Rare Anisoceras perarmatum Heteromorph Ammonite Fossil Cretaceous Upper Albian France Genuine Certified Specimen | Collector Fossil

Description

Authentic Anisoceras perarmatum Ammonite Fossil from France

This listing features a rare Anisoceras perarmatum heteromorph ammonite fossil from the Upper Albian Stage of the Cretaceous Period, approximately 105–100 million years old. It comes from the Hautes-Alpes region of France, a locality celebrated for its exceptional fossil preservation and scientific importance. Each fossil is 100% genuine, individually selected, and comes with a Certificate of Authenticity. The specimen pictured is the exact one you will receive, with a 1 cm scale cube included in the photos for size reference.

Geological Age and Depositional Environment

The Albian Stage is part of the Lower Cretaceous and represents a time of dynamic geological and biological change. The Upper Albian, in particular, was characterised by shallow marine seas teeming with ammonites, belemnites, and other marine life. The Hautes-Alpes exposures provide a rich fossil record from this stage, preserving ammonites in fine-grained sediments that capture exquisite detail. Specimens from this region allow collectors and researchers to study the biodiversity and evolutionary adaptations of ammonites in Cretaceous marine ecosystems.

Fossil Type and Classification

Ammonites belonged to the order Ammonitida, extinct cephalopods related to squid, cuttlefish, and octopus. The genus Anisoceras, and specifically the species Anisoceras perarmatum, is part of the family Anisoceratidae, within the superfamily Turrilitoidea. These ammonites are heteromorphs, meaning their shells deviated from the classic tightly coiled form, instead developing irregular, loosely coiled, or hook-like morphologies. Such features make heteromorph ammonites especially interesting, as they represent evolutionary experimentation in shell design during the Cretaceous.

Morphology and Distinctive Features

Anisoceras perarmatum is particularly recognisable for its unusual shell structure. Rather than forming a regular planispiral coil, its whorls are often loosely coiled, with strong ribbing and spines that give the shell a striking appearance. These features not only make it visually appealing to collectors but also important for scientific classification. The robust ornamentation and heteromorph coiling of Anisoceras may have affected its buoyancy and lifestyle, suggesting a different ecological niche compared to more typical ammonites. This makes each specimen a fascinating subject for study as well as a unique display fossil.

Scientific and Collector Importance

Heteromorph ammonites such as Anisoceras perarmatum are key index fossils for the Upper Albian biozones, making them valuable to geologists for dating and correlating rock strata across different regions. Their presence in fossiliferous deposits provides insight into the evolutionary diversity of ammonites just prior to the Cenomanian Stage of the Late Cretaceous. For collectors, a specimen of this rarity and quality from the Hautes-Alpes represents both a significant scientific specimen and a remarkable addition to any fossil collection. Its distinctive morphology ensures it stands out as a centrepiece display fossil.

Provenance and Authenticity

• Species: Anisoceras perarmatum
• Fossil Type: Heteromorph ammonite
• Geological Stage: Upper Albian, Cretaceous (~105–100 million years old)
• Location: Hautes-Alpes, France
• Family: Anisoceratidae
• Superfamily: Turrilitoidea
• Order: Ammonitida
• Notable Features: Heteromorph coiling, strong ribbing, spines, striking shell morphology
• Authenticity: 100% genuine fossil with Certificate of Authenticity
• Photographs: Exact specimen shown with 1 cm scale cube for reference

A Carefully Selected Fossil

This Anisoceras perarmatum heteromorph ammonite fossil has been carefully chosen for its preservation, scientific significance, and collector appeal. The fossil photographed is the actual piece you will receive, offering full transparency and assurance of authenticity. Every specimen is accompanied by a Certificate of Authenticity, making it suitable for serious collectors, educators, or anyone captivated by Earth’s ancient history.

This rare ammonite fossil from the Upper Albian of the Hautes-Alpes, France, represents a truly remarkable piece of natural history—an extraordinary collector’s item that captures both the beauty and evolutionary ingenuity of the Cretaceous seas.