Grayiceras blanfordi Ammonite Fossil Tithonian Stage Cretaceous Russia Genuine Certified

Description

Genuine Grayiceras blanfordi Ammonite Fossil from Russia

This superb Grayiceras (blanfordi) ammonite fossil originates from the rich fossil-bearing strata of Russia and dates back to the Tithonian stage of the Late Jurassic transitioning into the Early Cretaceous, approximately 152–145 million years ago. A fine, naturally preserved specimen, it represents the final evolutionary phases of Jurassic ammonites before the rise of the diverse Early Cretaceous faunas. The fossil photographed is the exact piece you will receive, with scale cube squares at 1 cm for precise sizing. Every specimen is carefully selected and comes with a Certificate of Authenticity, ensuring its genuine origin and scientific value.

Geological Age and Setting – Tithonian Stage

The Tithonian stage marks the closing chapter of the Jurassic period and is globally significant for its diverse ammonite assemblages. During this time, seas covering much of Russia were shallow epicontinental environments connected to the Tethys Ocean. These marine settings provided ideal conditions for the proliferation of ammonites such as Grayiceras. The sedimentary deposits where this specimen was found typically consist of marls and limestones, reflecting deposition in relatively calm marine waters that allowed excellent fossil preservation.

Scientific Classification

• Class: Cephalopoda
• Subclass: Ammonoidea
• Order: Ammonitida
• Superfamily: Perisphinctoidea
• Family: Haploceratidae
• Genus: Grayiceras
• Species: Grayiceras blanfordi

Ammonites of the Haploceratidae family are characterised by their moderately involute shells and streamlined morphology, making them key index fossils for the Tithonian stage. The genus Grayiceras is particularly notable for its biostratigraphic importance, helping paleontologists establish precise correlations across Jurassic-Cretaceous boundary sequences.

Morphology and Distinctive Traits

This specimen of Grayiceras blanfordi displays the classic features of the genus, with a compressed, planispiral shell and subtle ribbing across the flanks. The whorls are tightly coiled, producing a clean and balanced outline that is highly appealing to collectors. Sutural patterns, although often fine, are distinctively folded and complex, revealing the evolutionary sophistication of these cephalopods.

The streamlined morphology suggests that these ammonites were fast-moving nektonic predators, capable of maneuvering through open waters while preying on small crustaceans, mollusks, and plankton. The structure of the shell also reflects adaptations to varying water depths and ecological niches during the Tithonian seas.

Paleoenvironment and Evolutionary Significance

In the shallow marine shelf seas of what is now Russia, ammonites such as Grayiceras blanfordi thrived in ecosystems rich with marine life, from bivalves and gastropods to marine reptiles. Their widespread distribution and rapid evolutionary turnover make them vital in stratigraphy. Paleontologists use them to establish detailed time scales and to interpret paleoenvironmental changes at the Jurassic–Cretaceous transition.

The Tithonian period was a time of evolutionary experimentation among ammonites, and Grayiceras represents a lineage that bridged key changes in ammonite morphology. Their fossils are therefore valued not only for their beauty but also for their role in understanding how marine ecosystems adapted during this dynamic period of Earth’s history.

Collectible and Scientific Value

This Grayiceras blanfordi ammonite fossil is an exceptional specimen for both collectors and researchers. Its well-preserved structure, elegant coiling, and provenance from Russian Tithonian deposits make it a highly desirable piece of natural history. Collectors appreciate its aesthetic appeal and rarity, while its role as an important biostratigraphic fossil adds significant scientific value.

Owning this specimen offers a tangible connection to the closing chapter of the Jurassic seas—a fossil that has endured for more than 145 million years and continues to inspire curiosity and admiration today.