Gregoryceras transversarium Ammonite Fossil Oxfordian France Genuine COA Jurassic Crussol Ardèche Specimen
£ 36.00
GENUINE GREGORYCERAS TRANSVERSARIUM AMMONITE FOSSILThis is a genuine Gregoryceras transversarium ammonite fossil from the Upper
Jurassic, Oxfordian Stage, collected from Crussol, Ardèche, Auvergne-Rhône-Alpes, France. This carefully chosen fossil specimen is an excellent piece for collectors of French ammonites, Upper Jurassic fossils, extinct marine cephalopods, natural history specimens, and scientifically labelled palaeontological display fossils.The photograph shows the actual fossil you will receive, allowing you to view the individual preservation, shell form, surface detail, colour, matrix, and natural character of this specific specimen before purchase. Full sizing details can be seen in the photo. This fossil includes a Certificate of Authenticity lifetime guarantee generic card, confirming it as a genuine specimen FOSSIL TYPE, SPECIES AND SCIENTIFIC CLASSIFICATIONGregoryceras transversarium is an ammonite, an extinct marine cephalopod belonging to the order Ammonitida. Ammonites were related to modern squid, cuttlefish, octopus, and nautilus, and are among the most recognisable fossils of the Jurassic Period. Their coiled shells, chambered internal structure, changing ornamentation, and rapid evolutionary development make them highly valued by collectors and important in palaeontology.This fossil belongs to the genus Gregoryceras and the species Gregoryceras transversarium. The genus is associated with Upper Jurassic ammonite faunas and is often linked with perisphinctid-style ammonites, a group commonly recognised for ribbed, evolute shell forms and strong biostratigraphic value. The species transversarium is especially notable because it is associated with the Transversarium Zone, an important ammonite biozone within the Oxfordian Stage. GEOLOGICAL AGE AND OXFORDIAN CONTEXTThis specimen dates from the Oxfordian Stage of the Upper Jurassic, approximately 164 to 157 million years ago. The Oxfordian was a time of widespread marine environments across parts of Europe, with ammonites forming a diverse and abundant part of ancient sea life. Their rapid evolution and wide distribution make many ammonite species important for comparing and dating Jurassic sedimentary rocks.During the Oxfordian, ammonites such as Gregoryceras transversarium lived as active swimming marine animals. Their shells were divided into internal chambers, with the living animal occupying the outer body chamber. These chambers helped regulate buoyancy in the water column, while the outer shell shape, ribbing, and whorl proportions are key features used in ammonite identification.After death, the shell could settle onto the sea floor and become buried by sediment. Over millions of years, mineralisation, compaction, and natural geological alteration preserved the shell form as a fossil. CRUSSOL, ARDÈCHE, FRANCE LOCALITYThis ammonite comes from Crussol in Ardèche, Auvergne-Rhône-Alpes, France, a locality known for Upper Jurassic sedimentary rocks and fossil-bearing marine deposits. French Jurassic ammonites are highly collectable because they represent classic European marine faunas and provide well-contextualised fossils from significant geological intervals.During the Upper Jurassic, the area that is now south-eastern France was influenced by marine conditions connected to broader European and Tethyan seas. Carbonate-rich sediments, limestones, marls, and sea-floor deposits helped preserve the remains of ammonites, belemnites, bivalves, brachiopods, gastropods, echinoids, and other marine invertebrates. These fossil-bearing deposits record a rich marine ecosystem from the ancient Jurassic seas of Europe. AMMONITE MORPHOLOGY AND NATURAL FEATURESGregoryceras transversarium displays the classic planispiral ammonite shell form, with the shell coiled in a flat spiral. The whorls represent successive growth stages as the ammonite matured. Ammonites of this type are often appreciated for their open coiling, visible umbilicus, ribbed shell ornamentation, and strong spiral outline.Depending on preservation, this fossil may show whorl shape, transverse ribbing, shell curvature, natural mineral staining, matrix attachment, surface wear, or fossilisation texture. The species name transversarium reflects the importance of transverse shell ornament and ribbing in recognising this ammonite form. The outer shell shape, rib pattern, whorl proportions, and umbilical structure all contribute to its scientific and display interest.Natural details such as small fractures, worn areas, sedimentary contact marks, colour variation, mineral deposits, and matrix are part of the fossil’s geological history. These features give the specimen individuality and help distinguish a genuine natural fossil from a modern cast or replica. COLLECTING, DISPLAY AND EDUCATIONAL INTERESTThis Gregoryceras transversarium ammonite fossil is well suited for display in a fossil cabinet, study, classroom, office, collection drawer, natural history arrangement, or Upper Jurassic fossil collection. Its named species identification, Oxfordian age, French origin, Crussol locality, and connection with the Transversarium Zone give it strong collecting and educational appeal.It is suitable for collectors interested in French fossils, Jurassic ammonites, extinct cephalopods, marine invertebrates, palaeontology, geology, ammonite biozones, and natural history display pieces. The natural coiled shell form gives the fossil immediate visual impact, while the species name and geological context make it a meaningful specimen from the ancient seas of Jurassic France. AUTHENTICITY AND SPECIMEN DETAILSThis is a genuine Gregoryceras transversarium ammonite fossil from the Upper Jurassic, Oxfordian Stage, Crussol, Ardèche, Auvergne-Rhône-Alpes, France. It includes a Certificate of Authenticity lifetime guarantee generic card. The photo shows the actual fossil you will receive, and full sizing information can be seen in the photo.
