HYPOPHYLLOCERAS ononense Fossil Ammonite, Hauterivian Stage, Cretaceous Madagascar | Authentic Specimen + COA
HYPOPHYLLOCERAS ononense Fossil Ammonite – Hauterivian Stage, Early Cretaceous Period, Madagascar
A rare and elegant fossil ammonite from the Early Cretaceous seas of Madagascar, this specimen of Hypophylloceras ononense is a stunning example of an extinct cephalopod that lived during the Hauterivian stage, around 132 to 129 million years ago. This piece offers exceptional preservation and intricate morphology, ideal for collectors and educational display.
Type: Invertebrate Fossil (Ammonite Shell)
Species: Hypophylloceras ononense
Described by: Yamani, 1954
Geological & Stratigraphic Details:
Formation: Likely from marine limestone beds of the Mahajanga Basin, Madagascar
Geological Stage: Hauterivian (Early Cretaceous)
Age: Approx. 132–129 million years ago
Depositional Environment: Marine shelf environment with fine calcareous sediments, ideal for the preservation of cephalopod shells
Biozone: Not formally assigned; part of a known ammonite-bearing horizon in Madagascar’s Cretaceous sequence
Morphology & Features: This specimen of Hypophylloceras ononense showcases beautiful features:
Highly involute shell with tightly coiled whorls and smooth flanks
Globular to compressed shell geometry with minimal ornamentation
Complex suture lines with elaborate lobes and saddles typical of phylloceratids
Preserved in brown to caramel fossil tones, sometimes with calcite infilling or polishing for aesthetic display
Notable: Hypophylloceras represents a lineage of ammonites known for their elegant, smooth shells and complex internal structures. The genus is often considered one of the more primitive members of the ammonite clade during the Cretaceous. Specimens from Madagascar are especially prized for their preservation and display quality.
Origin: Madagascar (likely Mahajanga Basin)
Species: Hypophylloceras ononense
Fossil Type: Ammonite Shell (Invertebrate)
Geological Stage: Hauterivian, Early Cretaceous
Size Reference: Scale rule square = 1cm (see photo for full sizing)
Note: The fossil in the photo is the exact specimen you will receive
Authenticity & Quality: All our fossils are 100% authentic and carefully hand-selected. This specimen is accompanied by a Certificate of Authenticity and has not been artificially enhanced or reconstructed.
Why Choose This Fossil? This is a premium-quality ammonite ideal for:
Collectors of rare Cretaceous ammonites
Teaching or educational use in palaeontology
Decorative natural history displays
Unique gifts for fossil lovers or science enthusiasts
Shipping & Packaging: Your fossil will be securely packaged with environmentally conscious materials. We offer fast, reliable shipping and expert handling to ensure safe delivery.
Add a remarkable relic of ancient ocean life to your collection with this beautiful Hypophylloceras ononense ammonite fossil from Madagascar.
All of our Fossils are 100% Genuine Specimens & come with a Certificate of Authenticity.
