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

Description

Rare Prolyelliceras prorsocurvatum Ammonite Fossil

This listing features a rare Prolyelliceras prorsocurvatum ammonite fossil, collected from the Chulec Formation, Machay Group, and dating to the Albian Stage of the Cretaceous period. Found in Proya, Peru, this specimen is a superb example of an Albian ammonite, showcasing the distinctive ribbed morphology typical of this species. The photographs display the exact specimen you will receive, with a 1 cm cube included for precise sizing. Every fossil we offer is a 100% genuine specimen and comes with a Certificate of Authenticity.

Geological Age and Context

The Albian Stage (approximately 113–100.5 million years ago) was the final stage of the Early Cretaceous. During this time, warm global climates and high sea levels created widespread shallow marine environments that supported diverse invertebrate life. The Chulec Formation, part of the Machay Group in Peru, is a highly fossiliferous unit composed of limestones and shales deposited in a shallow epicontinental sea connected to the Tethys Ocean. This formation is internationally recognised for its ammonite fauna, which has been critical in refining the Albian biostratigraphy of South America. Fossils from Proya are particularly significant, offering both scientific value and rarity in private collections.

Taxonomy and Classification

Prolyelliceras prorsocurvatum belongs to the genus Prolyelliceras, within the family Lyelliceratidae, superfamily Acanthoceratoidea, and order Ammonitida. Ammonites of this genus are characteristic of the Albian, and their well-defined shell features make them excellent biostratigraphic tools. The species prorsocurvatum is especially notable for its clear morphological traits and its restricted stratigraphic occurrence, which help paleontologists accurately date and correlate Albian rock sequences.

Morphological Features

The shell of Prolyelliceras prorsocurvatum is moderately involute, with later whorls partly covering earlier growth. Its most distinctive feature is the strong, forward-curving ribs that radiate across the flanks and extend cleanly over the venter. This forward sweep of the ribs gives the species its name, “prorsocurvatum,” meaning “curved forward.” The ribs are often bifurcated, adding to the bold sculptural effect. The robust, ribbed form of the shell not only strengthens its identification but also makes it an attractive display piece. This specimen retains these diagnostic features in excellent preservation, making it highly desirable for both study and collection.

Scientific and Collector Importance

Ammonites such as Prolyelliceras prorsocurvatum play an essential role in biostratigraphy, serving as key index fossils for the Albian Stage. Their distinct morphology and relatively narrow stratigraphic range allow geologists to correlate marine deposits across South America and beyond. For collectors, this fossil represents a rare opportunity to own a piece of paleontological history from Peru’s world-renowned Chulec Formation. Its rarity, combined with its scientific significance and striking ribbed structure, makes it an important addition to any serious collection of ammonites or Cretaceous fossils.

Provenance and Authenticity

This ammonite fossil originates from Proya, Peru, within the Chulec Formation of the Machay Group. Each specimen we offer is carefully selected for authenticity, preservation, and historical significance. Every piece is supplied with a Certificate of Authenticity, ensuring full confidence in its provenance. We also provide secure, professional packaging to guarantee your fossil arrives safely and in excellent condition.

This is a rare Prolyelliceras prorsocurvatum ammonite fossil from the Albian of Proya, Peru. With its distinctive ribbing, excellent preservation, and strong stratigraphic value, it is a superb addition to any collection of ammonites, Cretaceous fossils, or natural history specimens.