Massive Cleoniceras Ammonite Fossil Impressive Fossil - two Intersecting Spiral Chambers - Height: 505 mm - Width: 410 mm- 14000 g - (1)

Fossil Ammonite and Cretaceous Crystal Geometries — We present an exceptionally visually striking fossil specimen of an Ammonite with monumental dimensions. This specimen, belonging to the genus Cleoniceras, comes from the rich Madagascar deposits and dates to the Early Cretaceous, specifically the Albian stage, about 110 million years ago. The ammonite has been masterfully sectioned and polished to reveal its intricate internal structure, and is mounted on an elegant custom base with a swiveling support, allowing 360-degree viewing. The piece's composition is unique: not a single spiral, but an assembly showing two shell sections, creating a visual dialogue between two centers of logarithmic growth. This preparation highlights the perfect Fibonacci spiral geometry that governed the cephalopod shell's growth. The surface, mirror-polished, reveals a world of chromatic details. The internal chambers, or camerae, were filled with minerals during the fossilization process, giving rise to warm tones of orange, amber, and deep brown, probably due to calcite and aragonite. These vibrant colors create a magnificent contrast with the lighter rock matrix, in shades of gray and beige, that encloses the fossil. What makes this specimen scientifically fascinating and visually spectacular are the suture lines. These are not fractures, but the complex junctions between the septa (the walls dividing the internal chambers) and the outer shell wall. In this specimen, the sutures are of the ammonitic type, characterized by an extremely intricate and jagged pattern, with dendritic motifs reminiscent of ferns, corals, or crystallized lightning. This complexity is an evolutionary indicator, typical of the later ammonites of the Mesozoic. The permineralization fossilization process allowed each individual chamber, once filled with gas and liquids to regulate the animal's buoyancy, to be replaced molecule by molecule with mineral deposits, preserving the shape impeccably for millions of years. The preparation of a fossil of such size is an art that requires precision and sensitivity. The transverse section not only exposes the inner spiral but also creates a flat, glossy plane that acts as a window into deep time. The polishing enhances the translucency of the crystallized minerals inside the chambers and the complexity of the suture lines, turning a paleontological specimen into a natural work of art. The choice to create a composite piece with two spirals further increases its charm, offering a dynamic and unusual composition. This fossil is not only a record of prehistoric life but also an object of extraordinary decorative beauty. Its imposing size and warm colors make it an ideal focal point for any environment, from a professional study to a library, from an art gallery to a contemporary living room. As a collectible piece, it represents a valuable addition to any natural history collection or a modern Wunderkammer. The swiveling base is a functional detail that underscores its display value, allowing admiration of every detail, from the gleam of the polished surface to the rough texture of the outer matrix.
Technical details
Name: Fossil Ammonite (genus Cleoniceras)
Classification: Mollusca, Cephalopoda, Ammonoidea
Origin: Madagascar
Geological period: Early Cretaceous (Albian, about 110 million years ago)
Dimensions: 505 x 410 x 95 mm (refers to the fossil only)
Weight: 14,000 g (14 kg) (refers to the fossil only)
Base: Wooden base with swiveling metal support
Conditions: Natural specimen, sectioned and polished.