Rare Balaerites balaerense Heteromorph Fossil Ammonite Upper Hauterivian Cretaceous Alp Maritime France Authentic Collector Specimen

Description

This listing is for a rare fossil ammonite, Balaerites balaerense, a distinctive heteromorph ammonite from the Upper Hauterivian stage of the Early Cretaceous (approximately 130 million years ago). This specimen was collected in the Alpes-Maritimes region of France, an area world-renowned for its Early Cretaceous fossil deposits. Unlike the familiar tightly coiled ammonites, heteromorphs like Balaerites balaerense developed unusual, irregularly coiled shells that make them exceptionally striking. The fossil pictured is the exact specimen you will receive, photographed with a scale cube = 1 cm for accurate sizing. All of our fossils are 100% genuine specimens and come complete with a Certificate of Authenticity.

Geological Context: Upper Hauterivian, Early Cretaceous

The Hauterivian stage is part of the Early Cretaceous, a time of dynamic evolutionary change in ammonite lineages. The Upper Hauterivian in particular is marked by the diversification of heteromorph ammonites, whose unusual morphologies provide key insights into evolutionary experimentation within the group.

During this time, the Alpes-Maritimes area of southeastern France was submerged beneath warm, shallow seas on the margin of the Tethys Ocean. These seas deposited layers of limestone, marl, and clay that preserved a wealth of marine fossils. Ammonites from this stage, such as Balaerites balaerense, are considered important index fossils, enabling geologists to date and correlate Hauterivian rock sequences across Europe and beyond.

The Species: Balaerites balaerense

Balaerites balaerense belongs to the order Ammonitida, superfamily Ancylocerataceae, and family Ancyloceratidae. As a heteromorph ammonite, its shell deviates significantly from the standard planispiral form. Instead, Balaerites developed a more irregular and uncoiled design, often with complex curves and open whorls.

The shell of B. balaerense typically exhibits robust ribbing and tuberculate ornamentation, giving it a textured and visually distinctive appearance. These morphological traits make it immediately recognisable and highly desirable both to paleontologists and collectors. The unusual form suggests that Balaerites may have lived a different ecological lifestyle compared to its planispiral relatives—potentially hovering or drifting in the marine environment rather than actively swimming.

Morphological and Scientific Features

• Order: Ammonitida
• Superfamily: Ancylocerataceae
• Family: Ancyloceratidae
• Genus and Species: Balaerites balaerense
• Geological Stage: Upper Hauterivian, Early Cretaceous (c. 130 Ma)
• Locality: Alpes-Maritimes, France
• Shell Traits: Irregular heteromorph coiling, strong ribbing, tuberculate ornamentation
• Scientific Importance: Index fossil for Upper Hauterivian deposits, significant in studies of heteromorph ammonite evolution

Collector and Display Value

Heteromorph ammonites are far rarer than the standard coiled types, and Balaerites balaerense is a particularly scarce and visually impressive species. Its striking form and ribbed ornamentation make it both a scientifically valuable fossil and a dramatic display piece.

The provenance from the Alpes-Maritimes region of France enhances its appeal, as this area is renowned among collectors and paleontologists for producing some of the finest Hauterivian ammonite specimens in Europe.

All of our fossils are carefully selected for their authenticity and preservation. Supplied with a Certificate of Authenticity, this Balaerites balaerense heteromorph ammonite offers a rare opportunity to own a genuine specimen from the Early Cretaceous seas of France—a fascinating piece of natural history and an outstanding addition to any collection.