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RARE Acompsoceras inconstans Fossil Chalk Ammonite – Cenomanian, Cretaceous – Cap Blanc, France – Alice Purnell Collection
RARE Acompsoceras inconstans Fossil Chalk Ammonite – Cenomanian, Cretaceous – Cap Blanc, France – Alice Purnell Collection - Image 2

RARE Acompsoceras inconstans Fossil Chalk Ammonite – Cenomanian, Cretaceous – Cap Blanc, France – Alice Purnell Collection

£36.00

Available here is a rare and beautifully preserved fossil ammonite of the species Acompsoceras inconstans from the Cenomanian stage of the Late Cretaceous period, dated to approximately 100.5 to 93.9 million years ago. This striking specimen was collected from Cap Blanc, France, and is part of the esteemed Alice Purnell Collection, known for its curated, scientifically significant fossil specimens.

Acompsoceras inconstans belonged to the family Acanthoceratidae and is easily recognised by its large, thick, and robust shell with distinctive ribbing. These ammonites were free-swimming marine cephalopods that roamed the warm epicontinental seas of the Cretaceous, using their chambered shells for buoyancy as they pursued prey in open water.

This fossil is a chalk ammonite, having been preserved in the fine calcareous deposits typical of the region, and offers fantastic detail of the coiling and rib structure.

Geological Context: The Cenomanian Stage marks the beginning of the Late Cretaceous and was a period characterised by globally high sea levels and widespread chalk deposition. The marine limestones and chalks of Cap Blanc, France, are renowned for their abundance and preservation of marine invertebrates, particularly ammonites. Fossils from this formation are important biostratigraphic markers for global correlation.

Key Details:

  • Species: Acompsoceras inconstans (Fossil Ammonite)
  • Fossil Type: Extinct marine cephalopod
  • Age: Cenomanian Stage, Late Cretaceous (~100.5–93.9 million years ago)
  • Location Found: Cap Blanc, France
  • Provenance: From the Alice Purnell Collection
  • Condition: Excellent preservation with clear ribbing and form in chalk matrix
  • Authenticity: 100% genuine specimen, provided with a Certificate of Authenticity
  • Scale: Please refer to the scale cube (1cm) shown in the photo for full sizing
  • Photo: The actual specimen shown is the one you will receive

Scientific & Collector Value: Acompsoceras inconstans is highly prized among ammonite enthusiasts due to its robust form and rarity in the fossil record. The chalk preservation enhances the visibility of fine shell details, making this specimen a stunning display item. Its association with the Alice Purnell Collection ensures authenticity and collector value.

All of our Fossils are 100% Genuine Specimens & come with a Certificate of Authenticity.

Fast & Secure Shipping – Carefully packaged and quickly dispatched for safe arrival.

Add a museum-quality specimen to your collection with this rare Acompsoceras inconstans fossil chalk ammonite from the Cenomanian of Cap Blanc, France.

(Actual as seen)

Out of stock

SKU: AF1126 Category:

Description

Available here is a rare and beautifully preserved fossil ammonite of the species Acompsoceras inconstans from the Cenomanian stage of the Late Cretaceous period, dated to approximately 100.5 to 93.9 million years ago. This striking specimen was collected from Cap Blanc, France, and is part of the esteemed Alice Purnell Collection, known for its curated, scientifically significant fossil specimens.

Acompsoceras inconstans belonged to the family Acanthoceratidae and is easily recognised by its large, thick, and robust shell with distinctive ribbing. These ammonites were free-swimming marine cephalopods that roamed the warm epicontinental seas of the Cretaceous, using their chambered shells for buoyancy as they pursued prey in open water.

This fossil is a chalk ammonite, having been preserved in the fine calcareous deposits typical of the region, and offers fantastic detail of the coiling and rib structure.

Geological Context: The Cenomanian Stage marks the beginning of the Late Cretaceous and was a period characterised by globally high sea levels and widespread chalk deposition. The marine limestones and chalks of Cap Blanc, France, are renowned for their abundance and preservation of marine invertebrates, particularly ammonites. Fossils from this formation are important biostratigraphic markers for global correlation.

Key Details:

  • Species: Acompsoceras inconstans (Fossil Ammonite)
  • Fossil Type: Extinct marine cephalopod
  • Age: Cenomanian Stage, Late Cretaceous (~100.5–93.9 million years ago)
  • Location Found: Cap Blanc, France
  • Provenance: From the Alice Purnell Collection
  • Condition: Excellent preservation with clear ribbing and form in chalk matrix
  • Authenticity: 100% genuine specimen, provided with a Certificate of Authenticity
  • Scale: Please refer to the scale cube (1cm) shown in the photo for full sizing
  • Photo: The actual specimen shown is the one you will receive

Scientific & Collector Value: Acompsoceras inconstans is highly prized among ammonite enthusiasts due to its robust form and rarity in the fossil record. The chalk preservation enhances the visibility of fine shell details, making this specimen a stunning display item. Its association with the Alice Purnell Collection ensures authenticity and collector value.

All of our Fossils are 100% Genuine Specimens & come with a Certificate of Authenticity.

Fast & Secure Shipping – Carefully packaged and quickly dispatched for safe arrival.

Add a museum-quality specimen to your collection with this rare Acompsoceras inconstans fossil chalk ammonite from the Cenomanian of Cap Blanc, France.

Additional information

Era

Cretaceous
Origin

France

Cretaceous Information

The Cretaceous Period (145–66 million years ago) was the final era of the Mesozoic, marked by the dominance of dinosaurs and the rise of flowering plants. It had a warm, greenhouse climate, with high sea levels that created vast shallow inland seas. Marine life flourished, including mosasaurs, ammonites, and rudist reefs, while the land was ruled by iconic dinosaurs like Tyrannosaurus rex, Triceratops, and Spinosaurus. Mammals and birds diversified, and insects thrived. The period ended with the mass extinction event, likely caused by an asteroid impact, wiping out the dinosaurs and paving the way for the rise of mammals in the Cenozoic.

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