Fossilized Sectioned Ammonite (Cleoniceras) with...

Valued preservation of the internal chambered structure and rich mineral crystallizations — This exceptional specimen consists of a fossilized ammonite of the genus Cleoniceras, sectioned and polished to reveal its magnificent internal structure. The identification of the genus Cleoniceras is supported by the typical complex sutures and the morphology of the shell, indicative of a cephalopod organism that lived during the Cretaceous period. The cross-section highlights the chambers (ballast/floatation chambers) separated by septa, a fundamental diagnostic element for the classification of these marine invertebrates. Visual analysis reveals an extraordinary fossilization with a rich variety of colors and textures. The internal chambers have been filled by secondary crystallizations of aragonite and calcite, ranging from honeyed and amber tones to translucent whites and pearly grays. The suture lines, once filled with sediment, are now delineated by a color contrast that enhances their intricate pattern. Small geodes studded with shiny microcrystals of calcite can also be observed inside some chambers, testifying to a highly complex and long-lasting secondary mineralization process. The origin of this specimen is Madagascar, a geologically renowned area for producing ammonites of exceptional quality and preservation. The formation context dates back to the Cretaceous period, an era roughly between 145 and 66 million years ago. During this period, Madagascar was part of an active marine environment conducive to the life of ammonites and their subsequent fossilization, often with permineralization processes that preserve internal details. The aesthetic quality of this lot is remarkable, especially for the perfect symmetry of the section and the glossy surface finish that maximizes color contrast and depth. The visibility of the internal chambers, with fine details, and the presence of multiple generations of aragonitic and calcitic crystallization make it a museum piece. The warm tones of brown and orange combined with white and gray create a harmonious and sophisticated visual impact. The state of conservation is excellent, with no signs of significant damage or invasive restorations. The two halves fit together perfectly, a testament to the precise cutting and polishing work performed. The surfaces are smooth and reflective, allowing a clear observation of the internal structures. The lot also includes the appropriate display supports, enabling the ammonite to be presented in an elegant and stable manner. From a collecting standpoint, an ammonite Cleoniceras cut and crystallized to this size and quality is highly sought after. Specimens showing such structural integrity and rich internal mineralization are considered top pieces for any fossil or mineral collection. This lot offers not only an opportunity for paleontological study but also a work of great aesthetic beauty, combining geological history with the refined art of nature. Its Malagasy origin, combined with the magnificence of its fossilization, makes it a piece of notable educational and display value."

估價:$617.45

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