Description
HOLCOPHYLLOCERAS Fossil Ammonite – Oxfordian Stage, Late Jurassic, Madagascar
This beautifully preserved Holcophylloceras fossil ammonite originates from the Oxfordian stage of the Late Jurassic Period, approximately 163.5 to 157.3 million years ago. Discovered in the fossiliferous marine limestones of Madagascar, this specimen represents a visually striking and scientifically valuable extinct marine cephalopod.
Fossil Type & Species:
- Type: Invertebrate Fossil (Ammonite Shell)
- Genus: Holcophylloceras
- Order: Ammonitida
- Suborder: Phylloceratina
- Superfamily: Phylloceratoidea
- Family: Phylloceratidae
- Geological Age: Oxfordian Stage, Late Jurassic
- Described by: Neumayr (1875)
Geological & Stratigraphic Details:
- Formation: Jurassic marine limestone deposits, Madagascar
- Location: Likely Mahajanga Basin or equivalent Jurassic marine platform
- Stage: Oxfordian (~163.5–157.3 million years ago)
- Depositional Environment: Shallow marine carbonate platform with fine sediments, ideal for fossil preservation
- Biozone: Oxfordian ammonite zones (exact zone not formally assigned)
Morphology & Features: This Holcophylloceras specimen is characterised by:
- Strongly involute, compressed shell with minimal ribbing
- Fine longitudinal ornamentation and intricate suture lines
- Highly symmetrical and smooth shell profile with a narrow umbilicus
- Coloration ranging from cream to caramel and deep brown depending on mineral content
- Often polished to reveal chamber structure and suture complexity for display
Notable: Holcophylloceras is a member of the Phylloceratina lineage, known for its elegant, smooth shells and highly complex suture patterns. It represents one of the more advanced Jurassic ammonites and is valued by collectors and palaeontologists for both scientific and aesthetic purposes.
Specimen Details:
- Origin: Madagascar
- Genus: Holcophylloceras
- Fossil Type: Ammonite Shell (Invertebrate)
- Geological Stage: Oxfordian, Late Jurassic
- Size Reference: Scale rule square = 1cm (see photos for accurate sizing)
- Note: The exact fossil shown in the photographs is the specimen you will receive
Authenticity & Quality: This fossil is 100% genuine and has been carefully sourced for quality and preservation. It comes with a Certificate of Authenticity. No restoration or artificial enhancement.
Why Choose This Fossil? This Holcophylloceras ammonite is ideal for:
- Serious fossil collectors
- Museum or academic display
- Education and teaching collections
- Decorative and scientific interest
Shipping & Packaging: Secure and eco-conscious packaging with fast, tracked shipping ensures your fossil arrives safely.
Add a refined and rare marine fossil to your collection with this Holcophylloceras ammonite from the Oxfordian seas of Jurassic Madagascar.
All of our Fossils are 100% Genuine Specimens & come with a Certificate of Authenticity.
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