Hammatoceras praefallax Ammonite Fossil France Toarcian with COA

Description

Genuine Hammatoceras Ammonite Fossil

This genuine ammonite fossil is identified as Hammatoceras praefallax and comes from Rouffiac in Occitanie, France. It dates to the Upper Toarcian interval of the Jurassic and is a carefully selected European specimen with valuable species, geological age, and locality information. The photographs show the actual fossil offered for sale, so the ammonite pictured is the exact specimen you will receive.

Hammatoceras was an extinct marine cephalopod with a coiled, chambered shell. As the animal grew, it added progressively larger chambers around the outer whorl. The living ammonite occupied the final body chamber, while older sealed chambers contributed to buoyancy control. Ammonites were relatives of living squid, cuttlefish, and nautiluses, although they formed their own extinct and remarkably diverse group.

Upper Toarcian Geological Age

The Toarcian is the final stage of the Early Jurassic Period, approximately 184 to 174 million years ago. During its later part, marine environments extended across large areas of Europe and supported varied ammonites, bivalves, brachiopods, belemnites, fish, and other sea life. After death, an ammonite shell could settle on the sea floor and become buried within sediment. Compaction, mineral replacement, and geological change then preserved parts of the shell as a fossil.

The Toarcian includes important environmental and biological changes in ancient oceans. Ammonites evolved rapidly through this interval, and their changing shell forms help geologists compare sedimentary sequences and establish relative ages. The documented Upper Toarcian age gives this specimen a clear place near the close of the Lower Jurassic.

Rouffiac, Occitanie Provenance

Rouffiac lies within the Occitanie region of southern France, an area with sedimentary rocks that preserve a rich record of Jurassic marine life. A specimen with documented locality information carries more collecting and educational context than an entirely unlocalised fossil. It can complement a collection arranged by French region, Jurassic stage, ammonite genus, or ancient marine environment.

Marine sediment helped protect portions of the shell and surrounding matrix. Natural colour, mineral texture, small breaks, areas of wear, and differences in surface preservation reflect the specimen’s long geological history. These characteristics are authentic features of an ancient fossil rather than signs of modern manufacture.

Ribbed Shell and Collectable Detail

Hammatoceras ammonites are recognised for their strongly ornamented shells, commonly showing prominent ribs and a keeled outer margin. Examine the photographs for visible whorls, rib pattern, shell outline, keel, umbilical region, matrix, and preserved surface details on this individual example. Rib strength, branching pattern, whorl proportions, and changes in ornament around the shell are useful characteristics when comparing ammonites and interpreting growth.

Every fossil preserves a different balance of original shell, mineral replacement, and surrounding rock. The multiple photographs show the exact specimen from useful angles and present its condition, proportions, texture, and natural display character more accurately than a generic image could.

Exact Specimen and Full Sizing

Full sizing is shown in the photographs, which provide the best scale information for this individual fossil. The images are not stock photographs and do not represent a similar piece. They show the exact Hammatoceras praefallax ammonite fossil that will be supplied.

Authenticity and Presentation

This is a genuine fossil specimen and includes a generic Certificate of Authenticity card with a lifetime guarantee. It has been carefully chosen for its identifiable ornamented shell, Upper Toarcian age, Rouffiac locality, French provenance, and natural geological character. It makes a distinctive addition to a cabinet collection, educational display, office, study, or gift for anyone interested in authentic Jurassic fossils, French palaeontology, or ammonite evolution.