brachiopods, echinoids, crinoids, corals, sponges, fish, and marine reptiles.
France is well known for its Jurassic fossil deposits, with Oxfordian strata producing many attractive and scientifically important marine fossils. These rocks record a time when carbonate platforms, muddy seabeds, reefs, lagoons, and open marine settings spread across parts of western Europe. Nautiloids such as Cenoceras lived alongside the more abundant ammonites, forming part of the wider cephalopod community of the Jurassic seas.
Fossil Type and Species
Cenoceras gervillei is a nautiloid, a shelled cephalopod related to modern Nautilus, as well as to ammonites, squid, cuttlefish, and octopus. Nautiloids are among the most successful and long-lived cephalopod groups in the fossil record. They first appeared far earlier in the Palaeozoic and survived the end-Cretaceous extinction event that eliminated ammonites.
Cenoceras belongs to the order Nautilida and is part of the family Cenoceratidae, a group of Mesozoic nautiloids recognised for their coiled chambered shells. The shell was divided internally by walls called septa, creating a series of chambers. The living animal occupied the outer body chamber, while the older internal chambers helped regulate buoyancy through gas and fluid control. This allowed the animal to move through the water column and live as an active marine predator or scavenger.
Morphology and Collector Appeal
Cenoceras is recognised for its rounded, coiled shell form and classic nautiloid appearance. Unlike many ammonites, which often display complex ribbing, spines, keels, or intricate suture patterns, nautiloids such as Cenoceras generally have a smoother and more robust shell shape. This gives the fossil a clean, natural geometry that is highly appealing for display.
The shell of Cenoceras is typically involute to moderately involute, with the outer whorl partly covering the earlier whorls. The whorl profile is rounded, and the suture lines are simpler than those seen in ammonites. These features make the fossil especially useful for comparing nautiloids with ammonites, two major groups of ancient cephalopods that shared Jurassic marine environments but followed different evolutionary paths.
Depending on preservation, specimens may show natural shell contour, internal mould detail, chamber structure, or mineralised surfaces. Each fossil has its own individual character, shaped by burial, mineral replacement, and the conditions of the ancient seabed.
Depositional Environment
During the Oxfordian, the region that is now France lay beneath warm Jurassic seas with a wide range of marine habitats. Fine sediments accumulated on the seabed, while shelled cephalopods moved through the water above. Cenoceras would have lived in this marine ecosystem alongside ammonites and belemnites, using its chambered shell for buoyancy and its tentacled body for feeding.
After death, the shell could settle onto the seabed, become buried by sediment, and slowly fossilise over millions of years. The preservation of nautiloids in Jurassic rocks provides a direct link to these ancient seas and helps illustrate the diversity of marine life long before humans, modern mammals, or flowering plants became dominant.
A fossil nautiloid from the Oxfordian of France is therefore both an attractive display piece and a meaningful geological specimen. It represents a surviving branch of cephalopod evolution, closely connected to the modern chambered nautilus, yet preserved from a world ruled by dinosaurs on land and marine reptiles in the oceans.
Authenticity and Display
All of our fossils are 100% genuine specimens and come with a Certificate of Authenticity. This Cenoceras gervillei nautiloid fossil is supplied with a lifetime guarantee generic COA card for confidence and peace of mind.
Full sizing: please see photo.
The fossil shown in the photograph is the actual specimen you will receive. This genuine Upper Jurassic Cenoceras gervillei nautiloid from France is a superb addition to a fossil collection, natural history cabinet, geology teaching set, Jurassic display, or collection of genuine marine cephalopod fossils.
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