Staufenia Opalinoides Ammonite Fossil France Jurassic Genuine COA Lower Bajocian Collector Specimen Middle Jurassic Display Fossil
£ 12.60
GENUINE STAUFENIA OPALINOIDES AMMONITE FOSSILThis listing is for a genuine Staufenia opalinoides ammonite fossil from the
Middle Jurassic, Lower Bajocian of France. This carefully chosen fossil specimen has been selected for its natural fossil character, geological interest, and classic Jurassic display appeal. The photograph shows the actual specimen you will receive, so please refer to the photo for the full sizing, proportions, preservation, colour, matrix, surface texture, and overall condition of this individual fossil.This fossil is supplied with a Certificate of Authenticity lifetime guarantee generic card, giving confidence that the specimen is a genuine fossil and not a modern replica.SPECIES AND FOSSIL TYPEStaufenia opalinoides is an extinct ammonite species, a marine cephalopod that lived during the Jurassic Period. Ammonites were related to modern squid, cuttlefish, octopus, and nautilus, but they lived inside coiled, chambered shells. The living animal occupied the final outer body chamber, while the earlier internal chambers helped regulate buoyancy, allowing the ammonite to move through the ancient sea.Staufenia is a recognised Jurassic ammonite genus associated with the early Middle Jurassic. Ammonites of this type are valued by collectors for their classic spiral form, scientific importance, and connection to ancient marine environments. Their shells preserve growth, form, and structure in a way that makes them both attractive display fossils and useful palaeontological specimens.MIDDLE JURASSIC LOWER BAJOCIAN AGEThis fossil dates from the Lower Bajocian Stage of the Middle Jurassic, approximately 170 million years old. The Bajocian followed the Aalenian and represents an important period of ammonite evolution in the Jurassic seas of Europe. During this time, ammonites diversified into a wide variety of forms, many of which are important for comparing and dating marine rock layers.The Lower Bajocian was a time of warm marine conditions, with seas supporting ammonites, belemnites, bivalves, brachiopods, gastropods, echinoids, fish, and other ancient marine animals. Fossils from this stage are especially interesting because they record a period of rapid faunal change and provide a direct connection to the rich cephalopod life of the Middle Jurassic.FRENCH JURASSIC GEOLOGYFrance has a highly important Jurassic fossil record, with many areas preserving marine sediments deposited when large parts of Europe were covered by shallow to moderately deep seas. During the Lower Bajocian, the region that is now France formed part of a broad marine realm connected to wider European and Tethyan waters. Sediments such as limestone, marl, clay, and carbonate-rich deposits accumulated on the sea floor and preserved the remains of marine life.After death, ammonite shells could settle into soft sediment and become buried. Over millions of years, pressure, mineral-rich groundwater, and natural geological processes transformed the shell into a fossil. Later uplift and erosion exposed these ancient fossil-bearing layers, allowing specimens such as this Staufenia opalinoides ammonite to be recovered.MORPHOLOGY AND NATURAL FEATURESStaufenia ammonites display the classic planispiral coiled shell form typical of many Jurassic ammonites. The shell grew by adding new material around the outer whorl, with earlier growth stages remaining visible toward the centre. Features such as whorl shape, umbilicus width, ribbing, shell compression, chamber traces, and suture pattern are important in ammonite identification.The species name opalinoides reflects its relationship to ammonite forms associated with the opalinum group of early Middle Jurassic faunas. Depending on preservation, this specimen may show natural shell curvature, ribbing or growth lines, mineralisation, matrix, surface texture, colour variation, or geological wear from burial and exposure. These features are part of the specimen’s natural history and make every genuine ammonite unique.ANCIENT MARINE LIFEDuring life, Staufenia opalinoides would have been part of a diverse Jurassic marine ecosystem. Ammonites were active swimming cephalopods that used their chambered shells to control buoyancy and maintain balance in the water. They likely fed on small marine organisms or scavenged available food, while also forming part of the food chain for larger predators such as fish and marine reptiles.The coiled shell was both protective and functional, allowing the animal to grow while remaining efficient in the water. After the ammonite died, the shell settled onto the sea floor, became buried by sediment, and began the long fossilisation process that preserved it for millions of years.COLLECTOR DISPLAY AND AUTHENTICITYThis Staufenia opalinoides ammonite fossil from France is ideal for fossil collectors, geology enthusiasts, natural history displays, educational collections, cabinet specimens, and anyone interested in genuine Jurassic fossils. It is especially suitable for collectors of ammonites, fossil cephalopods, French fossils, Middle Jurassic specimens, Lower Bajocian fossils, and ancient marine life.The fossil shown in the photograph is the actual specimen you will receive. Please check the photo carefully for full sizing and condition details, including any natural cracks, matrix, mineralisation, colour variation, preparation marks, surface wear, or other natural features. These characteristics are normal in genuine fossils and help demonstrate their long geological history.INCLUDED WITH THIS SPECIMENYour fossil will be supplied as a genuine specimen with a Certificate of Authenticity lifetime guarantee generic card. This makes it suitable for personal collecting, educational use, geology teaching, natural history display, or as a thoughtful gift for fossil lovers, palaeontology enthusiasts, students, teachers, and collectors of ancient marine specimens.
