Spathiceras subconcilliatum Ammonite Fossil Cretaceous Lower Cenomanian France Genuine Specimen with COA

Description

Spathiceras (Jeanrogericeras) subconcilliatum Ammonite from Thorne, France

This superb ammonite fossil represents Spathiceras (Jeanrogericeras) subconcilliatum, a striking and scientifically important species from the Lower Cenomanian stage of the Cretaceous. Discovered in the renowned fossil beds of Thorne, France, this specimen displays the distinctive features of its genus and subgenus, making it a highly desirable fossil for collectors and researchers alike. Every fossil we offer is 100% genuine and comes with a Certificate of Authenticity. The specimen photographed is the exact one you will receive, and a 1 cm scale cube has been included to provide accurate size reference.

Geological Context and Age

This ammonite originates from the Lower Cenomanian, an interval dating from approximately 100.5 to 98 million years ago. The Cenomanian represents the start of the Late Cretaceous, a time of rising sea levels and extensive marine transgressions that created shallow epicontinental seas across Europe. The Thorne area of France is well known for its fossiliferous deposits from this stage, which have yielded exceptionally preserved ammonites, bivalves, gastropods, and other marine fauna. Fossils from this locality are highly prized for their quality and importance in paleontological research.

Taxonomy and Classification

Spathiceras (Jeanrogericeras) subconcilliatum belongs to the order Ammonitida, within the superfamily Stephanoceratoidea. The genus Spathiceras is notable for its wide distribution and distinctive morphological traits, while the subgenus Jeanrogericeras further refines its classification, allowing paleontologists to identify biozones and establish correlations between Lower Cenomanian deposits. This makes the species scientifically valuable as both a biostratigraphic marker and a representative example of Cretaceous ammonite diversity.

Morphology and Key Features

This fossil exhibits the classic characteristics of Spathiceras (Jeanrogericeras) subconcilliatum. The shell shows moderately involute coiling, strong ribbing across the flanks, and distinctive whorl proportions. The ribs are regularly spaced and may bifurcate, creating a bold ornamentation pattern that enhances the fossil’s visual appeal. These morphological adaptations were likely beneficial for shell strength and hydrodynamic efficiency as the ammonite navigated its marine environment. The elegant structure and pronounced ribbing of this specimen make it a textbook example of the species.

Depositional Environment and Paleoecology

During the Cenomanian, the Thorne region was submerged beneath a warm shallow sea, part of the vast epicontinental seas that dominated Europe at the time. These environments provided ideal conditions for ammonites, which thrived in large numbers and high diversity. As a nektonic cephalopod, Spathiceras (Jeanrogericeras) subconcilliatum would have been an active swimmer, preying on small crustaceans and other invertebrates in the open water column. Its presence in fossil assemblages contributes to our understanding of marine ecosystems during the Cretaceous greenhouse world.

Collector’s Significance and Authenticity

This ammonite fossil is not only scientifically valuable but also visually impressive, with its bold ribbing and distinct coiling pattern clearly preserved. It is an ideal specimen for display, educational study, or as part of a wider fossil collection. Each piece we sell is carefully photographed so that buyers can be assured they will receive exactly the specimen shown. The included Certificate of Authenticity confirms it as a genuine fossil, not a replica.

Owning this Spathiceras (Jeanrogericeras) subconcilliatum ammonite provides a rare opportunity to hold in your hands a 100-million-year-old relic of the Cretaceous seas. It is a timeless piece of natural history from the world-famous Cenomanian deposits of Thorne, France.