Grossouvria kontkiewiczi Fossil Ammonite – Oxfordian Jurassic – Madagascar – Authentic with Certificate – Display Specimen

Description This listing features a stunning and 100% authentic Grossouvria kontkiewiczi fossil ammonite from the Oxfordian Stage of the Upper Jurassic, discovered in Madagascar. This is a scientifically notable and visually appealing ammonite species, representing the complex and highly ornamented lineage of Late Jurassic ammonoids. This is a genuine fossil specimen, selected for quality and preservation. The photo shows the exact item you will receive, with a scale cube (1cm) included for accurate sizing—please refer to the images for full dimensions. Species & Classification: Species: Grossouvria kontkiewiczi Genus: Grossouvria Family: Grossouvriidae Superfamily: Perisphinctoidea Order: Ammonitida Class: Cephalopoda Phylum: Mollusca Geological & Stratigraphic Context: Period: Jurassic Epoch: Late Jurassic Stage: Oxfordian (approx. 163.5 – 157.3 million years ago) Locality: Morondava Basin Region, Madagascar Depositional Environment: Shallow epicontinental sea with carbonate-rich sedimentation Geological Significance: The Oxfordian ammonite faunas of Madagascar are of major stratigraphic importance, enabling wide biostratigraphic correlation across Gondwanan continents. Morphology & Features: Strongly ribbed, moderately involute shell Characteristic bifurcating ribs that may terminate in small tubercles Often shows a compressed whorl section with a sharp venter The ornamentation is diagnostic for Grossouvria and useful in Jurassic zonation studies Beautiful preservation often enhanced by natural mineralisation in the matrix Notable Facts: Grossouvria kontkiewiczi is named in honour of Russian palaeontologist Professor Kontkiewicz and belongs to a genus identified and described in the 19th century by E. Haug and other European palaeontologists. Specimens from Madagascar provide exceptional clarity for study due to their three-dimensional preservation in limestone nodules. Why Buy This Fossil? ✔ 100% Genuine and legally sourced fossil ✔ Comes with a Certificate of Authenticity ✔ Scientifically significant species from a classic Jurassic locality ✔ Exact specimen as pictured – no surprises ✔ Ideal for collectors, educators, or as a stunning display piece This Grossouvria kontkiewiczi fossil ammonite is a rare and valuable addition to any collection, offering both visual appeal and palaeontological importance. Don’t miss the opportunity to own a remarkable fossil from the heart of Jurassic Madagascar.