Description
An extraordinary 6.5″ fossil ammonite of the species Perisphinctes (Dichotomoceras) antecedens, sourced from the renowned Jurassic deposits near Tulear, Madagascar. This specimen dates back to the Oxfordian stage of the Late Jurassic period and is characterised by its large size and well-defined ribbing—traits that make it a standout in any collection.
Perisphinctes antecedens belongs to the family Perisphinctidae, within the superfamily Perisphinctoidea and order Ammonitida. This specimen, associated with the subgenus Dichotomoceras, displays fine bifurcating ribs and a slightly evolute shell, providing classic examples of Oxfordian ammonite morphology.
Geological & Scientific Details:
- Species: Perisphinctes (Dichotomoceras) antecedens
- Phylum: Mollusca
- Class: Cephalopoda
- Subclass: Ammonoidea
- Order: Ammonitida
- Superfamily: Perisphinctoidea
- Family: Perisphinctidae
- Geological Stage: Oxfordian (Upper Jurassic)
- Age: ~163–157 million years ago
- Location: Tulear, Madagascar
- Depositional Environment: Shallow marine carbonate platform
- Morphology Features: Large size (6.5″), bifurcating ribs, evolute coiling, shell ornamentation typical of Dichotomoceras
- Notable: Excellent preservation and polish enhance morphological details
Why This Specimen Stands Out:
- Rare large ammonite with exceptional preservation
- Classic Oxfordian ammonite ideal for collectors and educational displays
- Beautifully polished for aesthetic and study purposes
- Supplied with Certificate of Authenticity
Scale Reference: Scale Rule Squares / Cube = 1cm – Please refer to the photo for full sizing. The image shows the exact specimen you will receive.
Shipping & Packaging:
- Securely packaged with professional care
- Tracked international shipping available
A striking fossil ammonite with scientific, historic, and display value—a genuine glimpse into the marine life of the Late Jurassic.
All of our Fossils are 100% Genuine Specimens & come with a Certificate of Authenticity.
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