Description
Osterlioceras sp. Ammonite Fossil from Aveyron, France
This genuine Osterlioceras sp. ammonite fossil comes from Aveyron, France, and dates to the Toarcian Stage of the Lower Jurassic. It is a carefully chosen fossil specimen, supplied with a Certificate of Authenticity lifetime guarantee generic card. Full sizing can be seen in the photo, and the image shows the actual fossil specimen you will receive.
Osterlioceras ammonites are collectable Lower Jurassic fossils, valued for their scientific interest, classic marine origin and attractive ammonite form. Specimens from French Jurassic deposits are especially desirable for collectors of European ammonites, Toarcian fossils, fossil cephalopods and natural history display pieces.
Species and Scientific Interest
Osterlioceras sp. is an extinct ammonite belonging to the ammonoid cephalopods, a group of marine molluscs related to modern squid, cuttlefish and nautilus. Ammonites lived in ancient seas and produced coiled, chambered shells. The living animal occupied the outer body chamber, while the internal chambers helped regulate buoyancy as it moved through the water column.
The “sp.” after Osterlioceras means the specimen has been identified to genus level, while the exact species is not specified. This is a standard scientific way of labelling fossils when the genus can be recognised but the specimen is best kept open at species level. Genus-level ammonites are still highly collectable, particularly when they come from a clearly labelled locality and geological stage.
Osterlioceras is associated with Toarcian ammonite faunas of the Lower Jurassic. Ammonites from this interval are important in palaeontology because their shell forms evolved rapidly and can be used to help date and correlate Jurassic rock layers. This makes ammonites not only attractive fossils, but also important guide fossils for understanding Earth history.
Lower Jurassic Toarcian Geology
This fossil dates to the Toarcian Stage of the Lower Jurassic, approximately 174 to 183 million years old. During the Toarcian, much of western Europe was covered by warm shallow to moderately deep marine environments. These seas supported a wide variety of marine life, including ammonites, belemnites, bivalves, brachiopods, gastropods, fish and marine reptiles.
The Toarcian is a particularly important interval in Jurassic geology because it records major changes in marine environments, sea levels and sedimentation. Many Toarcian deposits contain dark shales, marls, limestones and other marine sediments that accumulated on ancient sea floors. These conditions allowed ammonites and other shelled organisms to be preserved as fossils.
Ammonites such as Osterlioceras are especially useful in the study of the Toarcian because they help divide the rock sequence into biostratigraphic zones. Their wide distribution across ancient European seas allows comparisons between different fossil localities, making them valuable for both scientific study and educational collections.
Locality: Aveyron, France
This specimen comes from Aveyron, France, a region with fossil-bearing Jurassic sedimentary rocks. During the Lower Jurassic, this part of France lay within a marine setting connected to wider European seas. Sediments deposited in these waters later formed fossil-rich strata that preserve evidence of ancient marine ecosystems.
French Jurassic ammonites are popular with collectors because of their variety, geological importance and often attractive preservation. A labelled specimen from Aveyron adds useful locality information to a fossil collection and is ideal for anyone building a display of French fossils, Lower Jurassic ammonites, Toarcian marine life or European natural history specimens.
Morphology and Display Features
Osterlioceras ammonites show the classic coiled planispiral shell form typical of ammonites. Depending on preservation, the fossil may display visible whorls, ribbing, growth features, natural shell texture and surface detail. These features formed part of the original shell structure and are important for both identification and display.
Natural colours may include cream, beige, grey, brown or iron-rich tones, influenced by the sediment and mineral conditions during fossilisation. Variations in matrix, surface texture, shell detail, rib definition and preservation are part of the fossil’s authentic geological character. As the photo shows the actual fossil you will receive, this is an individual specimen rather than a generic stock example.
Authenticity and Collector Appeal
This Osterlioceras sp. ammonite is a genuine Toarcian Lower Jurassic fossil from Aveyron, France. It includes a Certificate of Authenticity lifetime guarantee generic card, giving confidence to fossil collectors, geology enthusiasts, students and gift buyers.
With its Lower Jurassic age, French locality, Toarcian geological context and classic ammonite form, this fossil would make an excellent addition to a Jurassic fossil collection, European ammonite display, educational geology cabinet, natural history collection or specialist fossil cephalopod suite.
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