Description
Hammatoceras subinsigne Ammonite Fossil – Genuine Lower Jurassic Specimen
This is a genuine Hammatoceras subinsigne ammonite fossil from Lyon, France. Dating to the Upper Toarcian stage of the Lower Jurassic, this specimen represents a highly collectable marine cephalopod from the ancient Jurassic seas of western Europe. Hammatoceras is a distinctive Jurassic ammonite genus valued by fossil collectors for its classic coiled shell, strong ribbing, and importance within Toarcian ammonite faunas.
This fossil is a carefully chosen piece, with the photograph showing the actual specimen 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 ammonites from France.
Geology, Age and Location
This ammonite comes from Lyon, France, an area associated with fossiliferous Jurassic marine deposits. The specimen is dated to the Upper Toarcian, part of the Lower Jurassic, approximately 182 to 174 million years ago. During this time, much of western Europe was covered by warm epicontinental seas, with shallow to moderately deep marine environments spreading across what is now France.
The Toarcian is an especially important stage in Jurassic geology because it preserves diverse ammonite faunas that are widely used for biostratigraphy. Ammonites evolved rapidly and were distributed across broad marine areas, making them extremely useful for identifying and correlating rock layers. A genuine Hammatoceras from this interval is therefore not only an attractive display fossil, but also a meaningful geological specimen from a well-defined period in Earth history.
Fossil Type and Species
Hammatoceras subinsigne is an ammonite, an extinct marine cephalopod related to modern squid, cuttlefish, octopus, and nautilus. Ammonites had coiled, chambered shells divided internally by walls called septa. The living animal occupied the final outer body chamber, while the earlier internal chambers helped control buoyancy as it moved through the water column.
Hammatoceras belongs to the ammonite order Ammonitida and is associated with the family Hammatoceratidae, a group of Lower Jurassic ammonites known for their robust shell forms and ornamented whorls. Hammatoceratid ammonites are important in Toarcian marine successions and are recognised for their role in showing the diversity of ammonite evolution during the Early Jurassic.
Morphology and Collector Appeal
Hammatoceras ammonites typically display the classic planispiral ammonite shape, with the shell coiled in a flat spiral around a central umbilicus. Depending on preservation and growth stage, examples may show rounded to moderately compressed whorls, strong ribbing, a defined outer margin, and natural internal mould detail. The ribs can be prominent across the flanks and may vary in strength or spacing as the animal grew.
These features give Hammatoceras subinsigne strong collector appeal. The shell form is instantly recognisable as an ammonite, while the ribbing and whorl structure provide clear evidence of the animal’s growth and shell architecture. Jurassic ammonites are among the most popular fossils for display because they combine natural symmetry, geological age, and clear palaeontological character.
This specimen is also useful for educational purposes, helping to explain ammonite anatomy, cephalopod evolution, marine fossilisation, and the role of ammonites in dating Jurassic rocks. As a genuine Lower Jurassic ammonite from France, it pairs well with other marine fossils such as belemnites, nautiloids, bivalves, brachiopods, and echinoids from the same broad period.
Depositional Environment
During the Upper Toarcian, the Lyon region lay within a broad marine setting connected to the Jurassic seas of Europe. Ammonites such as Hammatoceras lived in the water column, using their chambered shells to regulate buoyancy while feeding as active predators or scavengers. These seas supported a rich ecosystem of belemnites, nautiloids, bivalves, brachiopods, gastropods, fish, and other marine organisms.
After death, the ammonite shell could settle onto the seabed and become buried by sediment. Over millions of years, compaction, mineralisation, and geological change preserved the remains as a fossil. This process created a lasting record of an ancient marine world that existed long before humans, modern landscapes, or flowering plants became dominant.
Authenticity and Display
All of our fossils are 100% genuine specimens and come with a Certificate of Authenticity. This Hammatoceras subinsigne ammonite 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 Toarcian Hammatoceras subinsigne ammonite from Lyon, France is a superb addition to a fossil collection, natural history cabinet, geology teaching set, Jurassic display, or collection of genuine European marine cephalopod fossils.
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