Psiloceras johnstoni Ammonite Fossil | Toarcian, Jurassic | South Yorkshire UK | Alice Purnell Collection | Genuine with Certificate

Description

Fossil Type & Species:

This listing features a genuine ammonite fossil of Psiloceras johnstoni, an early Jurassic ammonite species of high scientific interest. This well-preserved fossil was discovered in South Yorkshire, United Kingdom, and comes from the esteemed Alice Purnell Collection, recognised for high-quality, well-documented British fossil specimens.

Geological Formation & Insight:

Psiloceras is one of the most important ammonite genera in biostratigraphy. While the genus is best known from the Hettangian stage (marking the start of the Jurassic), Psiloceras johnstoni is known to persist into younger intervals and represents early Toarcian evolutionary lineages.

This specimen was recovered from Toarcian-aged deposits, dating to approximately 183–180 million years ago, a time when marine environments across Britain were undergoing major changes. The sedimentary rocks of this age in South Yorkshire are part of the extensive Lower Jurassic sequence, typically made up of silts, shales, and mudstones deposited in shallow epicontinental seas.

Fossils from these layers are known for their exceptional preservation, especially ammonites, which are often found in nodules or fine-grained mudstones that retain ribbing, coiling, and even suture lines.

Item Specifics:

• Fossil Type: Ammonite
• Species: Psiloceras johnstoni
• Geological Age: Toarcian Stage, Lower Jurassic (~183–180 million years ago)
• Formation: Lower Jurassic marine deposits
• Locality: South Yorkshire, United Kingdom
• Provenance: From the Alice Purnell Collection
• Preservation: Excellent – showing smooth shell surface and coiling typical of Psiloceras
• Colour: Typically grey to brown fossil and matrix
• Size: Please refer to scale cube in the photo (each square = 1cm)
• Condition: 100% natural, no restoration
• Specimen: The exact item in the photo is the one you will receive

Authenticity Guarantee:

All of our Fossils are 100% Genuine Specimens & come with a Certificate of Authenticity. This ammonite has been professionally curated from the reputable Alice Purnell Collection, ensuring scientific integrity and historical value.

Shipping & Packaging:

Your fossil will be carefully packaged and shipped with full tracking. A highly collectible and educational specimen — ideal for fossil collectors, educators, paleontology enthusiasts, or as a unique natural history gift.

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