Rare Stephanoceras Rosbriumnense Ammonite Fossil Jurassic Dorset UK Specimen Inferior Oolite Bajocian Oborne Wood Quarry with COA
£ 120.00
RARE STEPHANOCERAS ROSBRIUMNENSE AMMONITE FROM OBORNE WOOD QUARRYThis rare Stephanoceras rosbriumnense ammonite fossil comes from the Inferior
Oolite Formation at Oborne Wood Quarry, Dorset, UK. Dating from the Middle Jurassic, Bajocian stage, Romani Subzone, this carefully chosen specimen is a highly collectible British ammonite with strong geological, scientific, and display appeal. Fossils with a named species, precise formation, geological stage, subzone, and quarry locality are especially desirable for collectors who value detailed provenance and meaningful palaeontological context.The photograph shows the actual fossil specimen you will receive, allowing you to view the real preservation, shell form, surface detail, colour, matrix, and natural character before purchase. Full sizing can be seen in the photo, making it easy to assess scale and suitability for a fossil cabinet, collector’s tray, desk display, educational collection, or natural history gift. FOSSIL TYPE, SPECIES AND CLASSIFICATIONStephanoceras rosbriumnense is an extinct ammonite species belonging to the wider group of coiled marine cephalopod molluscs known as ammonites. Ammonites lived in prehistoric seas and are related to modern squid, cuttlefish, octopus, and nautilus, although the ammonite lineage itself became extinct at the end of the Cretaceous Period.Stephanoceras is generally placed within the order Ammonitida, superfamily Stephanoceratoidea, and family Stephanoceratidae. This family includes many classic Middle Jurassic ammonites recognised for their robust coiling, rounded whorls, strong ribbing, and ornamental shell sculpture. A rare named species such as Stephanoceras rosbriumnense gives this fossil a stronger scientific identity than a general ammonite specimen and makes it particularly appealing to collectors of British Jurassic cephalopods. MORPHOLOGY AND NATURAL FEATURESStephanoceras ammonites are known for their bold, sculptural shell form. They commonly display a planispiral coil, meaning the shell coils in a single flat plane, with rounded to inflated whorls and distinctive ribbing. Many stephanoceratid ammonites show strong primary ribs, branching secondary ribs, and raised nodes or tubercles depending on preservation, shell position, and growth stage.Like other ammonites, Stephanoceras had an internally chambered shell. The living animal occupied the outer body chamber, while the earlier chambers assisted with buoyancy control as the animal moved through the Jurassic sea. The whorl shape, rib spacing, tuberculation, and overall coiling pattern are all important features used in ammonite identification.Natural features may include visible whorl structure, mineralised shell surface, matrix attachment, sediment staining, worn high points, partial preservation, or small irregularities from fossilisation. These characteristics are part of the fossil’s authentic geological history and give the specimen its own individual display character. GEOLOGICAL AGE, ZONE AND SUBZONEThis fossil dates from the Bajocian stage of the Middle Jurassic and is associated with the Romani Subzone. The Bajocian was an important interval in ammonite evolution, with many distinctive ammonite groups developing rapidly in shallow marine environments. Because ammonites evolved quickly and were widely distributed, they are among the most useful fossils for dating and correlating Jurassic rock layers.The Romani Subzone gives this specimen a refined stratigraphic context, making it especially appealing for collectors interested in ammonite succession, fossil zones, and precise geological placement. Subzone information adds scientific value by linking the fossil to a more specific interval within the Middle Jurassic record. INFERIOR OOLITE FORMATION AND DORSET LOCALITYThe Inferior Oolite Formation is a famous British Jurassic rock unit known for fossil-rich limestones and oolitic sediments. Oolitic limestone forms from tiny rounded carbonate grains called ooids, which developed in warm, shallow marine waters where currents moved carbonate sediment across the sea floor.During the Bajocian, the area now forming Dorset was covered by a shallow Jurassic sea. This marine environment supported ammonites, belemnites, bivalves, brachiopods, gastropods, echinoids, fish, and many other organisms. After death, shells and hard parts could become buried in carbonate-rich sediment and preserved over millions of years.Oborne Wood Quarry is a named Dorset locality, adding strong provenance and collector appeal. A Stephanoceras rosbriumnense ammonite from this setting represents a direct connection to the ancient marine environments preserved within the Inferior Oolite of southern England. GENUINE SPECIMEN WITH CERTIFICATE OF AUTHENTICITYThis Stephanoceras rosbriumnense ammonite fossil is a genuine specimen and includes a Certificate of Authenticity lifetime guarantee generic card. The certificate provides added confidence for fossil collectors, schools, gift buyers, and anyone building a verified 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 detail, matrix, colour, shape, and individual character. COLLECTING, DISPLAY AND EDUCATIONAL APPEALA rare Stephanoceras rosbriumnense ammonite from the Inferior Oolite Formation is an excellent addition to a British Jurassic fossil collection. It pairs well with other Middle Jurassic ammonites, belemnites, brachiopods, bivalves, gastropods, echinoids, and marine fossils from Dorset and Somerset.With its rare named species identification, Bajocian age, Romani Subzone, Oborne Wood Quarry provenance, Inferior Oolite Formation origin, and included Certificate of Authenticity, this fossil offers strong collecting, educational, and decorative appeal.
