Geisonoceras Orthoceras Fossil Orthocone | Middle Devonian Eifelian Morocco | Genuine Specimen with COA

Description Add a captivating piece of prehistoric marine life to your fossil collection with this genuine Geisonoceras (formerly grouped under Orthoceras) fossil orthocone from the Middle Devonian period, specifically the Eifelian stage, unearthed in the famous fossil-rich region near Alnif, Erfoud, Morocco. This exceptional specimen displays the long, chambered shell structure characteristic of ancient nautiloid cephalopods. Fossil Type: Orthocone Cephalopod Genus: Geisonoceras (previously Orthoceras) Geological Period: Middle Devonian (~393 to 388 million years ago) Geological Stage: Eifelian Location: Alnif, near Erfoud, Anti-Atlas Mountains, Morocco Scale Rule: Squares/Cube = 1cm (Please see photo for full sizing) Specimen: Actual fossil shown in the photo is what you will receive Authenticity: All of our fossils are 100% genuine specimens and come with a Certificate of Authenticity Geological and Paleontological Context Geisonoceras is a genus of extinct nautiloid cephalopods from the Order Orthocerida, known for its long, straight (orthoconic) shell composed of internal chambers. These marine invertebrates lived in open marine settings and played an important role in the Paleozoic marine ecosystem. Phylum: Mollusca Class: Cephalopoda Order: Orthocerida Family: Geisonoceratidae Superfamily: Orthocerataceae Geological Stage: Eifelian (Middle Devonian) Depositional Environment: Shallow marine shelf; fossil typically preserved in grey to black limestone indicative of low-energy sedimentation in a carbonate platform environment Morphological Features: Long, slender conical shell (orthocone) with visible internal septa and a siphuncle running longitudinally through the chambers; polished specimens reveal exquisite detail of these features Notable: Geisonoceras is distinguished from similar genera by the structure of its siphuncle and the spacing of septa. These orthocones are often used as biostratigraphic markers in Devonian carbonates Biozone: Not specifically assigned without exact stratigraphic data Identifier: Initially described and differentiated from Orthoceras by 19th-century paleontologists refining nautiloid classification Why This Fossil Stands Out This stunning Geisonoceras specimen has been carefully chosen and polished to enhance its natural features. It provides a detailed view of the phragmocone (chambered shell), ideal for both educational purposes and display. Sourced from one of the most prolific fossil sites in North Africa, it exemplifies the diversity and preservation quality of Devonian marine fossils. Why Buy From Us? 100% genuine fossil with Certificate of Authenticity Specimen shown is the exact item you will receive Sourced from trusted suppliers in Morocco Perfect for collectors, educators, or as a striking natural display piece Own a real relic of Earth’s ancient oceans — this Geisonoceras orthocone fossil from the Middle Devonian Eifelian stage of Morocco brings prehistoric marine history to life in stunning form.