Graphoceras Concavum Ammonite Fossil Jurassic Dorset UK West Bay Bridport Specimen Aalenian Bridport Sand Formation with COA
£ 48.00
GENUINE GRAPHOCERAS CONCAVUM AMMONITE FROM WEST BAY, DORSETThis genuine Graphoceras concavum ammonite fossil comes from the Bridport Sand
Formation at West Bay, Bridport, Dorset, UK. Dating from the Middle Jurassic, Aalenian stage, this carefully chosen fossil is an attractive British ammonite specimen from one of the most famous fossil-bearing coastlines in southern England. West Bay and Bridport are well known among fossil collectors for Jurassic marine fossils preserved in sandy and calcareous sedimentary rocks, making this a desirable locality piece for any fossil or natural history collection.The photograph shows the actual fossil specimen you will receive, allowing you to view the real preservation, shell form, surface detail, matrix, colour, and natural character before purchase. Full sizing can be seen in the photo, making it easy to assess scale and display suitability for a fossil cabinet, collector’s tray, desk display, educational collection, or geology-themed gift. FOSSIL TYPE, SPECIES AND CLASSIFICATIONGraphoceras concavum is an extinct ammonite species belonging to the wider group of coiled cephalopod molluscs known as ammonites. Ammonites were marine animals related to modern squid, cuttlefish, octopus, and nautilus, although ammonites themselves became extinct at the end of the Cretaceous Period.Graphoceras is an important Jurassic ammonite genus and is commonly associated with the family Graphoceratidae. Ammonites such as Graphoceras are especially valued because they are useful for biostratigraphy, helping geologists and palaeontologists date and compare rock layers. Graphoceras concavum is particularly significant because it is linked with the Concavum Zone of the Aalenian, giving this specimen additional geological interest beyond its visual appeal. MORPHOLOGY AND NATURAL FEATURESGraphoceras ammonites typically display a coiled, planispiral shell with a compressed whorl profile and an elegant, rounded to keeled outer edge depending on preservation and growth stage. The shell may show curved ribbing, fine growth lines, a defined spiral form, and subtle ornamentation that reflects the original shell structure.The species name concavum refers to the distinctive form recognised in this ammonite group. In well-preserved examples, collectors may observe a neat whorl arrangement, gently arched ribs, and an overall refined shell shape compared with more heavily ribbed Jurassic ammonites. As with all ammonites, the shell would originally have been internally chambered, with the living animal occupying the outer body chamber while earlier chambers assisted with buoyancy control in the Jurassic sea.Natural features may include mineralised shell surface, exposed whorl detail, sediment staining, matrix attachment, small irregularities, natural wear, or partial preservation. These characteristics are part of the fossil’s geological history and give each specimen its own individual character. GEOLOGICAL AGE AND AALENIAN SETTINGThis fossil dates from the Aalenian stage of the Middle Jurassic. The Aalenian marks an important interval between the Early and Middle Jurassic, during which ammonite faunas developed rapidly and became highly useful for dating marine sediments. The association with Graphoceras concavum places the fossil within a scientifically recognised ammonite framework, making it especially appealing for collectors interested in named species and stratigraphic context.During the Aalenian, the area now known as Dorset formed part of a shallow marine environment. Ammonites, belemnites, bivalves, gastropods, brachiopods, fish, and other marine organisms lived in these waters, while sediment accumulated on the sea floor and later hardened into fossil-bearing rock. BRIDPORT SAND FORMATION AND WEST BAY LOCALITYThe Bridport Sand Formation is a well-known Jurassic rock unit exposed around the Dorset coast. It is composed largely of fine-grained sands and sandy limestones, reflecting deposition in a shallow marine shelf environment. These sediments preserve a variety of fossils and provide a valuable record of changing Jurassic seas in southern Britain.West Bay, near Bridport, is a classic fossil locality within the wider Jurassic Coast region. Fossils from this area are popular with collectors because they combine attractive preservation, strong locality data, and clear geological context. A Graphoceras concavum ammonite from this setting represents a direct link to the ancient marine ecosystems that once covered Dorset during the Jurassic Period. GENUINE SPECIMEN WITH CERTIFICATE OF AUTHENTICITYThis Graphoceras concavum ammonite fossil is a genuine specimen and includes a Certificate of Authenticity lifetime guarantee generic card. The certificate provides added confidence for collectors, schools, gift buyers, and anyone building a verified fossil or natural history collection.The fossil shown in the photograph is the actual specimen supplied. This means the piece you see is the piece you will receive, complete with its own natural preservation, shell form, matrix, surface detail, colour variation, and display character. COLLECTING, DISPLAY AND EDUCATIONAL APPEALA Graphoceras concavum ammonite from the Bridport Sand Formation is an excellent addition to a British Jurassic fossil collection. It pairs well with other ammonites, belemnites, fossil shells, bivalves, brachiopods, gastropods, and marine fossils from Dorset and Somerset.With its named species identification, Aalenian age, Middle Jurassic geology, Concavum Zone association, West Bay locality, and included Certificate of Authenticity, this fossil offers strong collecting, educational, and decorative appeal.