Middle Jurassic, Lower Bajocian of France. This carefully chosen fossil specimen has been selected for its natural fossil character, geological interest, and classic Jurassic display appeal. The photograph shows the actual specimen you will receive, so please refer to the photo for the full sizing, proportions, preservation, colour, matrix, surface texture, and overall condition of this individual fossil.This fossil is supplied with a Certificate of Authenticity lifetime guarantee generic card, giving confidence that the specimen is a genuine fossil and not a modern replica.SPECIES AND FOSSIL TYPEStaufenia opalinoides is an extinct ammonite species, a marine cephalopod that lived during the Jurassic Period. Ammonites were related to modern squid, cuttlefish, octopus, and nautilus, but they lived inside coiled, chambered shells. The living animal occupied the final outer body chamber, while the earlier internal chambers helped regulate buoyancy, allowing the ammonite to move through the ancient sea.Staufenia is a recognised Jurassic ammonite genus associated with the early Middle Jurassic. Ammonites of this type are valued by collectors for their classic spiral form, scientific importance, and connection to ancient marine environments. Their shells preserve growth, form, and structure in a way that makes them both attractive display fossils and useful palaeontological specimens.MIDDLE JURASSIC LOWER BAJOCIAN AGEThis fossil dates from the Lower Bajocian Stage of the Middle Jurassic, approximately 170 million years old. The Bajocian followed the Aalenian and represents an important period of ammonite evolution in the Jurassic seas of Europe. During this time, ammonites diversified into a wide variety of forms, many of which are important for comparing and dating marine rock layers.The Lower Bajocian was a time of warm marine conditions, with seas supporting ammonites, belemnites, bivalves, brachiopods, gastropods, echinoids, fish, and other ancient marine animals. Fossils from this stage are especially interesting because they record a period of rapid faunal change and provide a direct connection to the rich cephalopod life of the Middle Jurassic.FRENCH JURASSIC GEOLOGYFrance has a highly important Jurassic fossil record, with many areas preserving marine sediments deposited when large parts of Europe were covered by shallow to moderately deep seas. During the Lower Bajocian, the region that is now France formed part of a broad marine realm connected to wider European and Tethyan waters. Sediments such as limestone, marl, clay, and carbonate-rich deposits accumulated on the sea floor and preserved the remains of marine life.After death, ammonite shells could settle into soft sediment and become buried. Over millions of years, pressure, mineral-rich groundwater, and natural geological processes transformed the shell into a fossil. Later uplift and erosion exposed these ancient fossil-bearing layers, allowing specimens such as this Staufenia opalinoides ammonite to be recovered.MORPHOLOGY AND NATURAL FEATURESStaufenia ammonites display the classic planispiral coiled shell form typical of many Jurassic ammonites. The shell grew by adding new material around the outer whorl, with earlier growth stages remaining visible toward the centre. Features such as whorl shape, umbilicus width, ribbing, shell compression, chamber traces, and suture pattern are important in ammonite identification.The species name opalinoides reflects its relationship to ammonite forms associated with the opalinum group of early Middle Jurassic faunas. Depending on preservation, this specimen may show natural shell curvature, ribbing or growth lines, mineralisation, matrix, surface texture, colour variation, or geological wear from burial and exposure. These features are part of the specimen’s natural history and make every genuine ammonite unique.ANCIENT MARINE LIFEDuring life, Staufenia opalinoides would have been part of a diverse Jurassic marine ecosystem. Ammonites were active swimming cephalopods that used their chambered shells to control buoyancy and maintain balance in the water. They likely fed on small marine organisms or scavenged available food, while also forming part of the food chain for larger predators such as fish and marine reptiles.The coiled shell was both protective and functional, allowing the animal to grow while remaining efficient in the water. After the ammonite died, the shell settled onto the sea floor, became buried by sediment, and began the long fossilisation process that preserved it for millions of years.COLLECTOR DISPLAY AND AUTHENTICITYThis Staufenia opalinoides ammonite fossil from France is ideal for fossil collectors, geology enthusiasts, natural history displays, educational collections, cabinet specimens, and anyone interested in genuine Jurassic fossils. It is especially suitable for collectors of ammonites, fossil cephalopods, French fossils, Middle Jurassic specimens, Lower Bajocian fossils, and ancient marine life.The fossil shown in the photograph is the actual specimen you will receive. Please check the photo carefully for full sizing and condition details, including any natural cracks, matrix, mineralisation, colour variation, preparation marks, surface wear, or other natural features. These characteristics are normal in genuine fossils and help demonstrate their long geological history.INCLUDED WITH THIS SPECIMENYour fossil will be supplied as a genuine specimen with a Certificate of Authenticity lifetime guarantee generic card. This makes it suitable for personal collecting, educational use, geology teaching, natural history display, or as a thoughtful gift for fossil lovers, palaeontology enthusiasts, students, teachers, and collectors of ancient marine specimens.
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