RARE 6.5″ Acanthoceras rhotomagense Fossil Chalk Ammonite – Lower Cenomanian, Cretaceous – Normandy, France – Alice Purnell Collection

Description

Offered here is a rare and highly detailed fossil ammonite of the species Acanthoceras rhotomagense from the Lower Cenomanian stage of the Late Cretaceous period, dating to approximately 100.5 to 98 million years ago. This impressive 6.5-inch fossil originates from the chalk-rich marine deposits of Normandy, France, and is part of the notable Alice Purnell Collection, which is recognised for its scientifically curated and display-worthy specimens.

Acanthoceras rhotomagense is a member of the Acanthoceratidae family, known for its large, ornate shell with strong ribbing and tuberculate (knobbed) ornamentation. These ammonites were active swimmers in the warm Cretaceous seas, using their chambered shells for buoyancy as they navigated complex marine ecosystems.

This specimen has been preserved within fine chalk matrix typical of the region, with prominent detail of the whorls, suture lines, and ribbing patterns clearly visible, making it ideal for collectors and educators alike.

Geological Context: The Lower Cenomanian Stage marks the beginning of the Late Cretaceous, a time of extensive chalk deposition due to high sea levels and prolific marine life. The Normandy coast in northern France is world-famous for its Cretaceous chalk cliffs and fossil content, especially ammonites which play an essential role in global stratigraphic correlation.

Key Details:

• Species: Acanthoceras rhotomagense (Fossil Ammonite)
• Fossil Type: Extinct marine cephalopod
• Age: Lower Cenomanian, Late Cretaceous (~100.5–98 million years ago)
• Location Found: Normandy, France
• Provenance: From the Alice Purnell Collection
• Size: Approx. 6.5 inches (see scale cube in photo for full dimensions)
• Condition: Excellent preservation with clear ribbing and chalk matrix
• Authenticity: Guaranteed 100% genuine, supplied with a Certificate of Authenticity
• Photo: The exact specimen pictured is the one you will receive

Scientific & Collector Value: Acanthoceras rhotomagense is a key species for biostratigraphy and palaeontology, serving as a zonal index fossil in many Cretaceous sequences. This beautifully preserved specimen from Normandy, paired with its trusted provenance from the Alice Purnell Collection, makes it an exceptional piece for collectors and researchers.

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

Fast & Secure Shipping – Carefully packed and promptly dispatched for safe and reliable delivery.

Own a remarkable example of Cretaceous marine life with this 6.5″ Acanthoceras rhotomagense fossil chalk ammonite from Normandy, France.