Phylloceras Fossil Ammonite, Oxfordian Jurassic, Madagascar – Authentic Collector Specimen with COA

Description A stunning and genuine Phylloceras fossil ammonite, collected from Oxfordian Stage deposits of the Late Jurassic Period, found in Madagascar. This elegant fossil specimen is a classic representative of the smooth-shelled Phylloceratidae family, well known for their refined, high-suture ammonites. Taxonomic Classification: Genus: Phylloceras Order: Ammonitida Superfamily: Phylloceratoidea Family: Phylloceratidae Originally described by Suess in 1865, Phylloceras is among the most long-lived and morphologically conservative Jurassic ammonites. Geological Context: Stage: Oxfordian (Late Jurassic) Age: Approximately 163 to 157 million years old Location: Madagascar Depositional Environment: Open marine shelf or upper slope settings; Phylloceras species were nektonic, free-swimming ammonites that inhabited deeper waters than many contemporaries Biozone: Not zonally diagnostic but commonly occurs throughout Oxfordian strata in Madagascar and globally Morphological Features: Highly involute coiling, with a smooth outer shell lacking prominent ribbing Finely preserved suture lines with intricate lobes and saddles Typically oval cross-section and compressed shell profile Often displays subtle iridescence or calcite preservation when polished Scientific & Display Significance: Phylloceras is a key genus for understanding the evolution and diversity of early ammonites Its longevity and wide distribution make it important for global Jurassic biostratigraphy Madagascan specimens are admired for their preservation and are frequently used in educational collections and decorative fossil displays The specimen shown includes a 1cm scale cube for reference. You will receive the exact fossil photographed, professionally prepared to best reveal its natural form. Authenticity Guaranteed: This is a 100% genuine fossil ammonite, provided with a Certificate of Authenticity. A perfect specimen for fossil collectors, natural history enthusiasts, or educational display. Please review the photographs for exact size and condition. A beautiful example of Oxfordian Phylloceras from Madagascar’s celebrated Jurassic marine deposits.