Graphoceras concavum Ammonite Fossil Middle Jurassic Germany Genuine COA Bajocian Dogger Beta Geisingen Display Specimen
£ 60.00
GENUINE GRAPHOCERAS CONCAVUM AMMONITE FOSSILThis listing is for a genuine Graphoceras concavum ammonite fossil from the
Middle Jurassic, Bajocian, Dogger Beta, collected from Geisingen, Baden-Württemberg, Germany. This is a carefully chosen fossil specimen, selected for its classic Jurassic character, geological interest, and appeal as a collectable European ammonite display piece. The photograph shows the actual specimen you will receive, allowing you to view the fossil’s preservation, natural shell form, colour, matrix, surface detail, and overall appearance before purchase. For full sizing, please see the photo.This fossil is supplied with a Certificate of Authenticity lifetime guarantee generic card, confirming that it is a genuine fossil specimen. FOSSIL TYPE AND SPECIESGraphoceras concavum is an ammonite, an extinct marine cephalopod related to modern squid, cuttlefish, octopus, and nautilus. Ammonites lived in coiled, chambered shells and were among the most successful marine animals of the Mesozoic seas. The shell was divided internally into chambers, which helped regulate buoyancy, while the living animal occupied the final body chamber.The genus Graphoceras is a classic Middle Jurassic ammonite group, valued by collectors for its elegant coiled form and stratigraphic importance. Graphoceras concavum is associated with the Bajocian and is linked with the Concavum Zone, a recognised ammonite biozone used in Middle Jurassic correlation. Ammonites are especially important fossils because they evolved rapidly and were widely distributed across ancient seas, making them useful for comparing and dating rock layers. MIDDLE JURASSIC BAJOCIAN GEOLOGYThis fossil dates from the Middle Jurassic Period, specifically the Bajocian Stage, making it approximately 170 million years old. During the Bajocian, much of Europe was covered by warm, shallow epicontinental seas. These marine environments supported a rich ecosystem including ammonites, belemnites, bivalves, brachiopods, gastropods, crinoids, fish, and marine reptiles.The term Dogger Beta refers to part of the traditional German Middle Jurassic stratigraphic sequence. “Dogger” is commonly used in German and European geology for Middle Jurassic deposits, and ammonites from these beds are important for understanding the age and correlation of the rocks. The fossil was preserved after the ammonite shell settled onto an ancient sea floor, where sediment burial, compaction, mineral-rich groundwater, and geological pressure transformed it into the fossil seen today. GEISINGEN, BADEN-WÜRTTEMBERG LOCALITYThis specimen comes from Geisingen in Baden-Württemberg, Germany, a region with important Jurassic geology and a long history of fossil collecting. Southern Germany is well known for Mesozoic marine fossils, especially ammonites that record the ancient seas that once covered the region.A Graphoceras concavum ammonite from Geisingen is a desirable fossil for collectors of German Jurassic specimens, Bajocian ammonites, Dogger fossils, European ammonites, and scientifically labelled natural history display pieces. Its clearly stated locality and geological setting add strong educational and collectable value. SHELL FORM AND NATURAL FEATURESGraphoceras ammonites typically show a planispiral coiled shell with compressed whorls, a defined outer margin, and fine natural ornamentation. Depending on preservation, visible features may include subtle ribbing, growth lines, shell curvature, whorl compression, and keel-related structure along the outer edge. These characteristics formed as the animal grew and are key features used in ammonite study and identification.As a genuine fossil, this specimen may show natural features such as mineral staining, matrix attachment, ancient surface wear, weathered areas, slight compression, fine cracks, small chips, or partial preservation. These details are normal in authentic fossil material and form part of the specimen’s long geological history. The photo shows the exact fossil being offered, so every visible feature can be inspected before purchase. COLLECTABLE GERMAN JURASSIC DISPLAY SPECIMENThis Graphoceras concavum ammonite fossil is ideal for fossil collectors, geology students, educational collections, school teaching resources, natural history displays, or anyone interested in genuine Jurassic marine fossils. Its combination of Middle Jurassic age, Bajocian stage, Dogger Beta stratigraphy, German locality, and scientific species identification makes it a strong addition to any fossil cabinet or display collection.The specimen comes exactly as shown in the photo and includes a Certificate of Authenticity lifetime guarantee generic card, making it a reliable choice for collectors seeking a genuine Graphoceras ammonite, German Jurassic fossil, Bajocian specimen, Dogger Beta ammonite, or authentic natural history display piece.
