Rare Eubrancoceras aegoceratoides Ammonite Fossil Albian Cretaceous Chulec Formation Machay Group Proya Peru Genuine

Description

Rare Eubrancoceras aegoceratoides Ammonite Fossil

This listing presents a rare Eubrancoceras aegoceratoides ammonite fossil, from the Chulec Formation of the Machay Group, dating to the Albian Stage of the Cretaceous period. It was collected in Proya, Peru, a location well known for producing distinctive Albian ammonites. This is a carefully chosen specimen, with the exact fossil pictured in the photographs. A 1 cm scale cube is included for size reference. As with all of our offerings, this piece is a 100% genuine specimen and comes complete with a Certificate of Authenticity.

Geological Age and Context

The fossil comes from the Albian Stage, approximately 113–100.5 million years ago, within the Lower Cretaceous. This was a time of significant global change, marked by high sea levels and widespread shallow marine environments across South America. The Chulec Formation, part of the Machay Group, is a well-documented Albian unit characterised by marine limestones and shales deposited in warm, shallow seas. These sediments have yielded a diverse assemblage of ammonites and other marine fossils, helping paleontologists reconstruct the paleoenvironment of Cretaceous Peru. Fossils like Eubrancoceras aegoceratoides are important for understanding the rich biodiversity of this time.

Taxonomy and Classification

Eubrancoceras aegoceratoides belongs to the genus Eubrancoceras, which is part of the family Brancoceratidae, superfamily Acanthoceratoidea, and order Ammonitida. The Brancoceratidae are a distinctive ammonite family of the Albian, known for their strongly ribbed shells and rapid evolutionary changes. These features make them highly valuable for stratigraphic work. Eubrancoceras is one of the key genera within this group, and aegoceratoides is a species often used in biostratigraphic zonation of Albian deposits.

Morphological Features

The shell of Eubrancoceras aegoceratoides is evolute, with whorls that are openly coiled and clearly visible. Its ribs are strong and persistent, radiating across the flanks and often terminating at the venter in a distinctive pattern. This ornamentation is diagnostic of the species and allows paleontologists to easily identify it. The ribbing also provided structural reinforcement for the shell, which may have aided survival in dynamic shallow marine environments. The specimen offered here preserves these features with clarity, showcasing the evolutionary adaptations that define the genus.

Scientific and Collector Importance

Ammonites such as Eubrancoceras aegoceratoides are vital to biostratigraphy, serving as excellent index fossils for the Albian Stage. Their relatively short stratigraphic ranges and distinctive morphology allow geologists to correlate marine deposits across South America and beyond. For collectors, a specimen from the Chulec Formation of Peru holds special significance due to its rarity and well-documented provenance. The combination of robust ornamentation, historical importance, and geographical uniqueness makes this ammonite a desirable addition to any fossil collection.

Provenance and Authenticity

This specimen originates from Proya, Peru, specifically from the Chulec Formation of the Machay Group, a classic Albian locality. Every fossil we sell is carefully selected for its quality and authenticity, and each comes with a Certificate of Authenticity for complete buyer assurance. Secure, professional packaging ensures safe delivery so that your fossil arrives in excellent condition.

This is a rare Eubrancoceras aegoceratoides ammonite fossil from the Albian Stage of the Cretaceous, collected in the Chulec Formation of Proya, Peru. A scientifically important and visually striking piece, it is an exceptional addition to any collection of ammonites, Cretaceous fossils, or natural history specimens.