Exact Specimen ShownAmmonites
·Real Fossil
Eotetragonites umbilicostriatus Ammonite - Madagascar - 65g
- Real Fossil
- 110 million years
- Ships worldwide
£29.99
● Currently sold out
An authentic 110-million-year-old Eotetragonites umbilicostriatus ammonite from Madagascar, featuring a natural shell surface and subtle iridescence.
Sold out
Specimen Record
DTF-0D4BE820Exact specimen
The photographs show the exact item you will receive.
- Species
- Eotetragonites umbilicostriatus
- Identification confidence
- Not recorded
- Age
- 110 million years
- Geological period
- Lower Cretaceous (Albian)
- Formation
- Not recorded
- Locality
- Mahajanga, Madagascar
- Dimensions
- Not recorded
- Weight
- Not recorded
Condition & Treatment
- Repair
- Not recorded
- Restoration
- Not recorded
- Stabilisation
- Not recorded
- Polishing
- Not recorded
- Composite
- Not recorded
"Not recorded" means we hold no verified record for that detail — it is not a claim either way.
Curator Note
Unlike common polished ammonites, this specimen is preserved with its natural shell surface mostly intact, retaining its original taxonomic diagnostic features. The open umbilicus, visible coiling, and distinct curved constrictions make it a highly desirable piece for collectors who value scientific accuracy and historical integrity over artificial enhancement.
At a Glance
Type
Genuine fossil
Display
Compact and hand-sized; displays beautifully on a small specimen stand.
About This Fossil
An authentic specimen of the ammonite Eotetragonites umbilicostriatus, sourced from the renowned Cretaceous deposits of Mahajanga, Madagascar. Dating back to the Albian stage of the Lower Cretaceous, approximately 110 million years ago, this hand-sized specimen showcases a naturally preserved shell surface rather than a polished finish. It exhibits a beautiful range of dark grey-brown to charcoal tones, accented by subtle areas of natural pearly iridescence that catch the light when rotated.
This specific piece is characterised by an exceptionally clear, open central umbilicus and distinct curved constrictions that sweep across its outer whorl. Measuring just over 5 cm at its widest point and weighing 65 grams, it is a tactile, highly detailed representative of Cretaceous marine life. The item photographed is the exact, singular specimen you will receive, preserving all its original geological character. As with all genuine fossils, minor surface wear, natural mineralisation, and tiny organic irregularities are present, serving as a testament to its ancient history and authenticity.
Formation & Preservation
During the Albian stage of the Cretaceous Period, the region now known as Mahajanga, Madagascar, lay beneath a warm, shallow epicontinental sea. When these cephalopods died, their shells sank into the soft, oxygen-poor sediment of the seabed. Over millions of years, fine silts and muds compressed the shells, protecting them from scavenging and erosion. Dissolved minerals gradually permeated the hollow chambers of the shell, preserving the mineralised structure with exceptional fidelity and leaving portions of the original aragonite shell intact to produce a subtle pearly lustre.
What Makes This Specimen Special
Unlike common polished ammonites, this specimen is preserved with its natural shell surface mostly intact, retaining its original taxonomic diagnostic features. The open umbilicus, visible coiling, and distinct curved constrictions make it a highly desirable piece for collectors who value scientific accuracy and historical integrity over artificial enhancement.
Authenticity & Sourcing
Real vs Replica
- This is a genuine fossil — not a replica unless clearly stated. Clearly described and honestly presented.
- You will receive the exact fossil shown in the photographs.
Ethical Sourcing
- Sourced from established suppliers and known commercial sites. We do not buy from localities we know to be protected, scientifically restricted, or subject to export controls. Origin and sourcing information is shared where known.
- ✓We will not knowingly handle specimens removed in breach of any country's heritage or export laws.
Origin & Natural Variation
Stated origin (Mahajanga, Madagascar) are based on supplier information and available geological references. Identification can vary in certainty — especially for fragments — so where exact locality cannot be independently verified, we describe the formation rather than a single quarry.
Fossils are natural objects. Expect minor variation in colour, surface texture, and matrix, mineralisation and surface detail. Treatment information is shown under Condition & Treatment where it is recorded. “Not recorded” means we hold no verified record for that detail; it is not a claim that no treatment occurred.
Read our full authenticity & honest descriptions policy or the authenticity & sourcing clause in our terms.
Shipping, Returns & Packaging
• UK shipping: Free on orders of £50 or more. Standard £4.95 (Royal Mail Tracked 48, typically 2–3 working days after dispatch).
• International: Available worldwide. Rates at checkout.
• Packaging: Individually wrapped, cushioned, and boxed. Fragile specimens receive extra protection.
• Dispatch: Within 2 working days (framed, mounted, or made-to-order pieces take 1 additional working day).
• Returns: 30-day returns. Contact us first. Item must be in original condition.
Common Questions
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