Iridescent Polished Ammonite Fossil from the Cretaceous of Madagascar Genuine Display Specimen COA

Description Authentic Iridescent Polished Ammonite – Cretaceous, Madagascar This listing presents a genuine iridescent polished ammonite fossil from the Cretaceous Period, sourced from Madagascar, a world-renowned locality for beautifully preserved and naturally colourful ammonites. The specimen has been carefully selected for its strong iridescence, balanced form, and overall display quality. The photographs show the exact fossil you will receive, with full sizing details provided in the listing images. As with all our fossils, this piece is 100% genuine and supplied with a Certificate of Authenticity. Geological Age and Setting – Cretaceous Marine Seas The Cretaceous Period (approximately 145–66 million years ago) was a time of expansive shallow seas and extraordinary marine biodiversity. During this era, Madagascar lay within warm tropical waters connected to the ancient Tethys Ocean. These conditions supported vast populations of ammonites, which thrived as active nektonic predators in open marine environments. Fine-grained marine sediments rapidly buried ammonite shells after death, protecting them from erosion. Over millions of years, mineral-rich waters replaced and preserved the original shell material. In some specimens, the original nacreous shell layers were preserved and later enhanced through careful polishing, revealing spectacular natural iridescence. Fossil Type – Iridescent Polished Ammonite Ammonites were extinct marine cephalopods closely related to modern squid and cuttlefish. Their coiled shells were divided into chambers that regulated buoyancy, allowing them to occupy a wide range of marine depths. The specimen offered here has been professionally polished to reveal the internal shell structure and the naturally occurring iridescent layers within the fossilised shell. Notable features commonly visible on iridescent polished ammonites include: Vivid colour play, with flashes of green, gold, red, and blue Clearly defined spiral coiling, preserved in three dimensions Distinct chamber structure, visible through the polished surface Smooth, high-gloss finish, enhancing natural colour and detail Strong visual symmetry, ideal for display The iridescence results from microscopic layering within the fossil shell that refracts light, producing shifting colours depending on viewing angle. Madagascar – A Premier Source of Iridescent Ammonites Madagascar is internationally recognised as one of the finest sources of Cretaceous ammonites, particularly those exhibiting natural iridescence. The island’s sedimentary basins provided the ideal chemical and physical conditions for preserving shell material capable of producing this colour effect. Specimens from Madagascar are widely collected by museums, private collectors, and interior designers due to their combination of scientific importance and striking natural beauty. Polished examples are especially sought after for display, as they highlight features not visible in unprepared fossils. Scientific and Display Significance Iridescent ammonites are valued for both their palaeontological importance and aesthetic impact. They provide insight into ancient marine ecosystems while also serving as dramatic natural art pieces formed by geological processes over tens of millions of years. This specimen is well suited for: Fossil and natural history collections Educational and teaching displays High-quality interior décor Gifts for fossil and geology enthusiasts The durability of the fossil and polished surface ensures long-term stability when properly displayed. Your Genuine Fossil Specimen Fossil Type: Iridescent polished ammonite Geological Age: Cretaceous Period Locality: Madagascar Authenticity: 100% genuine fossil with Certificate of Authenticity Condition: Carefully selected, polished display specimen Sizing: Full measurements shown in listing photographs Exact Specimen Shown: You will receive the fossil pictured This iridescent polished ammonite from Madagascar offers a rare combination of geological authenticity, vibrant natural colour, and refined presentation. It is a striking and timeless piece that brings the beauty of ancient Cretaceous seas into any fossil collection or display.