Description
Hammatoceras simplex Ammonite Fossil
A Genuine Toarcian Fossil from France
This authentic ammonite fossil is identified as Hammatoceras simplex and comes from Venette in France. It dates to the Toarcian stage of the Lower Jurassic, linking it to a marine ecosystem approximately 175 to 180 million years old. The listing photographs show the exact specimen offered for sale, allowing its natural coiling, ribbing, matrix and individual preservation to be examined before purchase. Full dimensions are provided in the dedicated sizing photograph.
Toarcian Geology
The Toarcian was the final stage of the Early Jurassic and lasted from approximately 182.7 to 174.1 million years ago. During this interval, warm epicontinental seas covered substantial areas of western Europe and connected with the developing Tethys Ocean. Limestone, marl and other marine sediments accumulated across shelves and deeper basins, preserving ammonites, bivalves and many other organisms.
The Toarcian rock record documents important environmental changes and evolutionary turnover among marine faunas. Ammonites responded with the appearance, spread and disappearance of distinctive lineages. Their rapid evolution and broad geographical distribution make them valuable index fossils for comparing sedimentary sequences and refining geological ages. A specimen with recorded locality and stage data consequently retains meaningful scientific context.
Venette Provenance
Venette is located in northern France, within a wider region where sedimentary rocks preserve evidence of ancient Jurassic seas. Fossils from a recorded locality can be connected to regional geology rather than being treated only as isolated decorative objects. Retaining the Venette provenance with this specimen preserves an important part of its geological story and distinguishes it from ammonites whose precise origin has been lost.
About Hammatoceras simplex
Hammatoceras is a Toarcian ammonite genus recognised through features of its shell proportions, coiling, ornament and suture pattern. Hammatoceras simplex forms part of the diverse cephalopod communities that occupied late Early Jurassic seas. Ribbing and other surviving surface details record aspects of shell growth and help palaeontologists compare specimens and identify ammonite groups.
As the ammonite grew, it added new shell material around the aperture. The living cephalopod occupied the outer body chamber, while older portions were divided internally by septa into sealed chambers. These chambers assisted with buoyancy control. Complex lines formed where the septa met the outer shell, called sutures, are important features used in ammonite classification.
Ammonites were extinct marine relatives of living squid, cuttlefish and nautiluses. The chambered shell provided both protection and buoyancy, while the animal likely moved through the water using jet propulsion. Hammatoceras simplex therefore offers genuine scientific interest as evidence of Toarcian cephalopod diversity as well as visual appeal for a fossil display.
Natural Preservation
This fossil has passed through burial, mineralisation, compaction, erosion, exposure and discovery. Natural matrix, mineral colour, weathering, fine cracks, minor losses or uneven surfaces may be present. These characteristics belong to the specimen’s geological history and are not modern manufacturing defects. Please inspect every image carefully because the photographs provide the clearest guide to this individual ammonite’s condition. The fossil pictured is the exact specimen you will receive, and no substitute will be supplied.
Collecting and Educational Value
This French Toarcian ammonite is suitable for a Jurassic fossil collection, geology cabinet, palaeontology display or educational study set. Its species identification and Venette provenance make it particularly relevant to collectors interested in European ammonites, Lower Jurassic marine life, French geology or cephalopod evolution. It can also make a thoughtful gift for a fossil enthusiast, geology student or natural-history collector.
Authenticity and Provenance
This is a carefully selected genuine fossil specimen. It includes a generic Certificate of Authenticity card carrying a lifetime guarantee of authenticity. The documented provenance is Toarcian, Lower Jurassic, Venette, France. Keeping these details with the fossil will preserve an important part of its scientific and historical value. The photographs show the actual Hammatoceras simplex offered here, and the sizing image provides the measurements needed for storage or display planning.
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