Limestone ammonite fossil half – sliced jurassic marine cephalopod – somerset, uk – 100% genuine with certificate

Description

This listing features a genuine half-section of a sliced limestone ammonite fossil, originating from the Jurassic period and discovered in the renowned fossil-rich region of Somerset, United Kingdom. This specimen has been expertly cut to expose the stunning internal chambers that once formed the buoyancy-regulating structure of this extinct marine animal.

Ammonites are one of the most iconic and recognisable fossils in the world. With their beautifully coiled, spiral shells, they are frequently found in fossil collections and educational displays. Although they resemble modern snails in shape, ammonites were actually marine cephalopods—more closely related to modern octopuses, squid, and cuttlefish than to gastropods. Their coiled shells contained gas-filled chambers which enabled them to float and move efficiently through the warm Jurassic seas.

This specimen is a single polished half, offering a clear view of the complex interior architecture of the ammonite shell. The visible chambers demonstrate how this incredible prehistoric animal maintained buoyancy and controlled its movement within the water column.

Geological Context: This fossil comes from the Jurassic limestone deposits of Somerset, a region that was submerged under a shallow tropical sea around 190 to 170 million years ago. These conditions were perfect for preserving the remains of marine life, which became encased in sediment and gradually fossilised over millions of years.

Key Details:

• Specimen: Limestone Ammonite Fossil (Half, Sliced)
• Fossil Type: Ammonite (extinct marine cephalopod)
• Age: Jurassic Period (~190–170 million years ago)
• Location Found: Somerset, United Kingdom
• Condition: Cut and polished to expose internal chamber structure
• Authenticity: 100% genuine specimen, supplied with a Certificate of Authenticity
• Scale: See 1cm cube in image for full sizing
• Photo: The image shows the exact specimen you will receive

ACTUAL AS SEEN: This fossil has been carefully hand-selected and photographed. Measurements are as accurate as possible, though fossil shapes may be irregular. Colour may vary depending on lighting conditions and screen settings. Once sold, the listing will be updated with a new specimen and image. We recommend saving a screenshot of your purchased item for reference upon delivery.

Educational Add-On – What is a Fossil? The word “fossil” once simply meant “something dug up.” Today, it refers to the preserved remains or trace evidence of prehistoric life. Fossils range from microscopic spores to gigantic dinosaur bones and form under specific conditions that slow decay and promote mineralisation.

How Fossils Form: Most fossils form when organisms are quickly buried under sediment—often from water sources such as rivers or seas. Over millions of years, pressure from overlying layers compacts the sediment into rock. The remains within may become replaced by minerals, forming a fossil.

Ideal Conditions for Fossilisation Include:

1. Rapid burial in moist sediment to prevent decay.
2. Burial in volcanic ash, which protects and preserves remains.
3. Presence of hard parts (shells, bones, teeth, or wood).
4. Stable environmental temperatures.
5. Groundwater rich in minerals.
6. Fine-grained sediments for delicate preservation.
7. Calm conditions to avoid disturbance and fragmentation.

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

Fast & Secure Shipping – Carefully packaged and tracked to ensure safe arrival.

Bring a genuine piece of ancient ocean history into your home with this beautiful Jurassic ammonite fossil half from Somerset, UK.