Description Presenting a RARE 7″ specimen of Mantelliceras isovokyense, an iconic fossil ammonite from the Lower Cenomanian Stage of the Cretaceous Period, unearthed in Madagascar. This beautifully preserved example showcases the spiraled elegance and ribbed detailing characteristic of this extinct marine cephalopod. Geological Details: Locality: Madagascar Geological Period: Cretaceous Geological Stage: Lower Cenomanian (~100.5 to 93.9 million years ago) Depositional Environment: Epicontinental marine shelf — warm, shallow seas with fine carbonate-rich sedimentation Paleontological Classification: Order: Ammonitida Superfamily: Acanthoceratoidea Family: Acanthoceratidae Genus: Mantelliceras Species: isovokyense Biozone: Commonly found in the Mantelliceras mantelli Zone (Lower Cenomanian) Morphology & Notable Features: Planispiral coiling with pronounced, regularly spaced ribbing Smooth, involute shell with a compressed cross-section Distinguished by its moderate size and elegant symmetry Excellent aesthetic and scientific value — ideal for collectors and educators Scientific Note: Mantelliceras species, including M. isovokyense, are used as index fossils due to their widespread distribution and relatively short stratigraphic range. These features make this ammonite crucial for biostratigraphic correlation in the early Late Cretaceous. Authenticity & Presentation: 100% genuine fossil, not a replica Comes with a Certificate of Authenticity You will receive the exact specimen shown in the photographs Scale cube = 1cm is visible for accurate sizing Additional Information: This stunning ammonite specimen is a true window into the marine ecosystems of the mid-Cretaceous world. Its exceptional preservation and aesthetic appeal make it a perfect display piece, study fossil, or rare gift for any fossil enthusiast or natural history collector. All of our Fossils are 100% Genuine Specimens & come with a Certificate of Authenticity.