Oolite Formation at Oborne Wood Quarry, Dorset, UK. Dating from the Middle Jurassic, Bajocian stage, Romani Subzone, this carefully chosen specimen is a highly collectible British ammonite with strong geological, scientific, and display appeal. Fossils with a named species, precise formation, geological stage, subzone, and quarry locality are especially desirable for collectors who value detailed provenance and meaningful palaeontological context.The photograph shows the actual fossil specimen you will receive, allowing you to view the real preservation, shell form, surface detail, colour, matrix, and natural character before purchase. Full sizing can be seen in the photo, making it easy to assess scale and suitability for a fossil cabinet, collector’s tray, desk display, educational collection, or natural history gift. FOSSIL TYPE, SPECIES AND CLASSIFICATIONStephanoceras rosbriumnense is an extinct ammonite species belonging to the wider group of coiled marine cephalopod molluscs known as ammonites. Ammonites lived in prehistoric seas and are related to modern squid, cuttlefish, octopus, and nautilus, although the ammonite lineage itself became extinct at the end of the Cretaceous Period.Stephanoceras is generally placed within the order Ammonitida, superfamily Stephanoceratoidea, and family Stephanoceratidae. This family includes many classic Middle Jurassic ammonites recognised for their robust coiling, rounded whorls, strong ribbing, and ornamental shell sculpture. A rare named species such as Stephanoceras rosbriumnense gives this fossil a stronger scientific identity than a general ammonite specimen and makes it particularly appealing to collectors of British Jurassic cephalopods. MORPHOLOGY AND NATURAL FEATURESStephanoceras ammonites are known for their bold, sculptural shell form. They commonly display a planispiral coil, meaning the shell coils in a single flat plane, with rounded to inflated whorls and distinctive ribbing. Many stephanoceratid ammonites show strong primary ribs, branching secondary ribs, and raised nodes or tubercles depending on preservation, shell position, and growth stage.Like other ammonites, Stephanoceras had an internally chambered shell. The living animal occupied the outer body chamber, while the earlier chambers assisted with buoyancy control as the animal moved through the Jurassic sea. The whorl shape, rib spacing, tuberculation, and overall coiling pattern are all important features used in ammonite identification.Natural features may include visible whorl structure, mineralised shell surface, matrix attachment, sediment staining, worn high points, partial preservation, or small irregularities from fossilisation. These characteristics are part of the fossil’s authentic geological history and give the specimen its own individual display character. GEOLOGICAL AGE, ZONE AND SUBZONEThis fossil dates from the Bajocian stage of the Middle Jurassic and is associated with the Romani Subzone. The Bajocian was an important interval in ammonite evolution, with many distinctive ammonite groups developing rapidly in shallow marine environments. Because ammonites evolved quickly and were widely distributed, they are among the most useful fossils for dating and correlating Jurassic rock layers.The Romani Subzone gives this specimen a refined stratigraphic context, making it especially appealing for collectors interested in ammonite succession, fossil zones, and precise geological placement. Subzone information adds scientific value by linking the fossil to a more specific interval within the Middle Jurassic record. INFERIOR OOLITE FORMATION AND DORSET LOCALITYThe Inferior Oolite Formation is a famous British Jurassic rock unit known for fossil-rich limestones and oolitic sediments. Oolitic limestone forms from tiny rounded carbonate grains called ooids, which developed in warm, shallow marine waters where currents moved carbonate sediment across the sea floor.During the Bajocian, the area now forming Dorset was covered by a shallow Jurassic sea. This marine environment supported ammonites, belemnites, bivalves, brachiopods, gastropods, echinoids, fish, and many other organisms. After death, shells and hard parts could become buried in carbonate-rich sediment and preserved over millions of years.Oborne Wood Quarry is a named Dorset locality, adding strong provenance and collector appeal. A Stephanoceras rosbriumnense ammonite from this setting represents a direct connection to the ancient marine environments preserved within the Inferior Oolite of southern England. GENUINE SPECIMEN WITH CERTIFICATE OF AUTHENTICITYThis Stephanoceras rosbriumnense ammonite fossil is a genuine specimen and includes a Certificate of Authenticity lifetime guarantee generic card. The certificate provides added confidence for fossil collectors, schools, gift buyers, and anyone building a verified 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 detail, matrix, colour, shape, and individual character. COLLECTING, DISPLAY AND EDUCATIONAL APPEALA rare Stephanoceras rosbriumnense ammonite from the Inferior Oolite Formation is an excellent addition to a British Jurassic fossil collection. It pairs well with other Middle Jurassic ammonites, belemnites, brachiopods, bivalves, gastropods, echinoids, and marine fossils from Dorset and Somerset.With its rare named species identification, Bajocian age, Romani Subzone, Oborne Wood Quarry provenance, Inferior Oolite Formation origin, and included Certificate of Authenticity, this fossil offers strong collecting, educational, and decorative appeal.
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