Graphoceras castum Ammonite Fossil Bajocian Dorset UK Inferior Oolite Formation Jurassic Specimen with Certificate
£ 24.00
GENUINE GRAPHOCERAS CASTUM AMMONITE FOSSILThis is a genuine Graphoceras castum ammonite fossil from the Inferior Oolite
Formation, Middle Jurassic, Bajocian Stage, Concavum Zone, collected from Beaminster, Dorset, UK. This carefully chosen fossil is an appealing specimen for collectors of British ammonites, Jurassic fossils, cephalopods, natural history items, and scientifically interesting display pieces.The photograph shows the actual fossil you will receive, allowing you to view the individual preservation, surface detail, fossil shape, matrix, colour, and natural character of this specimen before purchase. Full sizing details can be seen in the photo. This fossil also includes a Certificate of Authenticity lifetime guarantee generic card, confirming it as a genuine specimen. FOSSIL TYPE, SPECIES AND SCIENTIFIC CLASSIFICATIONGraphoceras castum is an ammonite, an extinct marine cephalopod related to modern squid, cuttlefish, octopus, and nautilus. Ammonites are among the most iconic fossils of the Jurassic Period, recognised for their coiled shells, varied ornamentation, and important use in dating sedimentary rocks.This fossil belongs to the genus Graphoceras and the species Graphoceras castum. Members of Graphoceras are associated with the family Graphoceratidae, within the order Ammonitida. Graphoceratid ammonites are especially significant in Middle Jurassic biostratigraphy, as their evolving shell forms and wide distribution make them valuable fossils for identifying and comparing rock layers.The specimen comes from the Concavum Zone, an important ammonite biozone around the Aalenian to Bajocian interval of the Middle Jurassic. Ammonite zones are used by geologists and palaeontologists to divide geological time into precise fossil-based intervals, making named species such as Graphoceras castum especially interesting for collectors who value both appearance and scientific context. GEOLOGICAL AGE, FORMATION AND LOCALITYThis fossil is from the Inferior Oolite Formation of Beaminster, Dorset, UK. The Inferior Oolite is a classic British Jurassic rock unit, well known for its marine fossils, including ammonites, bivalves, brachiopods, gastropods, echinoids, and other remains of ancient sea life. The Middle Jurassic Bajocian Stage dates to approximately 170 to 168 million years ago.During the Bajocian, southern Britain was covered by warm, shallow epicontinental seas. These marine environments supported a rich variety of invertebrate life, while ammonites moved through the water column as active predatory or scavenging cephalopods. After death, ammonite shells could settle onto the sea floor, become buried by sediment, and later fossilise through mineral replacement, compaction, and preservation within limestone-rich deposits.Beaminster and the wider Dorset region are important for British Jurassic palaeontology, with fossil-bearing strata that form part of the broader geological story of southern England’s ancient marine environments. AMMONITE MORPHOLOGY AND NATURAL FEATURESGraphoceras castum shows the classic planispiral ammonite shell form, with the shell coiled in a flat spiral. Depending on preservation, the fossil may display whorl shape, ribbing, shell curvature, compressed form, natural mineral staining, matrix attachment, and surface ornamentation. The whorls represent the growth stages of the animal, with the shell expanding outward as the ammonite matured.Graphoceratid ammonites are often admired for their elegant coiling and scientifically useful shell features. Natural surface textures, weathering, small fractures, sedimentary contact marks, and mineral colour variations are part of the fossil’s geological history and add authenticity and character to the specimen. COLLECTING, DISPLAY AND EDUCATIONAL INTERESTThis Graphoceras castum ammonite is well suited for display in a fossil cabinet, study, classroom, office, natural history collection, or Jurassic fossil arrangement. Its named species, British locality, Inferior Oolite Formation origin, and Concavum Zone association give it strong collecting appeal.It is a suitable fossil for anyone interested in ammonites, Dorset fossils, British geology, Jurassic marine life, index fossils, or educational specimens. The combination of attractive natural form and precise geological information makes this a meaningful piece for both beginner and experienced fossil collectors. AUTHENTICITY AND SPECIMEN DETAILSThis is a genuine Graphoceras castum ammonite fossil from the Inferior Oolite Formation, Middle Jurassic, Bajocian Stage, Concavum Zone, Beaminster, Dorset, UK. 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.