Middle Jurassic, Bajocian, Dogger Beta, collected from Geisingen, Baden-Württemberg, Germany. This is a carefully chosen fossil specimen, selected for its classic Jurassic character, geological interest, and appeal as a collectable European ammonite display piece. The photograph shows the actual specimen you will receive, allowing you to view the fossil’s preservation, natural shell form, colour, matrix, surface detail, and overall appearance before purchase. For full sizing, please see the photo.This fossil is supplied with a Certificate of Authenticity lifetime guarantee generic card, confirming that it is a genuine fossil specimen. FOSSIL TYPE AND SPECIESGraphoceras concavum is an ammonite, an extinct marine cephalopod related to modern squid, cuttlefish, octopus, and nautilus. Ammonites lived in coiled, chambered shells and were among the most successful marine animals of the Mesozoic seas. The shell was divided internally into chambers, which helped regulate buoyancy, while the living animal occupied the final body chamber.The genus Graphoceras is a classic Middle Jurassic ammonite group, valued by collectors for its elegant coiled form and stratigraphic importance. Graphoceras concavum is associated with the Bajocian and is linked with the Concavum Zone, a recognised ammonite biozone used in Middle Jurassic correlation. Ammonites are especially important fossils because they evolved rapidly and were widely distributed across ancient seas, making them useful for comparing and dating rock layers. MIDDLE JURASSIC BAJOCIAN GEOLOGYThis fossil dates from the Middle Jurassic Period, specifically the Bajocian Stage, making it approximately 170 million years old. During the Bajocian, much of Europe was covered by warm, shallow epicontinental seas. These marine environments supported a rich ecosystem including ammonites, belemnites, bivalves, brachiopods, gastropods, crinoids, fish, and marine reptiles.The term Dogger Beta refers to part of the traditional German Middle Jurassic stratigraphic sequence. “Dogger” is commonly used in German and European geology for Middle Jurassic deposits, and ammonites from these beds are important for understanding the age and correlation of the rocks. The fossil was preserved after the ammonite shell settled onto an ancient sea floor, where sediment burial, compaction, mineral-rich groundwater, and geological pressure transformed it into the fossil seen today. GEISINGEN, BADEN-WÜRTTEMBERG LOCALITYThis specimen comes from Geisingen in Baden-Württemberg, Germany, a region with important Jurassic geology and a long history of fossil collecting. Southern Germany is well known for Mesozoic marine fossils, especially ammonites that record the ancient seas that once covered the region.A Graphoceras concavum ammonite from Geisingen is a desirable fossil for collectors of German Jurassic specimens, Bajocian ammonites, Dogger fossils, European ammonites, and scientifically labelled natural history display pieces. Its clearly stated locality and geological setting add strong educational and collectable value. SHELL FORM AND NATURAL FEATURESGraphoceras ammonites typically show a planispiral coiled shell with compressed whorls, a defined outer margin, and fine natural ornamentation. Depending on preservation, visible features may include subtle ribbing, growth lines, shell curvature, whorl compression, and keel-related structure along the outer edge. These characteristics formed as the animal grew and are key features used in ammonite study and identification.As a genuine fossil, this specimen may show natural features such as mineral staining, matrix attachment, ancient surface wear, weathered areas, slight compression, fine cracks, small chips, or partial preservation. These details are normal in authentic fossil material and form part of the specimen’s long geological history. The photo shows the exact fossil being offered, so every visible feature can be inspected before purchase. COLLECTABLE GERMAN JURASSIC DISPLAY SPECIMENThis Graphoceras concavum ammonite fossil is ideal for fossil collectors, geology students, educational collections, school teaching resources, natural history displays, or anyone interested in genuine Jurassic marine fossils. Its combination of Middle Jurassic age, Bajocian stage, Dogger Beta stratigraphy, German locality, and scientific species identification makes it a strong addition to any fossil cabinet or display collection.The specimen comes exactly as shown in the photo and includes a Certificate of Authenticity lifetime guarantee generic card, making it a reliable choice for collectors seeking a genuine Graphoceras ammonite, German Jurassic fossil, Bajocian specimen, Dogger Beta ammonite, or authentic natural history display piece.
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