RARE Tropidoceras masseanum Ammonite Fossil | Pliensbachian Jurassic | Hornsea, Holderness, UK | Genuine Fossil with COA

Description Featured here is a RARE fossil ammonite: Tropidoceras masseanum, originating from the Pliensbachian stage of the Lower Jurassic, collected from the Hornsea coast in the Holderness region, United Kingdom. This beautifully preserved fossil captures the classic coiled shell morphology typical of early Jurassic ammonites. It is a 100% genuine specimen, carefully selected and backed by a Certificate of Authenticity. The photo shows the exact fossil you will receive, with a 1cm scale cube included for reference. Geological & Scientific Information: Species: Tropidoceras masseanum Type: Fossil Ammonite (extinct marine cephalopod) Geological Period: Jurassic Stage: Pliensbachian (approx. 190.8 to 182.7 million years ago) Location Found: Hornsea, Holderness Coast, East Yorkshire, United Kingdom Order: Ammonitida Superfamily: Eoderoceratoidea Family: Tropidoceratidae Morphological Features: Typically exhibits strongly ribbed evolute shells, with a pronounced keel and deep whorls. The ribbing aids in identifying growth stages and evolutionary relationships. This specimen displays fine ribbing with intact sutures, making it a valuable collector’s piece. Depositional Environment: Collected from marine clay and shale deposits typical of the Holderness coastline, formed in an ancient shallow epicontinental sea that once covered much of Jurassic Britain. Scientific Importance: Tropidoceras is a key taxon for biostratigraphic dating within Lower Jurassic ammonite zones. Its presence helps geologists correlate Pliensbachian sequences across Europe. Additional Notes: The erosion-prone cliffs of Holderness are among the fastest-eroding coastlines in Europe, occasionally revealing remarkable fossil finds like this ammonite. The rarity of such complete specimens, especially from the Pliensbachian, makes this a collector’s highlight. Why Buy From Us? 100% authentic fossils from trusted sources Includes a Certificate of Authenticity Exact specimen shown in photos Ideal for collectors, educators, and fossil enthusiasts This Tropidoceras masseanum ammonite fossil is a rare opportunity to own a genuine piece of Britain’s Jurassic heritage. A must-have for any fossil collection!