Prorsiceras gregarium Ammonite Fossil Jurassic Oxfordshire UK Genuine Authentic COA
£ 36.00
AUTHENTIC JURASSIC FOSSIL FROM OXFORDSHIRE, UKThis fine Prorsiceras gregarium ammonite fossil is a genuine specimen from the
Upper Callovian stage of the Middle Jurassic, discovered in Oxfordshire, United Kingdom. It has been carefully selected for its distinctive features and scientific significance, making it an excellent addition for collectors and enthusiasts alike. The photographs show the actual specimen you will receive, with a 1 cm scale cube included for accurate sizing. Each fossil is supplied with a Certificate of Authenticity, guaranteeing that it is 100% genuine. GEOLOGICAL AGE AND PROVENANCEDating back approximately 164–163 million years, this ammonite originates from the Upper Callovian stage of the Jurassic Period. At this time, the Oxfordshire region was part of a shallow sea environment that stretched across much of Europe. The marine mudstones and clays deposited here created exceptional conditions for fossil preservation, particularly of ammonites. The Oxford Clay Formation is one of the most fossiliferous sequences in Britain, producing ammonites, marine reptiles, and invertebrates in remarkable detail. Fossils such as this one form an important part of the scientific record of Jurassic life. SPECIES IDENTIFICATION AND CLASSIFICATIONProrsiceras gregarium belongs to the class Cephalopoda, order Ammonitida, and superfamily Stephanoceratoidea. Ammonites of this genus are known for their distinctive ribbing and tightly coiled, planispiral shells. The species gregarium is a key ammonite within the Upper Callovian faunas of the Oxford Clay. Its presence in specific horizons makes it important in stratigraphy and paleontological studies, as it helps geologists identify biozones and correlate rock layers across different regions of Europe. MORPHOLOGY AND DISTINCTIVE TRAITSThis specimen displays the characteristic features of Prorsiceras gregarium, including well-defined ribs that extend symmetrically across the whorls. The shell is strongly coiled in a planispiral form, with compressed whorls and ornamentation typical of the genus. These features not only enhance the fossil’s visual appeal but also demonstrate adaptations that strengthened the shell and aided buoyancy control in Jurassic seas. The distinctive ribbing is particularly striking and makes this fossil easily identifiable within Callovian ammonite assemblages. SCIENTIFIC AND STRATIGRAPHIC IMPORTANCEProrsiceras gregarium is a significant index fossil for the Upper Callovian stage. Its presence in the Oxford Clay Formation contributes to the definition of ammonite biozones that geologists use to date and correlate Middle Jurassic strata. These fossils also provide insight into the evolutionary history of ammonites and the ecological dynamics of shallow marine environments. For collectors, Prorsiceras gregarium represents not only an attractive specimen but also an important piece of Earth’s geological timeline. CONDITION AND PRESENTATIONThe fossil has been professionally prepared to reveal its ribbing, whorl structure, and natural shell form. Its preservation is strong, with clear details that showcase the defining traits of this ammonite species. This is a one-of-a-kind specimen—not a reproduction or cast. The photographs provided show the exact fossil you will receive, ensuring complete confidence in your purchase. GUARANTEE OF AUTHENTICITYAll of our fossils are 100% genuine, responsibly sourced, and scientifically identified. Each specimen is supplied with a Certificate of Authenticity. This Prorsiceras gregarium ammonite fossil from Oxfordshire is a rare and scientifically valuable example of Jurassic marine life, making it an excellent addition for fossil collectors, natural history enthusiasts, and educational displays.
Upper Callovian stage of the Middle Jurassic, discovered in Oxfordshire, United Kingdom. It has been carefully selected for its distinctive features and scientific significance, making it an excellent addition for collectors and enthusiasts alike. The photographs show the actual specimen you will receive, with a 1 cm scale cube included for accurate sizing. Each fossil is supplied with a Certificate of Authenticity, guaranteeing that it is 100% genuine. GEOLOGICAL AGE AND PROVENANCEDating back approximately 164–163 million years, this ammonite originates from the Upper Callovian stage of the Jurassic Period. At this time, the Oxfordshire region was part of a shallow sea environment that stretched across much of Europe. The marine mudstones and clays deposited here created exceptional conditions for fossil preservation, particularly of ammonites. The Oxford Clay Formation is one of the most fossiliferous sequences in Britain, producing ammonites, marine reptiles, and invertebrates in remarkable detail. Fossils such as this one form an important part of the scientific record of Jurassic life. SPECIES IDENTIFICATION AND CLASSIFICATIONProrsiceras gregarium belongs to the class Cephalopoda, order Ammonitida, and superfamily Stephanoceratoidea. Ammonites of this genus are known for their distinctive ribbing and tightly coiled, planispiral shells. The species gregarium is a key ammonite within the Upper Callovian faunas of the Oxford Clay. Its presence in specific horizons makes it important in stratigraphy and paleontological studies, as it helps geologists identify biozones and correlate rock layers across different regions of Europe. MORPHOLOGY AND DISTINCTIVE TRAITSThis specimen displays the characteristic features of Prorsiceras gregarium, including well-defined ribs that extend symmetrically across the whorls. The shell is strongly coiled in a planispiral form, with compressed whorls and ornamentation typical of the genus. These features not only enhance the fossil’s visual appeal but also demonstrate adaptations that strengthened the shell and aided buoyancy control in Jurassic seas. The distinctive ribbing is particularly striking and makes this fossil easily identifiable within Callovian ammonite assemblages. SCIENTIFIC AND STRATIGRAPHIC IMPORTANCEProrsiceras gregarium is a significant index fossil for the Upper Callovian stage. Its presence in the Oxford Clay Formation contributes to the definition of ammonite biozones that geologists use to date and correlate Middle Jurassic strata. These fossils also provide insight into the evolutionary history of ammonites and the ecological dynamics of shallow marine environments. For collectors, Prorsiceras gregarium represents not only an attractive specimen but also an important piece of Earth’s geological timeline. CONDITION AND PRESENTATIONThe fossil has been professionally prepared to reveal its ribbing, whorl structure, and natural shell form. Its preservation is strong, with clear details that showcase the defining traits of this ammonite species. This is a one-of-a-kind specimen—not a reproduction or cast. The photographs provided show the exact fossil you will receive, ensuring complete confidence in your purchase. GUARANTEE OF AUTHENTICITYAll of our fossils are 100% genuine, responsibly sourced, and scientifically identified. Each specimen is supplied with a Certificate of Authenticity. This Prorsiceras gregarium ammonite fossil from Oxfordshire is a rare and scientifically valuable example of Jurassic marine life, making it an excellent addition for fossil collectors, natural history enthusiasts, and educational displays.
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