Formation at West Bay, Bridport, Dorset, UK. Dating from the Middle Jurassic, Aalenian stage, this carefully chosen fossil is an attractive British ammonite specimen from one of the most famous fossil-bearing coastlines in southern England. West Bay and Bridport are well known among fossil collectors for Jurassic marine fossils preserved in sandy and calcareous sedimentary rocks, making this a desirable locality piece for any fossil or natural history collection.The photograph shows the actual fossil specimen you will receive, allowing you to view the real preservation, shell form, surface detail, matrix, colour, and natural character before purchase. Full sizing can be seen in the photo, making it easy to assess scale and display suitability for a fossil cabinet, collector’s tray, desk display, educational collection, or geology-themed gift. FOSSIL TYPE, SPECIES AND CLASSIFICATIONGraphoceras concavum is an extinct ammonite species belonging to the wider group of coiled cephalopod molluscs known as ammonites. Ammonites were marine animals related to modern squid, cuttlefish, octopus, and nautilus, although ammonites themselves became extinct at the end of the Cretaceous Period.Graphoceras is an important Jurassic ammonite genus and is commonly associated with the family Graphoceratidae. Ammonites such as Graphoceras are especially valued because they are useful for biostratigraphy, helping geologists and palaeontologists date and compare rock layers. Graphoceras concavum is particularly significant because it is linked with the Concavum Zone of the Aalenian, giving this specimen additional geological interest beyond its visual appeal. MORPHOLOGY AND NATURAL FEATURESGraphoceras ammonites typically display a coiled, planispiral shell with a compressed whorl profile and an elegant, rounded to keeled outer edge depending on preservation and growth stage. The shell may show curved ribbing, fine growth lines, a defined spiral form, and subtle ornamentation that reflects the original shell structure.The species name concavum refers to the distinctive form recognised in this ammonite group. In well-preserved examples, collectors may observe a neat whorl arrangement, gently arched ribs, and an overall refined shell shape compared with more heavily ribbed Jurassic ammonites. As with all ammonites, the shell would originally have been internally chambered, with the living animal occupying the outer body chamber while earlier chambers assisted with buoyancy control in the Jurassic sea.Natural features may include mineralised shell surface, exposed whorl detail, sediment staining, matrix attachment, small irregularities, natural wear, or partial preservation. These characteristics are part of the fossil’s geological history and give each specimen its own individual character. GEOLOGICAL AGE AND AALENIAN SETTINGThis fossil dates from the Aalenian stage of the Middle Jurassic. The Aalenian marks an important interval between the Early and Middle Jurassic, during which ammonite faunas developed rapidly and became highly useful for dating marine sediments. The association with Graphoceras concavum places the fossil within a scientifically recognised ammonite framework, making it especially appealing for collectors interested in named species and stratigraphic context.During the Aalenian, the area now known as Dorset formed part of a shallow marine environment. Ammonites, belemnites, bivalves, gastropods, brachiopods, fish, and other marine organisms lived in these waters, while sediment accumulated on the sea floor and later hardened into fossil-bearing rock. BRIDPORT SAND FORMATION AND WEST BAY LOCALITYThe Bridport Sand Formation is a well-known Jurassic rock unit exposed around the Dorset coast. It is composed largely of fine-grained sands and sandy limestones, reflecting deposition in a shallow marine shelf environment. These sediments preserve a variety of fossils and provide a valuable record of changing Jurassic seas in southern Britain.West Bay, near Bridport, is a classic fossil locality within the wider Jurassic Coast region. Fossils from this area are popular with collectors because they combine attractive preservation, strong locality data, and clear geological context. A Graphoceras concavum ammonite from this setting represents a direct link to the ancient marine ecosystems that once covered Dorset during the Jurassic Period. GENUINE SPECIMEN WITH CERTIFICATE OF AUTHENTICITYThis Graphoceras concavum ammonite fossil is a genuine specimen and includes a Certificate of Authenticity lifetime guarantee generic card. The certificate provides added confidence for collectors, schools, gift buyers, and anyone building a verified fossil or natural history collection.The fossil shown in the photograph is the actual specimen supplied. This means the piece you see is the piece you will receive, complete with its own natural preservation, shell form, matrix, surface detail, colour variation, and display character. COLLECTING, DISPLAY AND EDUCATIONAL APPEALA Graphoceras concavum ammonite from the Bridport Sand Formation is an excellent addition to a British Jurassic fossil collection. It pairs well with other ammonites, belemnites, fossil shells, bivalves, brachiopods, gastropods, and marine fossils from Dorset and Somerset.With its named species identification, Aalenian age, Middle Jurassic geology, Concavum Zone association, West Bay locality, and included Certificate of Authenticity, this fossil offers strong collecting, educational, and decorative appeal.
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