Dorsetensia Ammonite Fossil Jurassic France Genuine COA Card Collector Specimen - Bajocian Marine Cephalopod Display Fossil
£ 36.00
Dorsetensia sp. Ammonite Fossil from FranceThis is a genuine Dorsetensia sp. ammonite fossil from the Middle Jurassic,
Bajocian stage, collected from France. This carefully chosen fossil is a desirable European Jurassic marine cephalopod specimen, selected for its natural form, geological interest, and collectable display appeal. It is supplied with a Certificate of Authenticity lifetime guarantee generic card, making it a trusted addition to an ammonite collection, fossil cabinet, educational geology display, natural history collection, or prehistoric gift selection.The photograph shows the actual fossil specimen you will receive. Full sizing and scale can be seen in the photo.Geological Age and LocationThis ammonite dates to the Bajocian stage of the Middle Jurassic, approximately 170 million years old. The Bajocian was an important interval in ammonite evolution, with many distinctive forms developing in the warm marine seas of Europe. Ammonites from this stage are highly valued by collectors and geologists because their rapidly changing shell forms make them useful for dating and correlating Jurassic rock layers.France is internationally recognised for its rich Jurassic fossil deposits, including limestones, marls, clays, and shell-rich marine sediments. During the Middle Jurassic, large parts of what is now France were covered by shallow to moderately deep seas connected to wider European marine basins and the ancient Tethys Ocean. These conditions supported diverse marine ecosystems and preserved many classic ammonite faunas.Fossil Type and IdentificationThis fossil is identified as Dorsetensia sp., an extinct ammonite from the Middle Jurassic. The “sp.” designation means the specimen has been identified to genus level, while the exact species is left open. This is commonly used for ammonites where natural preservation, wear, or visible diagnostic details do not allow a confident species-level assignment.Dorsetensia is a recognised Bajocian ammonite genus and forms part of the diverse ammonoid cephalopod faunas of the Middle Jurassic. Ammonites were marine molluscs related to modern squid, cuttlefish, octopus, and nautilus. They had hard external shells divided internally into chambers. The living animal occupied the outer body chamber, while the earlier chambers helped regulate buoyancy, allowing the ammonite to move through the water column.Morphology and Notable FeaturesDorsetensia ammonites are appreciated for their classic Jurassic spiral form and attractive shell structure. The shell is typically planispiral, with whorls arranged around a central umbilicus. Depending on preservation, specimens may show visible whorl structure, ribbing, natural shell surface, mineralisation, and growth detail preserved in the fossil.The coiled shell records the life of the animal as it grew, with each new whorl representing a later stage of development. Internal chamber walls, known as septa, divided the shell, and the lines where these walls met the shell surface formed suture patterns. These features are important in ammonite classification and contribute to the scientific interest of the specimen.As a genuine fossil, this specimen may show natural matrix, fossil shell texture, mineral staining, colour variation, weathering, small chips, cracks, or areas of natural wear caused by fossilisation and geological history. These natural features are normal for authentic fossil specimens and add individuality to the piece. The photo shows the exact fossil being offered, allowing the buyer to view its preservation, condition, size, and display quality before purchase.Middle Jurassic Marine EnvironmentThis Dorsetensia ammonite lived in a warm Jurassic sea during the Bajocian. These ancient marine environments supported a rich ecosystem of swimming cephalopods, fish, and seabed-dwelling invertebrates. Ammonites and belemnites moved through the water column, while bivalves, brachiopods, gastropods, echinoids, crinoids, and other marine organisms lived on or within the seabed.Ammonites were active swimming or drifting animals, likely feeding on small prey using tentacles. After death, the shell could sink to the seabed and become buried by sediment. Over millions of years, mineralisation, compaction, and geological change transformed the shell and surrounding sediment into fossil-bearing rock. This specimen is a direct link to the Middle Jurassic seas of France, when dinosaurs lived on land and ammonites flourished in the oceans.Authenticity and CollectabilityThis Dorsetensia sp. ammonite fossil is a genuine specimen from France, dating to the Bajocian stage of the Middle Jurassic, and includes a Certificate of Authenticity lifetime guarantee generic card. It is suitable for collectors of French fossils, Jurassic ammonites, Bajocian fossils, Middle Jurassic marine fossils, European fossils, natural history specimens, educational geology pieces, and display fossils.This carefully selected fossil includes a Certificate of Authenticity lifetime guarantee generic card, and the fossil shown in the photo is the actual specimen you will receive.
