Acanthoceras rhotomagense Ammonite Fossil Cenomanian Cretaceous France Authentic Specimen COA
£ 14.40
ACANTHOCERAS RHOTOMAGENSE AMMONITE FOSSILThis listing offers a fine Acanthoceras rhotomagense Ammonite Fossil from the
Lower Cenomanian stage of the Late Cretaceous, collected in Sarthe, France. Dated to approximately 100–96 million years ago, this ammonite is one of the most iconic species of the Cenomanian, recognised across Europe for its diagnostic features. The exact specimen shown in the photographs will be sent, with a 1 cm scale cube provided for accurate measurement. All of our fossils are 100% genuine and come with a Certificate of Authenticity. GEOLOGICAL CONTEXT – LOWER CENOMANIAN OF SARTHEThis specimen originates from the Lower Cenomanian deposits of Sarthe, an important fossil-bearing region in northwestern France. During the Cenomanian stage, high global sea levels covered much of Europe with shallow seas connected to the Tethys and North Atlantic Oceans. These warm marine environments supported diverse marine life, including ammonites, belemnites, bivalves, echinoids, and abundant plankton.The Cenomanian is a critical stage in the geologic timescale, marking the beginning of the Late Cretaceous. Fossil-rich deposits from Sarthe and surrounding areas have been extensively studied and are key to refining ammonite biozones that allow precise stratigraphic correlation across Europe. SPECIES OVERVIEW – ACANTHOCERAS RHOTOMAGENSEThe specimen has been identified as Acanthoceras rhotomagense, a species belonging to the order Ammonitida, superfamily Acanthoceratoidea, and family Acanthoceratidae. This ammonite is instantly recognisable for its robust, evolute shell with strong, straight ribs and prominent tubercles located along the ventrolateral shoulders.The shell ornamentation of Acanthoceras rhotomagense is particularly bold, with ribs often bifurcating and ending in well-developed nodes. These features gave the ammonite structural strength while also serving as important diagnostic traits. Its morphology reflects adaptations to active swimming in open water, where it would have been a nektonic predator feeding on smaller marine invertebrates. PALEONTOLOGICAL IMPORTANCEAcanthoceras rhotomagense is one of the most important index fossils for the Lower Cenomanian. Its distinctive morphology and well-constrained stratigraphic distribution make it a key marker species for defining the Acanthoceras rhotomagense Biozone. This biozone is used internationally to date and correlate Cenomanian strata, providing a reference point in the global geologic timescale.The species also represents a significant evolutionary stage within the Acanthoceratidae, a family that achieved great diversity during the Cretaceous. Its highly ornamented shell is an excellent example of the adaptive experimentation seen in ammonites during this time. COLLECTOR’S AND EDUCATIONAL VALUEThis Acanthoceras rhotomagense ammonite fossil is highly desirable for collectors of Cretaceous ammonites, especially those focusing on European or French specimens. Its provenance from Sarthe, France, enhances its significance, as fossils from this region are central to Cenomanian stratigraphy. The strong ribbing and tuberculate ornamentation make it a visually impressive fossil, suitable for both scientific and display purposes.For educators and students, it serves as an excellent teaching specimen, illustrating ammonite morphology, Cretaceous paleoenvironments, and the principles of biostratigraphy. GUARANTEE OF AUTHENTICITY
• 100% genuine Acanthoceras rhotomagense ammonite fossil
• Supplied with a Certificate of Authenticity
• The exact specimen shown in the photographs will be sentThis is a rare opportunity to own a scientifically important and beautifully preserved Acanthoceras rhotomagense Ammonite Fossil from the Lower Cenomanian of Sarthe, France, an outstanding specimen of Europe’s Late Cretaceous seas.
Lower Cenomanian stage of the Late Cretaceous, collected in Sarthe, France. Dated to approximately 100–96 million years ago, this ammonite is one of the most iconic species of the Cenomanian, recognised across Europe for its diagnostic features. The exact specimen shown in the photographs will be sent, with a 1 cm scale cube provided for accurate measurement. All of our fossils are 100% genuine and come with a Certificate of Authenticity. GEOLOGICAL CONTEXT – LOWER CENOMANIAN OF SARTHEThis specimen originates from the Lower Cenomanian deposits of Sarthe, an important fossil-bearing region in northwestern France. During the Cenomanian stage, high global sea levels covered much of Europe with shallow seas connected to the Tethys and North Atlantic Oceans. These warm marine environments supported diverse marine life, including ammonites, belemnites, bivalves, echinoids, and abundant plankton.The Cenomanian is a critical stage in the geologic timescale, marking the beginning of the Late Cretaceous. Fossil-rich deposits from Sarthe and surrounding areas have been extensively studied and are key to refining ammonite biozones that allow precise stratigraphic correlation across Europe. SPECIES OVERVIEW – ACANTHOCERAS RHOTOMAGENSEThe specimen has been identified as Acanthoceras rhotomagense, a species belonging to the order Ammonitida, superfamily Acanthoceratoidea, and family Acanthoceratidae. This ammonite is instantly recognisable for its robust, evolute shell with strong, straight ribs and prominent tubercles located along the ventrolateral shoulders.The shell ornamentation of Acanthoceras rhotomagense is particularly bold, with ribs often bifurcating and ending in well-developed nodes. These features gave the ammonite structural strength while also serving as important diagnostic traits. Its morphology reflects adaptations to active swimming in open water, where it would have been a nektonic predator feeding on smaller marine invertebrates. PALEONTOLOGICAL IMPORTANCEAcanthoceras rhotomagense is one of the most important index fossils for the Lower Cenomanian. Its distinctive morphology and well-constrained stratigraphic distribution make it a key marker species for defining the Acanthoceras rhotomagense Biozone. This biozone is used internationally to date and correlate Cenomanian strata, providing a reference point in the global geologic timescale.The species also represents a significant evolutionary stage within the Acanthoceratidae, a family that achieved great diversity during the Cretaceous. Its highly ornamented shell is an excellent example of the adaptive experimentation seen in ammonites during this time. COLLECTOR’S AND EDUCATIONAL VALUEThis Acanthoceras rhotomagense ammonite fossil is highly desirable for collectors of Cretaceous ammonites, especially those focusing on European or French specimens. Its provenance from Sarthe, France, enhances its significance, as fossils from this region are central to Cenomanian stratigraphy. The strong ribbing and tuberculate ornamentation make it a visually impressive fossil, suitable for both scientific and display purposes.For educators and students, it serves as an excellent teaching specimen, illustrating ammonite morphology, Cretaceous paleoenvironments, and the principles of biostratigraphy. GUARANTEE OF AUTHENTICITY
• 100% genuine Acanthoceras rhotomagense ammonite fossil
• Supplied with a Certificate of Authenticity
• The exact specimen shown in the photographs will be sentThis is a rare opportunity to own a scientifically important and beautifully preserved Acanthoceras rhotomagense Ammonite Fossil from the Lower Cenomanian of Sarthe, France, an outstanding specimen of Europe’s Late Cretaceous seas.
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