Jurassic, Oxfordian Stage, collected from Crussol, Ardèche, Auvergne-Rhône-Alpes, France. This carefully chosen fossil specimen is an excellent piece for collectors of French ammonites, Upper Jurassic fossils, extinct marine cephalopods, natural history specimens, and scientifically labelled palaeontological display fossils.The photograph shows the actual fossil you will receive, allowing you to view the individual preservation, shell form, surface detail, colour, matrix, and natural character of this specific specimen before purchase. Full sizing details can be seen in the photo. This fossil includes a Certificate of Authenticity lifetime guarantee generic card, confirming it as a genuine specimen FOSSIL TYPE, SPECIES AND SCIENTIFIC CLASSIFICATIONGregoryceras transversarium is an ammonite, an extinct marine cephalopod belonging to the order Ammonitida. Ammonites were related to modern squid, cuttlefish, octopus, and nautilus, and are among the most recognisable fossils of the Jurassic Period. Their coiled shells, chambered internal structure, changing ornamentation, and rapid evolutionary development make them highly valued by collectors and important in palaeontology.This fossil belongs to the genus Gregoryceras and the species Gregoryceras transversarium. The genus is associated with Upper Jurassic ammonite faunas and is often linked with perisphinctid-style ammonites, a group commonly recognised for ribbed, evolute shell forms and strong biostratigraphic value. The species transversarium is especially notable because it is associated with the Transversarium Zone, an important ammonite biozone within the Oxfordian Stage. GEOLOGICAL AGE AND OXFORDIAN CONTEXTThis specimen dates from the Oxfordian Stage of the Upper Jurassic, approximately 164 to 157 million years ago. The Oxfordian was a time of widespread marine environments across parts of Europe, with ammonites forming a diverse and abundant part of ancient sea life. Their rapid evolution and wide distribution make many ammonite species important for comparing and dating Jurassic sedimentary rocks.During the Oxfordian, ammonites such as Gregoryceras transversarium lived as active swimming marine animals. Their shells were divided into internal chambers, with the living animal occupying the outer body chamber. These chambers helped regulate buoyancy in the water column, while the outer shell shape, ribbing, and whorl proportions are key features used in ammonite identification.After death, the shell could settle onto the sea floor and become buried by sediment. Over millions of years, mineralisation, compaction, and natural geological alteration preserved the shell form as a fossil. CRUSSOL, ARDÈCHE, FRANCE LOCALITYThis ammonite comes from Crussol in Ardèche, Auvergne-Rhône-Alpes, France, a locality known for Upper Jurassic sedimentary rocks and fossil-bearing marine deposits. French Jurassic ammonites are highly collectable because they represent classic European marine faunas and provide well-contextualised fossils from significant geological intervals.During the Upper Jurassic, the area that is now south-eastern France was influenced by marine conditions connected to broader European and Tethyan seas. Carbonate-rich sediments, limestones, marls, and sea-floor deposits helped preserve the remains of ammonites, belemnites, bivalves, brachiopods, gastropods, echinoids, and other marine invertebrates. These fossil-bearing deposits record a rich marine ecosystem from the ancient Jurassic seas of Europe. AMMONITE MORPHOLOGY AND NATURAL FEATURESGregoryceras transversarium displays the classic planispiral ammonite shell form, with the shell coiled in a flat spiral. The whorls represent successive growth stages as the ammonite matured. Ammonites of this type are often appreciated for their open coiling, visible umbilicus, ribbed shell ornamentation, and strong spiral outline.Depending on preservation, this fossil may show whorl shape, transverse ribbing, shell curvature, natural mineral staining, matrix attachment, surface wear, or fossilisation texture. The species name transversarium reflects the importance of transverse shell ornament and ribbing in recognising this ammonite form. The outer shell shape, rib pattern, whorl proportions, and umbilical structure all contribute to its scientific and display interest.Natural details such as small fractures, worn areas, sedimentary contact marks, colour variation, mineral deposits, and matrix are part of the fossil’s geological history. These features give the specimen individuality and help distinguish a genuine natural fossil from a modern cast or replica. COLLECTING, DISPLAY AND EDUCATIONAL INTERESTThis Gregoryceras transversarium ammonite fossil is well suited for display in a fossil cabinet, study, classroom, office, collection drawer, natural history arrangement, or Upper Jurassic fossil collection. Its named species identification, Oxfordian age, French origin, Crussol locality, and connection with the Transversarium Zone give it strong collecting and educational appeal.It is suitable for collectors interested in French fossils, Jurassic ammonites, extinct cephalopods, marine invertebrates, palaeontology, geology, ammonite biozones, and natural history display pieces. The natural coiled shell form gives the fossil immediate visual impact, while the species name and geological context make it a meaningful specimen from the ancient seas of Jurassic France. AUTHENTICITY AND SPECIMEN DETAILSThis is a genuine Gregoryceras transversarium ammonite fossil from the Upper Jurassic, Oxfordian Stage, Crussol, Ardèche, Auvergne-Rhône-Alpes, France. It includes a Certificate of Authenticity lifetime guarantee generic card. The photo shows the actual fossil you will receive, and full sizing information can be seen in the photo.
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