This listing is for a stunning Kosmoceras jasoni ammonite fossil block from the Upper Oxford Clay, Callovian stage of the Jurassic period. This exceptional specimen was sourced from Manor Farm, Oxford, UK, a renowned fossil-rich location known for its well-preserved ammonites.

Species: Kosmoceras jasoni

Age: Approx. 165 million years old (Middle Jurassic, Callovian)

Origin: Manor Farm, Oxford, United Kingdom

Formation: Upper Oxford Clay

About Kosmoceras jasoni

Kosmoceras jasoni is a species of ammonite from the Callovian stage of the Jurassic period. These ammonites are characterized by their ornate ribbing, prominent tubercles (knobs), and distinctive coiling patterns. They belonged to the Kosmoceratidae family, an extinct group of cephalopods that thrived in ancient marine environments. These creatures were free-swimming, predatory mollusks related to modern squids, cuttlefish, and nautiluses.

Key Features

• 100% Genuine Fossil – No restorations, guaranteed authentic
• Beautiful Detail & Preservation – Crisp ribbing and well-defined features
• Historic & Scientific Value – A perfect specimen for collectors, educators, and enthusiasts
• Sourced from the Alice Purnell Collection – One of the world's most prestigious ammonite collections

Why Buy From Us?

• All fossils are carefully chosen for their quality and authenticity
• Each fossil comes with a Certificate of Authenticity
• The fossil you see is the fossil you receive
• Expert sourcing & handling – Fossils are cleaned, prepped, and treated professionally

Size Information

Scale rule squares = 1cm. Please refer to the photos for full sizing.

Ideal for Collectors and Enthusiasts

Whether you're an avid fossil collector, a science enthusiast, or looking for a unique natural history display piece, this Kosmoceras jasoni ammonite fossil block is a stunning addition to any collection.

Shipping & Packaging

We take great care in securely packaging all fossils to ensure safe delivery. Shipping options available worldwide.

Invest in Prehistoric History

Own a piece of Earth's ancient marine life with this remarkable Kosmoceras jasoni ammonite fossil. A timeless relic from the Jurassic seas.

Order now – this is a one-of-a-kind specimen.