Larcheria larchi Ammonite Fossil Jurassic Poitiers Deux Sevres France Genuine COA

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Larcheria larchi Ammonite Fossil Jurassic Poitiers Deux Sevres France Genuine COA

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Authentic Jurassic Fossil from France

This Larcheria larchi ammonite fossil is a genuine specimen from the Middle Oxfordian stage of the Late Jurassic, discovered in Poitiers, Deux-Sèvres, France. Carefully selected for its fine preservation and distinctive morphology, it represents an important ammonite species highly valued by both collectors and paleontologists. The photographs show the exact specimen you will receive, with a 1 cm scale cube included for precise size reference. Each fossil is supplied with a Certificate of Authenticity, confirming that it is 100% genuine.

Geological Age and Provenance

This fossil dates to the Middle Oxfordian stage of the Jurassic Period, approximately 160–157 million years ago. During this time, the region of modern-day Poitiers in western France was submerged beneath shallow seas connected to the Tethys Ocean. Fine sediments settled across the seabed, preserving ammonites and other marine organisms in remarkable detail. The deposits of Deux-Sèvres are particularly renowned for yielding high-quality Oxfordian ammonites, making them key localities for both scientific study and fossil collecting.

Species Identification and Classification

Larcheria larchi belongs to the class Cephalopoda, order Ammonitida, superfamily Perisphinctoidea, and family Perisphinctidae. Ammonites of this genus are characterised by their distinctive ribbing, moderately involute coiling, and ornamented shell structure. The species larchi is an important marker within Oxfordian ammonite faunas, contributing to the refinement of Jurassic biostratigraphy and providing valuable information about evolutionary patterns within the Perisphinctidae family.

Morphology and Distinctive Traits

This specimen displays the typical features of Larcheria larchi. Its shell is planispiral with moderately involute whorls, meaning the outer coils partially cover the inner ones. The ribbing is bold and regular, sweeping across the shell flanks with rhythmic precision. In some areas, ribs bifurcate (split), creating a branching pattern that adds to the shell’s ornamentation. The combination of symmetry, compressed whorls, and ribbing not only made the shell strong but also hydrodynamically efficient, aiding the ammonite in maintaining buoyancy within Jurassic seas. The aesthetic appeal of these features makes this ammonite particularly desirable to collectors.

Scientific and Stratigraphic Importance

As an Oxfordian ammonite, Larcheria larchi is a significant index fossil. Its restricted stratigraphic range allows geologists to date and correlate Jurassic rock layers with high precision. Specimens of this species contribute to the definition of ammonite biozones, which are used internationally in Jurassic stratigraphy. For paleontologists, fossils like this provide essential evidence of cephalopod evolution, paleoenvironmental conditions, and faunal distribution within the Tethyan marine realm. For collectors, it represents not only a striking display specimen but also a scientifically important piece of Earth’s history.

Condition and Presentation

This specimen has been professionally prepared to preserve its natural details, with ribbing, whorl structure, and shell ornamentation clearly visible. It has not been altered or artificially enhanced, ensuring that the fossil remains in its authentic state. The images show the exact ammonite you will receive, guaranteeing complete transparency and confidence in your purchase. Its well-preserved features make it both a visually impressive display piece and a specimen of scientific value.

Guarantee of Authenticity

All of our fossils are 100% genuine, responsibly sourced, and scientifically identified. Each specimen comes with a Certificate of Authenticity. This Larcheria larchi ammonite fossil from Poitiers, Deux-Sèvres, France, is a rare and scientifically significant example of Jurassic marine life, making it an excellent addition for fossil collectors, natural history enthusiasts, and educational displays.