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

Description

This listing is for a rare fossil ammonite, Crioceratites loryi, a striking heteromorph ammonite from the Hauterivian stage of the Early Cretaceous (approximately 132–129 million years ago). Collected in the Drôme region of southeastern France, this specimen exemplifies the unusual morphology that makes heteromorph ammonites particularly sought after. The fossil shown in the photographs is the exact specimen you will receive. Scale rule squares / cube = 1 cm – please use the images for accurate size reference. All our fossils are 100% genuine and supplied with a Certificate of Authenticity.

Geological Context: Hauterivian, Early Cretaceous

The Hauterivian stage represents a vital subdivision of the Early Cretaceous, known for the diversification of ammonites into new and unusual forms. At this time, the Drôme region lay beneath warm shallow seas connected to the northern margin of the Tethys Ocean. These seas deposited layers of limestone, marl, and clay that now preserve an exceptional fossil record.

Ammonites from this stage, including Crioceratites loryi, serve as important index fossils, enabling geologists to date and correlate rock formations across Europe. Their distinctive morphology makes them valuable not only for scientific purposes but also for collectors who prize unusual natural specimens.

The Species: Crioceratites loryi

Crioceratites loryi belongs to the order Ammonitida, superfamily Ancylocerataceae, and family Ancyloceratidae. It is a classic example of a heteromorph ammonite—a group characterised by shells that deviate from the regular planispiral coiling of most ammonites.

The shell of C. loryi displays a loosely coiled crioconic form, with open whorls that do not touch each other. Its surface is marked by strong ribbing, a structural and ornamental feature that reinforced the shell and helped identify the species. Unlike tightly coiled ammonites, heteromorphs like Crioceratites loryi may have led a slower, drifting lifestyle, floating in the water column rather than swimming actively.

This evolutionary departure from the standard ammonite design highlights the adaptability of the group during the Early Cretaceous and provides paleontologists with vital insights into ammonite diversity.

Morphological and Scientific Features

• Order: Ammonitida
• Superfamily: Ancylocerataceae
• Family: Ancyloceratidae
• Genus and Species: Crioceratites loryi
• Geological Stage: Hauterivian, Early Cretaceous (c. 132–129 Ma)
• Locality: Drôme, France
• Shell Traits: Loosely coiled crioconic form, open whorls, strong ribbing across flanks
• Scientific Importance: Index fossil for Hauterivian deposits, important in evolutionary studies of heteromorph ammonites

Collector and Display Value

Heteromorph ammonites are much rarer than their planispiral relatives, and Crioceratites loryi is a particularly striking example. Its open coiling and bold ribbing give it an appearance unlike typical ammonites, making it highly desirable for both collectors and museums.

Provenance from the Drôme region of France adds further prestige, as this locality is internationally recognised for its Early Cretaceous fossil deposits. The rarity and distinctiveness of this specimen ensure that it stands out as a centrepiece in any collection.

All of our fossils are hand-selected for quality and authenticity. This specimen is supplied with a Certificate of Authenticity, making it a rare opportunity to own a genuine Crioceratites loryi heteromorph ammonite from the Early Cretaceous seas of France.