Acanthoceras pseudorenevieri Ammonite Fossil Cretaceous Lower Cenomanian France Genuine Specimen with COA

Description

Acanthoceras pseudorenevieri Ammonite from Montpelier de Médillan, France

This authentic ammonite fossil is a fine example of Acanthoceras pseudorenevieri, a species from the Lower Cenomanian stage of the Cretaceous period. Discovered in the Montpelier de Médillan region of France, this specimen demonstrates the distinctive features of its genus and provides an exceptional glimpse into marine life from over 98 million years ago. As with all our fossils, it is 100% genuine and comes complete with a Certificate of Authenticity. The exact specimen pictured is the one you will receive, with a 1 cm scale cube shown to provide accurate measurement reference.

Geological Context and Age

This ammonite originates from the Lower Cenomanian, which dates between 100.5 and 98 million years ago. The Cenomanian stage marks the beginning of the Late Cretaceous and is known for global sea-level rises that created widespread shallow epicontinental seas across Europe. The Montpelier de Médillan locality in southwestern France is highly regarded for its fossiliferous marine deposits, where limestone and chalk layers preserve abundant ammonites, bivalves, and other marine fauna. These rocks not only provide excellent material for collectors but also serve as key reference points in paleontological research.

Species and Classification

Acanthoceras pseudorenevieri belongs to the order Ammonitida, superfamily Acanthoceratoidea, and family Acanthoceratidae. The genus Acanthoceras is characterised by its strong ribbing, nodose ornamentation, and moderately evolute shells. This particular species, pseudorenevieri, is recognised for its distinctive rib structure and nodal features, which are useful in biostratigraphy for defining Lower Cenomanian ammonite zones. These traits make it an important fossil both scientifically and as part of private collections.

Morphology and Key Features

This specimen shows the robust ornamentation typical of Acanthoceras pseudorenevieri. Its shell is strongly ribbed, with ribs radiating across the flanks and terminating in pronounced tubercles along the ventrolateral margins. The whorls display a sturdy, well-defined structure, reflecting adaptations for both shell strength and hydrodynamic efficiency. Such features not only served an evolutionary purpose but also give the fossil an aesthetically striking appearance, making it a highly desirable specimen for collectors of Cretaceous ammonites.

Depositional Environment and Paleoecology

During the Cenomanian, the Montpelier de Médillan region was submerged beneath a warm shallow sea. These marine conditions were ideal for ammonites, which flourished in vast numbers. As a nektonic cephalopod, Acanthoceras pseudorenevieri would have been an active swimmer, preying upon small marine organisms such as crustaceans and juvenile mollusks. Its abundance and widespread distribution have made it an essential fossil for reconstructing Cenomanian marine ecosystems and understanding evolutionary developments in mid-Cretaceous ammonites.

Collector’s Value and Authenticity

This ammonite fossil is both scientifically valuable and visually appealing. Its ribbing, tubercles, and overall preservation highlight the species’ distinctive morphology. Each fossil we sell is carefully photographed so that you receive the exact specimen pictured. The 1 cm scale cube included in the images allows accurate size assessment, and the fossil comes with a Certificate of Authenticity guaranteeing it as a genuine natural specimen.

Owning this Acanthoceras pseudorenevieri ammonite fossil offers a rare opportunity to hold a 98-million-year-old relic of the Cretaceous seas of France. It is a superb choice for fossil collectors, paleontology enthusiasts, educators, or as a striking display piece of natural history.