Douvilleiceras inaequinodum Ammonite Fossil Lower Albian Cretaceous Madagascar Genuine Specimen

Description

This listing presents a striking Douvilleiceras inaequinodum ammonite fossil from the Lower Albian stage of the Early Cretaceous Period, approximately 113–110 million years old. Collected from Madagascar, a region world-renowned for its superb ammonite preservation, this fossil is a wonderful combination of scientific importance and natural beauty. With its bold ribbing and distinctive shell morphology, it stands as a remarkable specimen for collectors and enthusiasts alike.

All of our fossils are 100% genuine specimens and are supplied with a Certificate of Authenticity. The exact ammonite shown in the photographs is the one you will receive, with a 1 cm scale cube and rule squares included to provide accurate size reference.

Geological Context and Age

This ammonite originates from the Lower Albian stage of the Early Cretaceous, a time when Madagascar was part of the southern margin of the ancient Tethys Ocean. The seas covering the island were warm, shallow, and teeming with life, creating perfect conditions for ammonites and other marine organisms to thrive.

The Cretaceous deposits of Madagascar are globally significant, not only for their diversity of ammonite species but also for the exceptional preservation of shell detail. Fossils like Douvilleiceras inaequinodum provide a valuable record of marine ecosystems that existed more than 110 million years ago, during a time of significant evolutionary diversification.

Morphology and Distinctive Features

Douvilleiceras inaequinodum belongs to the family Douvilleiceratidae, within the superfamily Desmoceratoidea of the order Ammonitida. This species is noted for its robust, evolute shell with strongly ornamented whorls. The most distinctive features are its thick, irregular ribs and nodular projections (tubercles), which give the shell a rugged, sculptured appearance.

The ribs sweep across the flanks and continue over the venter, enhancing the structural strength of the shell. These features were likely evolutionary adaptations, offering stability in open water and protection from predators. The ammonite’s complex sutures, visible where the shell chambers meet, also add to its visual appeal and scientific value.

Scientific Importance

Douvilleiceras inaequinodum is a key index fossil for the Lower Albian stage. Its easily recognisable morphology and wide geographic distribution make it an excellent tool for correlating Albian strata across different regions. Geologists and palaeontologists use this species to refine the biostratigraphic framework of the Early Cretaceous.

The genus Douvilleiceras also represents a critical point in ammonite evolution, showcasing the adaptation of heavily ribbed and tuberculate forms during the Early Cretaceous. This specimen therefore holds both stratigraphic and evolutionary significance, making it highly valuable for scientific study.

Collector and Display Value

This Douvilleiceras inaequinodum ammonite fossil from Madagascar is a superb addition to any collection. Its heavily ribbed and nodular shell makes it visually impressive, while its scientific role as a key index fossil enhances its prestige.

Collectors of ammonites, Cretaceous fossils, or Madagascan specimens will appreciate this piece for both its rarity and aesthetic value. It also makes an excellent educational specimen, allowing students and enthusiasts to explore the complexity of ammonite morphology and the diversity of life in the Early Cretaceous seas.

Your Guarantee of Authenticity

• 100% genuine Douvilleiceras inaequinodum ammonite fossil from Madagascar
• Geological age: Lower Albian stage, Early Cretaceous (approx. 113–110 million years old)
• Family: Douvilleiceratidae, Order: Ammonitida
• Robust shell with bold ribbing and distinctive nodules
• Supplied with a Certificate of Authenticity
• Exact specimen shown in photographs (not a stock image)
• Scale cube and rule squares = 1 cm (see images for precise sizing)

This Douvilleiceras inaequinodum ammonite fossil is an exceptional example of Madagascan Cretaceous palaeontology. With its authenticity guaranteed and its striking shell morphology, it is an outstanding addition to any fossil collection.