Rare Deshayesites deshayesi Iridescent Ammonite Fossil Lower Albian Cretaceous Madagascar

Description ChatGPT said:   Selling Title Rare Deshayesites deshayesi Iridescent Ammonite Fossil Lower Albian Cretaceous Madagascar Rare Deshayesites deshayesi Iridescent Ammonite Fossil from Lower Albian Cretaceous Madagascar with Certificate Long Description Rare Deshayesites deshayesi Iridescent Ammonite Fossil Offered here is a remarkable and rare Deshayesites deshayesi iridescent ammonite fossil from the Lower Albian stage of the Early Cretaceous, discovered in Madagascar. This specimen is a striking example of natural history, showcasing both scientific importance and visual beauty. The fossil retains stunning iridescence, a shimmering quality caused by the nacreous shell layers preserved over millions of years. The photos show the exact fossil you will receive, with a 1 cm scale cube included for accurate sizing. Every piece is a genuine specimen and is supplied with a Certificate of Authenticity. Geological Setting – Lower Albian, Early Cretaceous This ammonite originates from the Lower Albian stage (approximately 113–110 million years ago), part of the Early Cretaceous period. During this time, Madagascar formed part of a tropical marine environment, positioned closer to the southern margin of the Tethys Ocean. The depositional environment consisted of warm, shallow seas teeming with ammonites, belemnites, fish, and marine reptiles. The Albian is a key stage in Cretaceous geology, notable for evolutionary diversification and widespread dispersal of ammonite species. Fossils from this stage provide valuable insights into the palaeoecology and stratigraphy of the Early Cretaceous world. Species Overview – Deshayesites deshayesi Deshayesites deshayesi belongs to the Order Ammonitida, Superfamily Deshayesitoidea, and Family Deshayesitidae. It is the type species of the genus Deshayesites, making it an important reference fossil for palaeontologists. This species is frequently used as an index fossil for the early Albian, as its distribution helps geologists correlate rock layers across distant regions. Notable morphological features include: Planispiral shell coiling with moderately involute whorls. Prominent ribbing across the flanks, often bifurcating near the ventrolateral margin. Narrow venter with ribs curving gracefully around the outer shell. Occasional preservation of nacreous layers, producing the iridescence so highly prized by collectors. The combination of its distinct ribbing pattern and evolutionary importance makes Deshayesites deshayesi one of the most recognisable ammonites of the Lower Albian. Scientific and Collecting Importance This ammonite is highly significant in both scientific and collector circles. In geology, Deshayesites deshayesi defines the Deshayesites deshayesi Biozone, a key biostratigraphic marker for the Lower Albian stage. Its widespread occurrence across Europe, North Africa, and Madagascar highlights its importance for stratigraphic correlation. For collectors, specimens with natural iridescence are particularly sought after. The shimmering play of colours is caused by ancient aragonite layers, which have survived the fossilisation process. This rare combination of beauty and scientific value ensures that pieces such as this are treasured additions to any serious fossil collection. Provenance and Classification Species: Deshayesites deshayesi Order: Ammonitida Superfamily: Deshayesitoidea Family: Deshayesitidae Age: Lower Albian, Early Cretaceous (~113 million years ago) Locality: Madagascar A Unique Collector’s Fossil This Deshayesites deshayesi ammonite fossil from Madagascar is an exquisite specimen, combining the shimmering iridescence of preserved nacre with the historical importance of one of the Early Cretaceous’ most iconic ammonites. Whether acquired for its scientific significance or its natural beauty, this fossil represents a rare opportunity to own a genuine piece of deep geological history, preserved for over 100 million years and now available to treasure in your collection. Supplied with a Certificate of Authenticity, this is a specimen of enduring value and rarity.