Rare Prolyelliceras prorsocurvatum Ammonite Fossil Albian Cretaceous Chulec Formation Machay Group Proya Peru Genuine

Description

Rare Prolyelliceras prorsocurvatum Ammonite Fossil

This listing presents a rare Prolyelliceras prorsocurvatum 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 site world-famous for producing exceptionally preserved ammonites from the Early Cretaceous. The photographs show the exact specimen you will receive, with a 1 cm scale cube included for sizing. As with all of our offerings, this is a 100% genuine fossil and is supplied with a Certificate of Authenticity.

Geological Age and Context

The Albian Stage (approximately 113–100.5 million years ago) is the final stage of the Early Cretaceous. During this time, high global sea levels created widespread shallow seas across South America, forming ideal habitats for ammonites and other marine organisms. The Chulec Formation, within the Machay Group, is a renowned fossil-bearing unit composed primarily of marine limestones and shales. These sediments accumulated in warm, shallow seas, preserving a rich assemblage of ammonites that are crucial for understanding the paleontology and stratigraphy of the Albian. Fossils like Prolyelliceras prorsocurvatum serve as important markers for reconstructing the history of these Cretaceous seas.

Taxonomy and Classification

Prolyelliceras prorsocurvatum is part of the genus Prolyelliceras, belonging to the family Lyelliceratidae, superfamily Acanthoceratoidea, and order Ammonitida. The Lyelliceratidae are a key family of Albian ammonites, recognised for their distinctive ribbing patterns and evolutionary role during this stage. Prolyelliceras is especially significant in biostratigraphy, as species like prorsocurvatum are used to define ammonite zones within the Albian Stage. This makes the fossil not only an attractive collector’s piece but also a scientifically valuable specimen.

Morphological Features

The shell of Prolyelliceras prorsocurvatum is compact and sturdy, with strongly ribbed whorls that radiate prominently across the flanks. The ribs often curve forward (hence the species name prorsocurvatum), giving the ammonite a unique and highly recognisable appearance. The venter (outer margin) is typically broad, with ribs continuing across it in a symmetrical pattern. These features are diagnostic of the species and serve as key identifiers in the field. The sculptured ornamentation not only adds to its aesthetic appeal but also reflects adaptations for survival in the dynamic Albian seas.

Scientific and Collector Importance

Ammonites like Prolyelliceras prorsocurvatum are vital for biostratigraphy, serving as zonal fossils for the Albian Stage. Their restricted time ranges and distinctive ribbing make them invaluable for correlating rock layers across South America and beyond. For collectors, specimens from the Chulec Formation of Peru are highly prized due to their rarity, excellent preservation, and historical significance in paleontological research. Owning such a fossil provides both a striking display piece and a scientifically important specimen that connects directly to the Early Cretaceous seas.

Provenance and Authenticity

This ammonite fossil comes from Proya, Peru, specifically the Chulec Formation of the Machay Group, a globally important Albian fossil locality. Every specimen we supply is carefully selected for its quality and authenticity, and each is accompanied by a Certificate of Authenticity. Professional packaging and secure delivery ensure that your fossil arrives safely and in excellent condition.

This is a rare Prolyelliceras prorsocurvatum ammonite fossil from the Albian of Peru. With its distinctive ribbing, scientific importance, and excellent provenance, it is a superb addition to any ammonite, Cretaceous fossil, or natural history collection.