Phymatoceras robustus Fossil Ammonite – Upper Toarcian, Jurassic – Fresnay, Calvados, France – Alice Purnell Collection

Description

This listing features a rare and scientifically important fossil ammonite of the species Phymatoceras robustus (historically referred to under the genus Denckmannia), dating to the Upper Toarcian stage of the Jurassic period, approximately 180 to 175 million years ago. This exceptional piece was discovered in Fresnay, Calvados, France, and is part of the prestigious Alice Purnell Collection, known for its carefully curated and museum-quality fossil specimens.

Phymatoceras robustus is a member of the family Dactylioceratidae, distinguished by its robust shell, pronounced ribbing, and strong, rounded whorls. These ammonites thrived in the marine ecosystems of the Early Jurassic and were likely free-swimming predators or scavengers that played a key role in the marine food chain.

This particular specimen shows well-preserved shell architecture, offering a stunning natural spiral and characteristic ornamentation. It makes a striking addition to any fossil collection, both for its scientific interest and display appeal.

Geological Context: The Upper Toarcian Stage represents a crucial interval within the Early Jurassic period marked by widespread marine transgression and faunal turnover. The region of Fresnay in Calvados, Normandy was once submerged beneath a shallow epicontinental sea that supported diverse marine life. Sedimentary deposits from this region are known for yielding high-quality ammonite specimens, making them a significant site for Jurassic palaeontology.

Key Details:

• Species: Phymatoceras robustus (formerly referred to as Denckmannia)
• Fossil Type: Extinct marine cephalopod
• Age: Upper Toarcian Stage, Early Jurassic (~180–175 million years ago)
• Location Found: Fresnay, Calvados, France
• Provenance: From the Alice Purnell Collection
• Condition: Excellent preservation with strong ribbing and whorl definition
• Authenticity: 100% genuine fossil, supplied with a Certificate of Authenticity
• Scale: See 1cm scale cube in photo for accurate sizing
• Photo: The exact specimen pictured is the one you will receive

Scientific & Display Value: Phymatoceras robustus is a notable species for its distinctive form and for its use in regional biostratigraphy. This fossil offers both educational and decorative value and its inclusion in the renowned Alice Purnell Collection ensures its authenticity and scientific importance. Ideal for collectors, educators, or natural history enthusiasts.

All of our Fossils are 100% Genuine Specimens & come with a Certificate of Authenticity.

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Own a beautifully preserved relic of Jurassic marine life with this authentic Phymatoceras robustus ammonite from the Upper Toarcian of Calvados, France.