Ammonite Half Fossil Cretaceous Madagascar Genuine Polished Specimen Natural Prehistoric Cephalopod Display Piece with Certificate

Ammonite Half Fossil – Cretaceous Specimen from Madagascar

This genuine Ammonite Half fossil from Madagascar is a beautiful prehistoric marine specimen dating back to the Cretaceous Period, approximately 66–145 million years ago. Ammonites were extinct cephalopods related to modern squid and nautilus, and their coiled shells are among the most iconic fossils in the world.

This specimen has been carefully prepared as a half ammonite, revealing internal structure and natural chamber detail. The photograph shows the exact fossil you will receive. Each piece is individually chosen for preservation quality, visual appeal, and display character. Full sizing can be confirmed in the listing photographs.

This fossil is a genuine specimen and includes a Certificate of Authenticity lifetime guarantee generic card.

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Fossil Type – Ancient Marine Cephalopod

Ammonites belong to the subclass Ammonoidea within the mollusc class Cephalopoda. They thrived in the world’s oceans for hundreds of millions of years before becoming extinct at the end of the Cretaceous.

Key palaeontological features of ammonites include:

• Planispiral coiled shell morphology

• Internal chambered structure used for buoyancy control

• Complex suture patterns where septa meet the outer shell wall

• Often preserved with mineral infill or recrystallisation

Half ammonite specimens are especially valued because they can expose the internal chambers (camerae) and septa, offering a fascinating cross-sectional view of the animal’s shell architecture.

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Geological Context – Cretaceous Madagascar Deposits

Madagascar is one of the world’s most famous sources of well-preserved ammonites from the Cretaceous marine strata. During this time, Madagascar was surrounded by warm tropical seas that supported abundant marine life, including ammonites, bivalves, fish, and marine reptiles.

Ammonite fossils from Madagascar are typically preserved in sedimentary limestone or marl deposits formed on ancient sea floors. Over millions of years, shells became buried and fossilised as minerals replaced the original aragonite shell material.

Depositional conditions often allowed:

• Excellent shell preservation

• Natural mineral infilling of chambers

• Strong contrast between fossil and matrix

• Preparation into polished halves for display

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Morphology & Display Features

This ammonite half specimen may show:

• Clear spiral whorl structure

• Visible chamber divisions within the shell

• Natural mineralisation within internal spaces

• Preserved ribbing or ornamentation on outer whorls

Ammonites are widely used as index fossils because different species evolved rapidly and are useful for dating marine rock layers. While the exact species is not specified here, the specimen represents classic Cretaceous ammonite morphology.

Half specimens are particularly popular for collectors because they combine natural fossil preservation with an educational view of internal shell anatomy.

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Collecting, Educational & Decorative Value

This genuine ammonite half fossil is ideal for:

• Fossil and natural history collections

• Cretaceous marine fossil displays

• Educational geology and palaeontology teaching

• Unique prehistoric decor pieces

• Gifts for fossil enthusiasts and collectors

Ammonites are among the most recognisable fossils worldwide, making them a timeless addition to any collection.

Each specimen from Madagascar is unique in its mineral patterns, chamber preservation, and shell detail, ensuring a one-of-a-kind piece of ancient marine history.

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Authenticity & Certificate Included

This is a genuine Cretaceous ammonite fossil half from Madagascar. The photograph shows the exact specimen you will receive, carefully selected for quality and display appeal.

Your purchase includes a Certificate of Authenticity lifetime guarantee generic card. Please refer to the listing photographs for full sizing and scale.

A stunning prehistoric cephalopod fossil from Madagascar’s ancient seas, this ammonite half specimen offers a remarkable connection to marine life from the age of dinosaurs.