Acanthopleuroceras mangenesti Ammonite Fossil Jurassic France Pliensbachian Rare Display Specimen Authentic Lower Jurassic France

Description

Rare Lower Jurassic Ammonite from Classic French Locality

This exceptional Acanthopleuroceras mangenesti ammonite fossil originates from Fresney-le-Puceux in France, a well-known locality for Lower Jurassic marine fossils. Dating to the Lower Pliensbachian stage, approximately 190–183 million years ago, this specimen represents a fascinating period in Earth’s history when shallow seas covered large parts of Europe. Carefully selected for its quality and natural detail, this ammonite offers both scientific interest and strong display appeal.

Geological Age and Depositional Environment

The Lower Pliensbachian forms part of the Early Jurassic epoch, a time characterised by warm climates and widespread epicontinental seas. The fossil-bearing sediments of northern France were deposited in calm, shallow marine conditions where fine muds and limestones accumulated over time. These environments supported a diverse marine ecosystem including ammonites, bivalves, and marine reptiles.

Fresney-le-Puceux is particularly noted for its fossil-rich strata, where periodic sedimentation and relatively low oxygen conditions allowed for excellent preservation. The ammonites from this region are often found within compact limestone layers, helping to retain fine morphological details over millions of years.

Species and Taxonomic Significance

Acanthopleuroceras mangenesti belongs to the order Ammonitida and is part of the family Amaltheidae, within the superfamily Eoderoceratoidea. This genus is characteristic of the Pliensbachian and plays an important role in biostratigraphy, acting as an index fossil for correlating Lower Jurassic rock sequences across Europe.

Members of the genus Acanthopleuroceras are known for their robust shells and distinctive ornamentation, reflecting evolutionary adaptations during a period of increasing ecological diversification among ammonites.

Morphology and Distinctive Features

This specimen displays the classic planispiral coiling associated with ammonites, with well-defined whorls and a strong, structured shell form. Acanthopleuroceras mangenesti is particularly noted for its pronounced ribbing and tuberculation. The ribs are bold and often radiate outward from the umbilicus, sometimes terminating in small nodes or spines along the flanks and ventrolateral margins.

The shell tends to be moderately evolute, allowing earlier whorls to remain partially visible. This creates a visually striking spiral pattern that enhances its display quality. The venter may show a subtle keel or ridge, adding to the structural complexity of the fossil.

These morphological features not only contribute to the ammonite’s aesthetic appeal but also reflect functional adaptations, possibly aiding in buoyancy control and hydrodynamic efficiency during life.

Authenticity and Presentation

This is a genuine fossil specimen, not a cast or reproduction. It has been carefully chosen to ensure quality, authenticity, and visual impact. The photograph provided shows the exact piece you will receive, offering complete transparency and confidence in your purchase.

The fossil includes a Certificate of Authenticity lifetime guarantee card, confirming its legitimacy and geological origin. This makes it a reliable and valuable addition to any fossil collection.

A Collectible Piece of Jurassic History

Ammonites from the Pliensbachian of France are highly regarded among collectors for their preservation and scientific relevance. Acanthopleuroceras mangenesti is a particularly attractive species due to its bold ornamentation and recognisable form.

This specimen represents a tangible connection to ancient marine ecosystems that existed nearly 190 million years ago. Its combination of geological significance, natural beauty, and authentic provenance makes it an उत्कृष्ट addition for collectors, educators, or anyone with an appreciation for Earth’s deep history.