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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RARE 10.5" Proplanulites koenegi Fossil Ammonite – Jurassic Lower Callovian – Ashton Keynes, Wiltshire, UK – Authentic Collector Specimen
RARE 10.5" Proplanulites koenegi Fossil Ammonite – Jurassic Lower Callovian – Ashton Keynes, Wiltshire, UK – Authentic Collector Specimen - Image 2
RARE 10.5" Proplanulites koenegi Fossil Ammonite – Jurassic Lower Callovian – Ashton Keynes, Wiltshire, UK – Authentic Collector Specimen - Image 3

RARE 10.5″ Proplanulites koenegi Fossil Ammonite – Jurassic Lower Callovian – Ashton Keynes, Wiltshire, UK – Authentic Collector Specimen

Original price was: £600.00.Current price is: £540.00.

This is a truly RARE 10.5-inch Proplanulites koenegi fossil ammonite, collected from Ashton Keynes, Wiltshire, UK, and dating back to the Lower Callovian stage of the Jurassic period, approximately 165 to 161 million years ago. This exceptional specimen is part of the prestigious Alice Purnell Collection, and is a striking addition to any advanced palaeontological or natural history collection.

The Proplanulites genus is part of the Ammonitida order, known for their smooth, planispiral shells. This particular specimen, Proplanulites koenegi, is a large and remarkably well-preserved example, showcasing the gentle whorls and subtle ornamentation characteristic of the species. Its size and preservation make it a true collector’s piece.

Ammonites were extinct marine molluscs closely related to modern-day squid and octopuses. They thrived in Earth’s oceans from the Devonian through to the end of the Cretaceous period and are among the most iconic and widely recognised fossils due to their elegant spiral form. Their shells, often preserved in fine marine sediments, provide critical information about Jurassic marine environments and biostratigraphy.

This fossil was discovered in sedimentary rocks laid down during the Callovian, a stage known for rich marine fauna. The region of Ashton Keynes in Wiltshire is particularly noted for its Jurassic exposures, offering rare opportunities to recover such magnificent and sizeable specimens.

 

Item Details:

  • Specimen: Proplanulites koenegi (Ammonite)
  • Age: Lower Callovian Stage, Jurassic Period (c. 165–161 million years ago)
  • Location: Ashton Keynes, Wiltshire, United Kingdom
  • Size: 10.5 inches
  • Collection: From the Alice Purnell Collection
  • Scale Reference: Scale Rule/Cube = 1cm (please see photo)
  • Certificate of Authenticity: Included

 

ACTUAL AS SEEN: You will receive the exact specimen shown in the photos. Each fossil is individually hand-selected and photographed, ensuring accuracy and authenticity.

Measurements are provided to the best of our ability, though natural fossil irregularities may cause slight variances. Colours may appear slightly different depending on lighting or screen display settings.

Please note: Some fossils may be gently propped for photographic purposes only.

Once this specific specimen is sold, the listing will be updated with a new individual item and its own photos and sizing. For your own reference, we recommend saving or screenshotting the listing image at time of purchase.

 

Own a genuine piece of Britain’s Jurassic heritage with this rare and impressive 10.5″ Proplanulites koenegi ammonite—an extraordinary fossil that beautifully captures the ancient marine life of the Callovian seas.

(Actual as seen)

Includes a fully hand-signed Premium Certificate of Authenticity.

Only 1 left in stock

SKU: AF1100 Categories: ,

Description

This is a truly RARE 10.5-inch Proplanulites koenegi fossil ammonite, collected from Ashton Keynes, Wiltshire, UK, and dating back to the Lower Callovian stage of the Jurassic period, approximately 165 to 161 million years ago. This exceptional specimen is part of the prestigious Alice Purnell Collection, and is a striking addition to any advanced palaeontological or natural history collection.

The Proplanulites genus is part of the Ammonitida order, known for their smooth, planispiral shells. This particular specimen, Proplanulites koenegi, is a large and remarkably well-preserved example, showcasing the gentle whorls and subtle ornamentation characteristic of the species. Its size and preservation make it a true collector’s piece.

Ammonites were extinct marine molluscs closely related to modern-day squid and octopuses. They thrived in Earth’s oceans from the Devonian through to the end of the Cretaceous period and are among the most iconic and widely recognised fossils due to their elegant spiral form. Their shells, often preserved in fine marine sediments, provide critical information about Jurassic marine environments and biostratigraphy.

This fossil was discovered in sedimentary rocks laid down during the Callovian, a stage known for rich marine fauna. The region of Ashton Keynes in Wiltshire is particularly noted for its Jurassic exposures, offering rare opportunities to recover such magnificent and sizeable specimens.

 

Item Details:

  • Specimen: Proplanulites koenegi (Ammonite)
  • Age: Lower Callovian Stage, Jurassic Period (c. 165–161 million years ago)
  • Location: Ashton Keynes, Wiltshire, United Kingdom
  • Size: 10.5 inches
  • Collection: From the Alice Purnell Collection
  • Scale Reference: Scale Rule/Cube = 1cm (please see photo)
  • Certificate of Authenticity: Included

 

ACTUAL AS SEEN: You will receive the exact specimen shown in the photos. Each fossil is individually hand-selected and photographed, ensuring accuracy and authenticity.

Measurements are provided to the best of our ability, though natural fossil irregularities may cause slight variances. Colours may appear slightly different depending on lighting or screen display settings.

Please note: Some fossils may be gently propped for photographic purposes only.

Once this specific specimen is sold, the listing will be updated with a new individual item and its own photos and sizing. For your own reference, we recommend saving or screenshotting the listing image at time of purchase.

 

Own a genuine piece of Britain’s Jurassic heritage with this rare and impressive 10.5″ Proplanulites koenegi ammonite—an extraordinary fossil that beautifully captures the ancient marine life of the Callovian seas.

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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