Formation, Middle Jurassic, Bajocian Stage, Concavum Zone, collected from Beaminster, Dorset, UK. This carefully chosen fossil is an appealing specimen for collectors of British ammonites, Jurassic fossils, cephalopods, natural history items, and scientifically interesting display pieces.The photograph shows the actual fossil you will receive, allowing you to view the individual preservation, surface detail, fossil shape, matrix, colour, and natural character of this specimen before purchase. Full sizing details can be seen in the photo. This fossil also includes a Certificate of Authenticity lifetime guarantee generic card, confirming it as a genuine specimen. FOSSIL TYPE, SPECIES AND SCIENTIFIC CLASSIFICATIONGraphoceras castum is an ammonite, an extinct marine cephalopod related to modern squid, cuttlefish, octopus, and nautilus. Ammonites are among the most iconic fossils of the Jurassic Period, recognised for their coiled shells, varied ornamentation, and important use in dating sedimentary rocks.This fossil belongs to the genus Graphoceras and the species Graphoceras castum. Members of Graphoceras are associated with the family Graphoceratidae, within the order Ammonitida. Graphoceratid ammonites are especially significant in Middle Jurassic biostratigraphy, as their evolving shell forms and wide distribution make them valuable fossils for identifying and comparing rock layers.The specimen comes from the Concavum Zone, an important ammonite biozone around the Aalenian to Bajocian interval of the Middle Jurassic. Ammonite zones are used by geologists and palaeontologists to divide geological time into precise fossil-based intervals, making named species such as Graphoceras castum especially interesting for collectors who value both appearance and scientific context. GEOLOGICAL AGE, FORMATION AND LOCALITYThis fossil is from the Inferior Oolite Formation of Beaminster, Dorset, UK. The Inferior Oolite is a classic British Jurassic rock unit, well known for its marine fossils, including ammonites, bivalves, brachiopods, gastropods, echinoids, and other remains of ancient sea life. The Middle Jurassic Bajocian Stage dates to approximately 170 to 168 million years ago.During the Bajocian, southern Britain was covered by warm, shallow epicontinental seas. These marine environments supported a rich variety of invertebrate life, while ammonites moved through the water column as active predatory or scavenging cephalopods. After death, ammonite shells could settle onto the sea floor, become buried by sediment, and later fossilise through mineral replacement, compaction, and preservation within limestone-rich deposits.Beaminster and the wider Dorset region are important for British Jurassic palaeontology, with fossil-bearing strata that form part of the broader geological story of southern England’s ancient marine environments. AMMONITE MORPHOLOGY AND NATURAL FEATURESGraphoceras castum shows the classic planispiral ammonite shell form, with the shell coiled in a flat spiral. Depending on preservation, the fossil may display whorl shape, ribbing, shell curvature, compressed form, natural mineral staining, matrix attachment, and surface ornamentation. The whorls represent the growth stages of the animal, with the shell expanding outward as the ammonite matured.Graphoceratid ammonites are often admired for their elegant coiling and scientifically useful shell features. Natural surface textures, weathering, small fractures, sedimentary contact marks, and mineral colour variations are part of the fossil’s geological history and add authenticity and character to the specimen. COLLECTING, DISPLAY AND EDUCATIONAL INTERESTThis Graphoceras castum ammonite is well suited for display in a fossil cabinet, study, classroom, office, natural history collection, or Jurassic fossil arrangement. Its named species, British locality, Inferior Oolite Formation origin, and Concavum Zone association give it strong collecting appeal.It is a suitable fossil for anyone interested in ammonites, Dorset fossils, British geology, Jurassic marine life, index fossils, or educational specimens. The combination of attractive natural form and precise geological information makes this a meaningful piece for both beginner and experienced fossil collectors. AUTHENTICITY AND SPECIMEN DETAILSThis is a genuine Graphoceras castum ammonite fossil from the Inferior Oolite Formation, Middle Jurassic, Bajocian Stage, Concavum Zone, Beaminster, Dorset, UK. 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.
