Fossils for Sale - High-quality BRITISH and WORLDWIDE Fossils. An impressive selection of fossils, including Ammonites, Trilobites, Belemnites, Fossil Fish, Fossil Shark Teeth, Fossilised Insects in Amber, Dinosaurs, and Reptiles. UK Fossils was formed in 1988 and collects and preps our own fossils in the heart of the Jurassic Coast, collecting fossils from Lyme Regis, Charmouth and Somerset. Our passion for fossils is reflected in our carefully curated collection, which includes some of the rarest and most unique specimens available.

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Iridescent caloceras johnstoni ammonite fossil – jurassic blue lias, watchet somerset uk – genuine british fossil with certificate

Iridescent caloceras johnstoni ammonite fossil – jurassic blue lias, watchet somerset uk – genuine british fossil with certificate

Original price was: £36.00.Current price is: £28.80.

This listing features a truly stunning iridescent fossil ammonite – Caloceras johnstoni, discovered in the Blue Lias Formation near Watchet, Somerset, UK. This specimen dates to the Early Jurassic Period, around 200 million years ago, and exhibits a rare and beautiful natural iridescent sheen across its shell.

Caloceras johnstoni is a species of extinct ammonite, a group of marine cephalopods closely related to modern octopuses and squid. These ancient creatures swam the shallow seas of what is now Britain, using jet propulsion to navigate while their coiled shells helped regulate buoyancy. The shells were divided into chambers, with the animal living in the outermost one.

This particular specimen is a premium example, exhibiting natural iridescence—a shimmering rainbow effect caused by light refracting through thin layers of aragonite in the shell. Such preservation is highly sought-after by collectors and can only occur under very specific geological conditions.

The fossil was carefully discovered by our own team members, Alister and Alison, on 29 September 2024, and has been expertly cleaned, prepped, and treated by Alison to bring out its finest detail and colour.

 

Item Details:

  • Name: Caloceras johnstoni
  • Type: Ammonite Fossil
  • Age: Early Jurassic Period
  • Geological Formation: Blue Lias Formation
  • Location Found: Watchet, Somerset, UK
  • Scale Reference: Scale cube = 1cm (please see photo for full sizing)
  • Certificate of Authenticity: Included

 

ACTUAL AS SEEN: The image shows the exact specimen you will receive. Each fossil is hand-selected and photographed to show its unique characteristics.

Please Note:

  • Some fossils may be propped for photography.
  • Colours may vary slightly due to lighting and monitor settings.
  • Measurements are approximate due to natural shapes.
  • Once this fossil is sold, the listing will be updated with a new item and images.

100% Genuine Fossil – Professionally Prepared – Certificate of Authenticity Included

(Actual as seen)

Only 1 left in stock

SKU: CF2998 Category:

Description

This listing features a truly stunning iridescent fossil ammonite – Caloceras johnstoni, discovered in the Blue Lias Formation near Watchet, Somerset, UK. This specimen dates to the Early Jurassic Period, around 200 million years ago, and exhibits a rare and beautiful natural iridescent sheen across its shell.

Caloceras johnstoni is a species of extinct ammonite, a group of marine cephalopods closely related to modern octopuses and squid. These ancient creatures swam the shallow seas of what is now Britain, using jet propulsion to navigate while their coiled shells helped regulate buoyancy. The shells were divided into chambers, with the animal living in the outermost one.

This particular specimen is a premium example, exhibiting natural iridescence—a shimmering rainbow effect caused by light refracting through thin layers of aragonite in the shell. Such preservation is highly sought-after by collectors and can only occur under very specific geological conditions.

The fossil was carefully discovered by our own team members, Alister and Alison, on 29 September 2024, and has been expertly cleaned, prepped, and treated by Alison to bring out its finest detail and colour.

 

Item Details:

  • Name: Caloceras johnstoni
  • Type: Ammonite Fossil
  • Age: Early Jurassic Period
  • Geological Formation: Blue Lias Formation
  • Location Found: Watchet, Somerset, UK
  • Scale Reference: Scale cube = 1cm (please see photo for full sizing)
  • Certificate of Authenticity: Included

 

ACTUAL AS SEEN: The image shows the exact specimen you will receive. Each fossil is hand-selected and photographed to show its unique characteristics.

Please Note:

  • Some fossils may be propped for photography.
  • Colours may vary slightly due to lighting and monitor settings.
  • Measurements are approximate due to natural shapes.
  • Once this fossil is sold, the listing will be updated with a new item and images.

100% Genuine Fossil – Professionally Prepared – Certificate of Authenticity Included

Additional information

Era

Jurassic
Origin

United Kingdom

Jurassic Information

The Jurassic Period (201–145 million years ago) was the golden age of dinosaurs, with iconic species like Brachiosaurus, Stegosaurus, and Allosaurus dominating the land. It was a time of warm, humid climates, with high sea levels that created vast shallow seas, supporting abundant marine reptiles, ammonites, and early coral reefs. The first birds, such as Archaeopteryx, evolved from small theropod dinosaurs, while early mammals remained small and nocturnal. Lush forests of cycads, conifers, and ferns covered the land, providing food for giant herbivores. The breakup of the supercontinent Pangaea accelerated, shaping Earth's geography and setting the stage for the diverse ecosystems of the Cretaceous.

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