{"product_id":"91mm-perisphinctes-ammonite-fossil-nautilus-madagascar-jurassic-age-coa-06jzz821","title":"91MM Perisphinctes Ammonite Fossil Nautilus Madagascar Jurassic Age COA","description":"\u003cp\u003eLocation: Near Sakaraha, Tulear Province, Madagascar\u003c\/p\u003e\n\u003cp\u003eWeight: 8.3 Ounces\u003c\/p\u003e\n\u003cp\u003eDimensions: 91MM - 3.6 inches long, 3.4 inches wide, 1.1 inches thick\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"color: #b45f06;\"\u003e\u003cstrong\u003eComes with a Certificate of Authenticity. \u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan style=\"color: #38761d;\"\u003eThe items pictured are the ones you will receive. \u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003chr\u003e\n\u003cp\u003e\u003cspan style=\"color: #b45f06;\"\u003e\u003cstrong\u003ePerisphinctes Ammonite\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003ePerisphinctes \u003cspan style=\"color: rgb(172, 92, 6);\"\u003e\u003cstrong\u003eammonite\u003c\/strong\u003e\u003c\/span\u003e exemplifies the taxonomic diversity of Jurassic cephalopods. As members of the subclass Ammonoidea, these organisms occupied critical ecological niches in marine food webs from the Triassic through the Cretaceous periods, spanning approximately 175 million years of evolutionary history. The specimen's characteristic ribbed morphology and logarithmic spiral geometry reflect adaptive features that enhanced hydrodynamic efficiency during predation and migration. Phylogenetically related to extant Nautiloidea, ammonites represent a distinct lineage that underwent mass extinction at the K-Pg boundary. This Madagascar-sourced fossil, authenticated with documentation, provides paleontological significance for both scientific study and connoisseur collections, offering tangible evidence of ancient marine biodiversity.\u003c\/p\u003e\n\u003chr\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/1250\/0441\/files\/Perisphinctes_Ammonite.jpg?v=1723759275\" alt=\"\"\u003e\u003c\/p\u003e\n\u003chr\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp style=\"text-align: left;\"\u003e \u003c\/p\u003e","brand":"MADDEN25","offers":[{"title":"Default Title","offer_id":52428096373016,"sku":"06JZZ821","price":38.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1250\/0441\/files\/5U8A9363.jpg?v=1784662588","url":"https:\/\/www.fossilageminerals.com\/products\/91mm-perisphinctes-ammonite-fossil-nautilus-madagascar-jurassic-age-coa-06jzz821","provider":"Fossil Age Minerals","version":"1.0","type":"link"}