Description
Available now is a striking and genuine Aspidoceras spinosum fossil ammonite, collected from Sikili, Madagascar, and dating to the Kimmeridgian Stage of the Upper Jurassic Period. Known for its distinctive spines and ornate shell, this ammonite is both visually dramatic and scientifically important.
Taxonomic Classification:
- Genus: Aspidoceras
- Species: spinosum
- Order: Ammonitida
- Superfamily: Perisphinctoidea
- Family: Aspidoceratidae
- Originally described in the 19th century, Aspidoceras spinosum is famous for its bold ornamentation and wide stratigraphic range
Geological Context:
- Stage: Kimmeridgian (Upper Jurassic)
- Age: Approx. 157 to 152 million years ago
- Locality: Sikili, Madagascar
- Formation: Marine limestone and marl beds characteristic of Upper Jurassic shelf environments
- Depositional Environment: Warm, shallow marine carbonate platform within the southern Tethyan realm
- Biozone: Often associated with Aspidoceras acanthicum and Idoceras zones in regional Kimmeridgian stratigraphy
Morphological Features:
- Evolute shell with widely exposed whorls
- Thick, coarse ribbing across the flanks
- Prominent tubercles and spines on the ventrolateral margin
- Broad, rounded venter with minimal keel development
- Highly three-dimensional ornamentation, giving the fossil significant display value
Scientific & Collector Importance:
- Aspidoceras spinosum is a classic representative of Upper Jurassic ammonite faunas, noted for its robust ornamentation
- Used in ammonite biostratigraphy and faunal correlation across Tethyan regions
- Specimens from Madagascar are known for exceptional preservation and clarity of spine structures, making them ideal for collectors and educators
This listing includes photographs of the actual specimen you will receive, with a 1cm scale cube included for size reference. The piece has been carefully prepared to showcase its natural features.
Authenticity Guaranteed: All our fossils are 100% genuine natural specimens, and each comes with a Certificate of Authenticity. This is an excellent addition to any collection or display.
Please review the images for size and detail. A rare chance to acquire a visually striking and scientifically significant Aspidoceras spinosum ammonite fossil from Madagascar’s renowned Jurassic beds.
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