Rare Reineckites duplex Ammonite Fossil Jurassic Dorset UK Genuine Authentic COA
£ 14.40
AUTHENTIC JURASSIC FOSSIL FROM DORSET, UKThis rare Reineckites duplex ammonite fossil is an exceptional specimen from the
Upper Callovian stage of the Middle Jurassic, discovered in Dorset, United Kingdom. Carefully chosen for both its scientific and aesthetic qualities, this fossil captures the beauty and complexity of an extinct marine creature preserved for over 163 million years. The specimen comes complete with a Certificate of Authenticity, and the photographs provided show the actual fossil you will receive. Scale rule squares of 1 cm are included for accurate size reference. GEOLOGICAL AGE AND FORMATIONDating to the Upper Callovian stage of the Jurassic Period, this ammonite lived during a time when southern England was covered by warm, shallow seas that formed part of the vast marine environments of the Jurassic world. The sedimentary deposits in Dorset, especially those within the Oxford Clay Formation and associated Callovian strata, are globally renowned for their richness in ammonites and other marine fossils. These mud-rich seabed conditions were ideal for fossil preservation, allowing delicate shell structures and fine ribbing patterns to be retained for millions of years. FOSSIL SPECIES AND SCIENTIFIC CLASSIFICATIONReineckites duplex belongs to the class Cephalopoda, order Ammonitida, within the superfamily Perisphinctoidea. This ammonite genus is characterised by its strongly ribbed, planispiral shell with bifurcating ribs (hence the name “duplex,” meaning doubled), which branch from the umbilical seam and extend across the shell’s whorl. These features are diagnostic traits used by paleontologists to distinguish Reineckites from closely related genera. The ribbing pattern not only gives the fossil striking visual appeal but also provides insight into the evolutionary adaptations of ammonites during the Callovian. MORPHOLOGY AND NOTABLE TRAITSThe ribbing on this specimen is well preserved, showing the distinctive duplex rib pattern for which the species is named. Its whorls expand regularly, and the shell maintains a compressed, planispiral form typical of ammonites within its family. Such ribbing may have strengthened the shell structure and influenced hydrodynamics as the ammonite navigated Jurassic seas. These morphological features make Reineckites duplex an important genus for both scientific study and fossil collectors who value clear, well-defined ornamentation. SCIENTIFIC IMPORTANCE AND BIOZONE RELEVANCEAmmonites such as Reineckites duplex are key stratigraphic fossils, meaning they are used by geologists to define and correlate specific layers of rock within the Jurassic sequence. The presence of this species is closely associated with Upper Callovian ammonite biozones, providing essential data for reconstructing the timeline of marine environments in Europe during this stage of Earth’s history. Collectors and researchers alike value such fossils for their role in understanding paleoenvironments and evolutionary history. CONDITION AND PRESENTATIONThis fossil has been carefully prepared to preserve its natural beauty while ensuring durability for long-term collection and display. The ribbing, shell curvature, and fine details of the whorl are clearly visible. It is a genuine, one-of-a-kind specimen—not a cast or replica. The fossil you see in the photographs is the exact one you will receive, ensuring complete transparency and buyer confidence. GUARANTEE OF AUTHENTICITYAll of our fossils are 100% genuine specimens, ethically sourced and scientifically identified. Each fossil is accompanied by a Certificate of Authenticity, giving you complete assurance of its provenance and authenticity. Whether for a collector, educator, or enthusiast of natural history, this Reineckites duplex ammonite fossil represents a rare and scientifically significant piece of the Jurassic seas of Dorset.
Upper Callovian stage of the Middle Jurassic, discovered in Dorset, United Kingdom. Carefully chosen for both its scientific and aesthetic qualities, this fossil captures the beauty and complexity of an extinct marine creature preserved for over 163 million years. The specimen comes complete with a Certificate of Authenticity, and the photographs provided show the actual fossil you will receive. Scale rule squares of 1 cm are included for accurate size reference. GEOLOGICAL AGE AND FORMATIONDating to the Upper Callovian stage of the Jurassic Period, this ammonite lived during a time when southern England was covered by warm, shallow seas that formed part of the vast marine environments of the Jurassic world. The sedimentary deposits in Dorset, especially those within the Oxford Clay Formation and associated Callovian strata, are globally renowned for their richness in ammonites and other marine fossils. These mud-rich seabed conditions were ideal for fossil preservation, allowing delicate shell structures and fine ribbing patterns to be retained for millions of years. FOSSIL SPECIES AND SCIENTIFIC CLASSIFICATIONReineckites duplex belongs to the class Cephalopoda, order Ammonitida, within the superfamily Perisphinctoidea. This ammonite genus is characterised by its strongly ribbed, planispiral shell with bifurcating ribs (hence the name “duplex,” meaning doubled), which branch from the umbilical seam and extend across the shell’s whorl. These features are diagnostic traits used by paleontologists to distinguish Reineckites from closely related genera. The ribbing pattern not only gives the fossil striking visual appeal but also provides insight into the evolutionary adaptations of ammonites during the Callovian. MORPHOLOGY AND NOTABLE TRAITSThe ribbing on this specimen is well preserved, showing the distinctive duplex rib pattern for which the species is named. Its whorls expand regularly, and the shell maintains a compressed, planispiral form typical of ammonites within its family. Such ribbing may have strengthened the shell structure and influenced hydrodynamics as the ammonite navigated Jurassic seas. These morphological features make Reineckites duplex an important genus for both scientific study and fossil collectors who value clear, well-defined ornamentation. SCIENTIFIC IMPORTANCE AND BIOZONE RELEVANCEAmmonites such as Reineckites duplex are key stratigraphic fossils, meaning they are used by geologists to define and correlate specific layers of rock within the Jurassic sequence. The presence of this species is closely associated with Upper Callovian ammonite biozones, providing essential data for reconstructing the timeline of marine environments in Europe during this stage of Earth’s history. Collectors and researchers alike value such fossils for their role in understanding paleoenvironments and evolutionary history. CONDITION AND PRESENTATIONThis fossil has been carefully prepared to preserve its natural beauty while ensuring durability for long-term collection and display. The ribbing, shell curvature, and fine details of the whorl are clearly visible. It is a genuine, one-of-a-kind specimen—not a cast or replica. The fossil you see in the photographs is the exact one you will receive, ensuring complete transparency and buyer confidence. GUARANTEE OF AUTHENTICITYAll of our fossils are 100% genuine specimens, ethically sourced and scientifically identified. Each fossil is accompanied by a Certificate of Authenticity, giving you complete assurance of its provenance and authenticity. Whether for a collector, educator, or enthusiast of natural history, this Reineckites duplex ammonite fossil represents a rare and scientifically significant piece of the Jurassic seas of Dorset.
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