Rare Ptychophylloceras (Semisulcatoceras) ptychoicum Ammonite Fossil Berriasian Cretaceous Lacisterne Boisset Gard France

Description

Authentic Ptychophylloceras (Semisulcatoceras) ptychoicum Ammonite Fossil

This offering is a rare Ptychophylloceras (Semisulcatoceras) ptychoicum ammonite fossil, an outstanding specimen from the Berriasian Stage of the Early Cretaceous period. It originates from the highly regarded fossil beds of Lacisterne, Boisset, Gard, France, an area celebrated by paleontologists and collectors for producing exceptionally preserved ammonite faunas. The fossil shown in the photographs is the exact specimen you will receive, complete with its natural details captured beautifully. For scale, the cube in the photos represents 1 cm squares, with full dimensions visible in the provided images. Every fossil we supply is a 100% genuine specimen and comes with a Certificate of Authenticity, ensuring its scientific and collectible value.

Geological Context

The fossil dates to the Berriasian Stage, around 145 to 139 million years ago, which marks the very beginning of the Cretaceous System. This time period is geologically significant because it represents the transition from the Late Jurassic to the Early Cretaceous, a boundary recognized for evolutionary innovations among marine organisms. Ammonites like Ptychophylloceras ptychoicum flourished during this age, and their remains today provide essential insights into the biodiversity and paleoecology of the time. The Lacisterne locality has long been a reference site for Early Cretaceous ammonites and remains a highly sought-after source for rare species such as this.

Taxonomy and Classification

This specimen belongs to the genus Ptychophylloceras, within the subgenus Semisulcatoceras, and the species ptychoicum. It falls under the family Phylloceratidae, superfamily Phyllocerataceae, order Ammonitida. The Phylloceratidae are a distinctive lineage of ammonites characterized by their relatively smooth shells, subtle ribbing, and intricate suture lines. The genus Ptychophylloceras is particularly noted for its compressed, involute shells with finely ornamented surfaces, reflecting adaptations to open marine environments. The ptychoicum species exhibits the elegant and refined shell form typical of this group, making it a scientifically important and visually striking fossil.

Morphology and Diagnostic Features

The shell of Ptychophylloceras (Semisulcatoceras) ptychoicum is marked by its smooth, glossy appearance and gentle undulating ribbing. Unlike the heavily ribbed or tuberculated ammonites of other families, members of Phylloceratidae show a more streamlined, hydrodynamic form suited to deeper-water habitats. The intricate suture patterns, with complex lobes and saddles, are a hallmark of this family and serve as key identifiers for paleontologists. This specimen preserves these subtle yet defining traits, allowing close examination of its morphology. Collectors value such features highly, as they embody the refined elegance of phylloceratid ammonites.

Paleontological Importance

Ammonites of the genus Ptychophylloceras play an important role in biostratigraphy, as their stratigraphic ranges help define zones within the Lower Cretaceous. The Berriasian ammonite zones are fundamental for correlating rock layers across different regions of Europe and beyond. As such, this fossil is not only an attractive collector’s piece but also part of the broader scientific framework used to understand Earth’s deep history. Its presence in the well-documented Lacisterne beds enhances its scientific credibility and collectible significance.

Provenance and Authenticity

Collected from Lacisterne, Boisset, Gard, France, this fossil comes from one of Europe’s classic ammonite localities. It has been carefully selected for its preservation quality and accurate identification. Every specimen is accompanied by a Certificate of Authenticity, guaranteeing it as a genuine fossil and ensuring buyer confidence. Secure packaging and professional handling guarantee safe delivery.

This is a rare and scientifically valuable ammonite fossil from the dawn of the Cretaceous, offering both historical and aesthetic appeal. A perfect addition for collectors of ammonites, Cretaceous fossils, or anyone with a passion for paleontology.