Rare Crioceratites Heteromorph Fossil Ammonite Hauterivian Cretaceous Drome France Authentic Collector Specimen with COA

Description

This listing features a rare fossil ammonite, Crioceratites, a remarkable heteromorph ammonite from the Hauterivian stage of the Early Cretaceous (approximately 132–129 million years ago). The specimen comes from the Drôme region of southeastern France, an area celebrated for its exceptionally preserved ammonites. Unlike standard planispiral ammonites, Crioceratites exhibits an unusual heteromorph coiling, making it a highly distinctive and collectible fossil. The specimen shown in the photographs is the exact fossil you will receive, with scale rule squares / cube = 1 cm for accurate sizing. All our fossils are 100% genuine specimens and include a Certificate of Authenticity.

Geological Context: Hauterivian, Early Cretaceous

The Hauterivian stage represents an important subdivision of the Early Cretaceous. During this time, much of what is now southern France was submerged under warm epicontinental seas connected to the Tethys Ocean. The marine environment was rich in life, with ammonites evolving rapidly and diversifying into many unique forms.

Sedimentary layers of limestone, marl, and clay in the Drôme region preserve these ammonites in excellent detail, allowing paleontologists to study their evolution. Crioceratites fossils serve as index fossils for the Hauterivian, enabling precise dating and correlation of marine deposits across Europe.

The Species: Crioceratites

Crioceratites belongs to the order Ammonitida, superfamily Ancylocerataceae, and family Ancyloceratidae. It is part of the heteromorph ammonites, which are distinguished by their loosely coiled, crioconic shells. Instead of forming tight spirals, the whorls are open and separated, creating a dramatic and unusual appearance.

The ribbing on the shell is typically strong and pronounced, running across the flanks and providing both structural reinforcement and striking ornamentation. This morphology is one of the key features used by paleontologists to identify the genus. The unusual coiling of heteromorphs such as Crioceratites suggests a different ecological lifestyle, possibly drifting or hovering in the water column rather than swimming actively like their tightly coiled relatives.

Morphological and Scientific Features

• Order: Ammonitida
• Superfamily: Ancylocerataceae
• Family: Ancyloceratidae
• Genus: Crioceratites
• Geological Stage: Hauterivian, Early Cretaceous (c. 132–129 Ma)
• Locality: Drôme, France
• Shell Traits: Loosely coiled crioconic form, strong ribbing, distinctive open whorls
• Scientific Importance: Index fossil for Hauterivian deposits, valuable for evolutionary and stratigraphic studies

These features highlight Crioceratites as both a visually striking fossil and a scientifically significant specimen.

Collector and Display Value

Heteromorph ammonites are considerably rarer than planispiral ammonites, and Crioceratites is one of the most iconic examples. Its distinctive open coiling and strong ribbing make it highly prized among collectors and fossil enthusiasts.

The provenance from the Drôme region of France enhances its value, as this locality is internationally recognised for the quality and abundance of its Early Cretaceous ammonites. Fossils from this area are sought after by both private collectors and research institutions.

Every specimen is carefully selected for its authenticity and preservation. This Crioceratites ammonite is supplied with a Certificate of Authenticity, guaranteeing its genuine nature and provenance. A rare opportunity to own a distinctive heteromorph ammonite from the Hauterivian seas of France, this specimen is both a scientifically important fossil and an impressive display piece.