Large fossil block with ammonites and a nautiloid – Madagascar - Height: 635 mm - Width: 435 mm- 40.2 kg

A natural Cretaceous sculpture in its original matrix. This large fossil block is an extraordinary example of the natural aggregation of ammonites and nautiloids preserved within their original matrix. It is a find rich in species: a true section of a seabed from about 100 million years ago, transformed into rock through fossilization processes. An intact fossil community preserved for millions of years, most of the specimens in the block belong to the genus Cleoniceras, one of the most iconic ammonites of the Middle Cretaceous from Madagascar. Their shells, once polished, reveal the complex dendritic suture lines, which here appear in an exceptionally intricate form: very thin branches that resemble plant motifs or organic patterns, but in reality represent the junctions between the internal septa of the shell. Next to the Cleoniceras, a large Cymatoceras nautiloid stands out, contrasting sharply with the ammonites; the nautiloid has a simpler, more massive structure, with a smooth suture and less articulated internal chambers.