Rare Barremites difficilis Ammonite Fossil from Barremian Cretaceous Castellane Provence France Authentic Specimen

Description

Geological Context and Provenance

This specimen is a genuine Barremites difficilis ammonite fossil from the Barremian Stage of the Early Cretaceous Period, approximately 129 – 125 million years ago. It originates from Castellane in Provence, southeastern France, a region celebrated for its outstanding Lower Cretaceous ammonite assemblages. The Provence localities are particularly important for defining the biostratigraphy of the Barremian and for preserving some of the most scientifically valuable ammonite species of the period.

During the Early Cretaceous, this area formed part of the shallow marine margins of the Tethys Ocean. Warm seas, rich in plankton and small marine organisms, provided the perfect environment for ammonites to flourish. Sediments of marl and limestone encapsulated their shells, creating fossils that remain well preserved to this day.

Fossil Type and Species Information

Barremites difficilis belongs to the Order Ammonitida, Superfamily Desmoceratoidea, and Family Desmoceratidae. The genus Barremites is one of the most characteristic ammonites of the Barremian Stage and gives its name to the geological interval itself. This makes Barremites fossils of special significance to both palaeontologists and collectors.

The species difficilis is notable for its moderately involute shell, well-defined ribbing, and distinctive whorl cross-section. These traits differentiate it from closely related ammonite taxa and allow it to serve as a useful index fossil within the Lower Cretaceous sequence. Its presence helps geologists correlate marine strata across different regions of Europe and beyond.

Morphological Features and Identification

This specimen shows the diagnostic ribbing pattern that defines Barremites difficilis. The ribs are typically straight and extend across the flanks to the venter, providing strength to the shell and a striking ornamental character. The whorls are compact and well coiled, with ribbing that gives the fossil a bold, sculptural appearance.

These morphological traits were functional as well as aesthetic, reinforcing the ammonite’s shell against water pressure and predators. The buoyancy chambers within the shell enabled Barremites to move efficiently through the water column, positioning it as an active predator within Early Cretaceous ecosystems.

Depositional Environment

The Castellane Provence deposits represent shallow marine conditions along the Tethyan margin. Fine-grained limestones and marls provided ideal conditions for fossilisation, preserving the ammonites in three-dimensional detail. These waters supported thriving communities of ammonites, belemnites, bivalves, gastropods, and marine reptiles, reflecting a diverse and vibrant ecosystem.

As an open-water cephalopod, Barremites difficilis would have played an important role in the food chain, preying on smaller invertebrates and serving as prey for larger marine reptiles. Its abundance and diversity during the Barremian make it one of the most important ammonites for understanding Early Cretaceous marine environments.

Collector Appeal and Authenticity

This rare Barremites difficilis fossil ammonite is not only scientifically significant but also visually impressive. Its ribbing, coiling, and provenance from Provence make it a standout specimen for collectors and natural history enthusiasts alike.

• 100% Genuine Specimen – All of our fossils are authentic and supplied with a Certificate of Authenticity.
• Exact Fossil Shown – The photographs provided are of the actual specimen you will receive.
• Scale Reference – Scale rule squares / cube = 1 cm. Please check photos for exact sizing.

Owning this ammonite offers a unique opportunity to connect with the Early Cretaceous seas of southern France. This carefully chosen Barremites difficilis fossil is both a scientific reference and a striking natural work of art, making it an exceptional addition to any fossil collection or educational display.