Bajocian stage, collected from France. This carefully chosen fossil is a desirable European Jurassic marine cephalopod specimen, selected for its natural form, geological interest, and collectable display appeal. It is supplied with a Certificate of Authenticity lifetime guarantee generic card, making it a trusted addition to an ammonite collection, fossil cabinet, educational geology display, natural history collection, or prehistoric gift selection.The photograph shows the actual fossil specimen you will receive. Full sizing and scale can be seen in the photo.Geological Age and LocationThis ammonite dates to the Bajocian stage of the Middle Jurassic, approximately 170 million years old. The Bajocian was an important interval in ammonite evolution, with many distinctive forms developing in the warm marine seas of Europe. Ammonites from this stage are highly valued by collectors and geologists because their rapidly changing shell forms make them useful for dating and correlating Jurassic rock layers.France is internationally recognised for its rich Jurassic fossil deposits, including limestones, marls, clays, and shell-rich marine sediments. During the Middle Jurassic, large parts of what is now France were covered by shallow to moderately deep seas connected to wider European marine basins and the ancient Tethys Ocean. These conditions supported diverse marine ecosystems and preserved many classic ammonite faunas.Fossil Type and IdentificationThis fossil is identified as Dorsetensia sp., an extinct ammonite from the Middle Jurassic. The “sp.” designation means the specimen has been identified to genus level, while the exact species is left open. This is commonly used for ammonites where natural preservation, wear, or visible diagnostic details do not allow a confident species-level assignment.Dorsetensia is a recognised Bajocian ammonite genus and forms part of the diverse ammonoid cephalopod faunas of the Middle Jurassic. Ammonites were marine molluscs related to modern squid, cuttlefish, octopus, and nautilus. They had hard external shells divided internally into chambers. The living animal occupied the outer body chamber, while the earlier chambers helped regulate buoyancy, allowing the ammonite to move through the water column.Morphology and Notable FeaturesDorsetensia ammonites are appreciated for their classic Jurassic spiral form and attractive shell structure. The shell is typically planispiral, with whorls arranged around a central umbilicus. Depending on preservation, specimens may show visible whorl structure, ribbing, natural shell surface, mineralisation, and growth detail preserved in the fossil.The coiled shell records the life of the animal as it grew, with each new whorl representing a later stage of development. Internal chamber walls, known as septa, divided the shell, and the lines where these walls met the shell surface formed suture patterns. These features are important in ammonite classification and contribute to the scientific interest of the specimen.As a genuine fossil, this specimen may show natural matrix, fossil shell texture, mineral staining, colour variation, weathering, small chips, cracks, or areas of natural wear caused by fossilisation and geological history. These natural features are normal for authentic fossil specimens and add individuality to the piece. The photo shows the exact fossil being offered, allowing the buyer to view its preservation, condition, size, and display quality before purchase.Middle Jurassic Marine EnvironmentThis Dorsetensia ammonite lived in a warm Jurassic sea during the Bajocian. These ancient marine environments supported a rich ecosystem of swimming cephalopods, fish, and seabed-dwelling invertebrates. Ammonites and belemnites moved through the water column, while bivalves, brachiopods, gastropods, echinoids, crinoids, and other marine organisms lived on or within the seabed.Ammonites were active swimming or drifting animals, likely feeding on small prey using tentacles. After death, the shell could sink to the seabed and become buried by sediment. Over millions of years, mineralisation, compaction, and geological change transformed the shell and surrounding sediment into fossil-bearing rock. This specimen is a direct link to the Middle Jurassic seas of France, when dinosaurs lived on land and ammonites flourished in the oceans.Authenticity and CollectabilityThis Dorsetensia sp. ammonite fossil is a genuine specimen from France, dating to the Bajocian stage of the Middle Jurassic, and includes a Certificate of Authenticity lifetime guarantee generic card. It is suitable for collectors of French fossils, Jurassic ammonites, Bajocian fossils, Middle Jurassic marine fossils, European fossils, natural history specimens, educational geology pieces, and display fossils.This carefully selected fossil includes a Certificate of Authenticity lifetime guarantee generic card, and the fossil shown in the photo is the actual specimen you will receive.
