RARE Romaniceras deverianum Ammonite Fossil Turonian Cretaceous Madagascar with Certificate

Description

Offered here is a rare Romaniceras (Romaniceras) deverianum ammonite fossil, originating from the world-renowned deposits of Madagascar and dating back to the Turonian stage of the Late Cretaceous (approximately 93–90 million years ago). This ammonite represents one of the most sought-after genera within the Acanthoceratidae family, recognised for its robust morphology and distinct ornamentation.

This is the exact specimen shown in the photographs, presented with a 1 cm scale cube for accurate sizing. Each fossil in our collection has been carefully selected and prepared to showcase its natural beauty and scientific value. As always, this ammonite is accompanied by a Certificate of Authenticity, guaranteeing it as a 100% genuine specimen.

Geological Context

This specimen originates from Turonian deposits of Cretaceous Madagascar, a region known for its spectacular ammonite preservation. During this time, Madagascar was part of the southern hemisphere’s warm, shallow tropical seas, positioned along the margins of the ancient Tethys Ocean.

The Turonian stage was marked by high global sea levels and widespread marine transgressions. Rich in plankton and invertebrates, these seas provided the perfect environment for ammonites to flourish. Fine sediments deposited in these calm waters allowed exceptional fossilisation, preserving intricate shell details that remain visible today.

Scientific Classification

• Phylum: Mollusca
• Class: Cephalopoda
• Order: Ammonitida
• Superfamily: Acanthoceratoidea
• Family: Acanthoceratidae
• Genus: Romaniceras
• Species: Romaniceras deverianum

As a member of the Acanthoceratidae, Romaniceras represents an important group of Late Cretaceous ammonites, valuable for both biostratigraphy and palaeontological study.

Morphology and Features

The Romaniceras deverianum ammonite is distinguished by:

• Strong ribbing and ornamentation across the shell surface, enhancing its striking appearance.
• Robust, inflated whorls, characteristic of the genus and giving the shell a powerful profile.
• Prominent tubercles and nodes along the ribs, often preserved with exquisite clarity.
• A complex suture line, typical of Cretaceous ammonites, adding scientific importance and aesthetic beauty.

These traits not only provide insight into the evolutionary adaptations of ammonites but also make this specimen a visually stunning fossil for collectors and display.

Paleoenvironment

This ammonite lived in the warm, shallow waters of the Tethys Ocean, which extended across vast parts of the globe during the Cretaceous. It would have been an active predator, feeding on smaller marine invertebrates and forming part of a rich and dynamic ecosystem that included other ammonites, molluscs, crustaceans, and early marine reptiles.

The fossil’s preservation within chalky limestone sediments reflects stable depositional conditions and oxygen-rich waters that supported exceptional biodiversity.

Collector and Display Value

This rare Madagascan ammonite fossil offers both scientific and aesthetic appeal. With its bold ornamentation, excellent preservation, and well-documented geological context, it is a prized specimen for collectors, educators, and enthusiasts.

• Locality: Madagascar
• Age: Turonian, Late Cretaceous (~93–90 million years ago)
• Fossil Type: Ammonite (Romaniceras deverianum)

A true collector’s fossil, perfect for display, study, or as a unique natural history piece. This ammonite brings the story of the ancient seas into your collection with authenticity and beauty.