Pyritized Ammonite Pair. Speetoniceras versicolor. Lower Cretaceous. Volga River, Ulya...

Description

Pyritized Ammonite Pair
Speetoniceras versicolor
Lower Cretaceous
Volga River, Ulyanovsk Region, Russia

This exceptional fossil pair showcases a beautifully preserved Speetoniceras versicolor Ammonite from the Lower Cretaceous, transformed through natural pyritization-a rare process in which Iron Sulfide (Pyrite) replaces the original shell material. The result is a subtly sparkling golden sheen that enhances both the outer texture and internal structure. The specimen has been expertly halved and polished to a high luster, revealing the intricate spiral of chambered septa within. Each gleaming cross-section displays the complex internal geometry of this extinct marine cephalopod, with brilliant golden tones highlighting the natural mineralization. A fine and collectible example of fossil preservation and mineral transformation, ideal for both scientific display and aesthetic appreciation.
One Half Measurements: 11.02 x 10.43 x 1.18 inches (28.00 x 26.50 x 3.00 cm)

Provenance: Property of a Distinguished Southern California Collector

More Information: All items are offered "as is." While every effort has been made to accurately describe each lot, certain pieces—particularly fossils, minerals, and carvings—may exhibit minor imperfections, repairs, restorations, or natural wear consistent with age, excavation, or handling. Prospective buyers are encouraged to carefully review photographs and descriptions and to request additional condition information prior to bidding.


Estimate: $800 - up.

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