Rare Pachydiscus jacquoti Fossil Ammonite Maastrichtian Cretaceous S Limburg Netherlands COA

Description

Exceptional Pachydiscus jacquoti Ammonite Fossil from the Netherlands

This listing offers a rare Pachydiscus jacquoti ammonite fossil, dating from the Maastrichtian stage of the Late Cretaceous, approximately 72–66 million years ago. The specimen was recovered from South Limburg, Netherlands, a locality renowned for its fossil-rich chalk deposits that have yielded some of the most scientifically important ammonites from the very end of the Cretaceous period. This piece is carefully selected for its preservation, and the photos provided show the exact fossil you will receive. A 1 cm scale cube is included in the images for precise size reference.

Geological Setting – The Maastrichtian Stage

The Maastrichtian stage is the final stage of the Cretaceous period, directly preceding the Cretaceous–Paleogene extinction event. During this time, much of present-day Europe was submerged beneath shallow epicontinental seas. The chalk deposits of Limburg, from which this specimen originates, were laid down in these calm marine conditions, preserving an extraordinary record of marine life.

These chalk layers, often rich in microfossils, also entombed larger organisms such as ammonites. The preservation in fine-grained sediments has enabled specimens like Pachydiscus jacquoti to be found with remarkable detail.

Species Profile – Pachydiscus jacquoti

The genus Pachydiscus belongs to the family Pachydiscidae, within the order Ammonitida, and is known for its role as an important index fossil of the Upper Cretaceous. The species Pachydiscus jacquoti is especially prized due to its rarity and distinctive morphology.

Key morphological features include:

• Shell Coiling: Involute with relatively compressed whorls.
• Ribbing: Strong, straight or gently curved ribs crossing the flanks, which often bifurcate towards the outer shell.
• Ornamentation: Well-developed suture lines with complex lobes and saddles, reflecting its evolutionary advancement.
• Size Potential: Larger than many co-occurring ammonites, with some specimens reaching impressive diameters.

These features not only make Pachydiscus jacquoti visually striking but also crucial for paleontologists in understanding ammonite evolution and stratigraphy near the end of the Mesozoic era.

Scientific Importance and Biozonation

Ammonites such as Pachydiscus jacquoti are used extensively in biostratigraphy, allowing geologists to correlate chalk deposits across Europe. The presence of this species helps define certain biozones within the Maastrichtian, making it an invaluable tool for geological dating. Its occurrence in South Limburg contributes to the international recognition of the Maastrichtian type locality, which gives its name to the very last stage of the Cretaceous.

Collector and Display Value

This rare fossil ammonite represents not only a fascinating prehistoric organism but also a direct connection to the closing chapter of the Age of Dinosaurs. Its defined ribbing and overall symmetry make it an aesthetically appealing specimen for collectors, while its scientific context enhances its educational and historical significance. Whether for a dedicated fossil enthusiast, a natural history display, or an academic collection, this Pachydiscus jacquoti ammonite is a remarkable addition.

• Species: Pachydiscus jacquoti
• Family: Pachydiscidae
• Order: Ammonitida
• Age: Maastrichtian, Late Cretaceous (~72–66 million years ago)
• Locality: South Limburg, Netherlands
• Authenticity: Supplied with a Certificate of Authenticity

Authenticity Guaranteed

All of our fossils are 100% genuine specimens. This ammonite has been responsibly sourced and comes with a Certificate of Authenticity for your confidence. Every fossil we sell is carefully chosen, fully prepared, and presented with accurate details, ensuring that your purchase is both scientifically reliable and visually impressive.