Stephanoceras umbilicum Fossil Ammonite – Lower Bajocian, Jurassic – Calvados, France – Alice Purnell Collection

Description

This listing offers a beautifully preserved and rare Stephanoceras umbilicum fossil ammonite from the Lower Bajocian Stage of the Middle Jurassic Period, approximately 170 million years ago. This particular specimen originates from Calvados, Normandy, France, and is part of the renowned Alice Purnell Collection.

Stephanoceras umbilicum belongs to the family Stephanoceratidae, a group of ammonites known for their ornate and highly ribbed shells with prominent tubercles. These ammonites were fast-moving, nektonic carnivores that thrived in the shallow marine environments of the Jurassic seas.

The Lower Bajocian Stage is a subdivision of the Middle Jurassic, characterized by diverse and well-preserved marine fossil assemblages. In the region of Calvados, the sedimentary rocks consist predominantly of limestone and marl, which provided excellent conditions for the fossilisation of ammonites and other marine organisms.

This specimen of Stephanoceras umbilicum displays classic features of the species including a wide umbilicus, well-defined ribbing, and a coiled spiral structure that showcases the natural geometry of these extinct marine molluscs. A must-have for fossil enthusiasts, collectors, or educators seeking a genuine example of Jurassic marine life.

Item Details:

• Specimen: Stephanoceras umbilicum
• Fossil Type: Ammonite
• Age: Lower Bajocian, Middle Jurassic (~170 million years ago)
• Geological Context: Jurassic marine deposits
• Location Found: Calvados, France
• Provenance: Alice Purnell Collection
• Certificate of Authenticity: Included
• Scale Reference: Scale rule squares/cube = 1cm (see photo for full sizing)

ACTUAL AS SEEN: You will receive the exact specimen shown in the photographs. This fossil has been carefully chosen, hand-selected, and professionally photographed. While dimensions are recorded as accurately as possible, irregularities in shape may lead to minor variations. Colours may appear different depending on lighting or monitor/device settings.

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Add a museum-quality ammonite to your fossil collection with this stunning Stephanoceras umbilicum specimen from the Jurassic seas of Calvados.