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 4.25" Catasigaloceras planicerclus Fossil Ammonite, Jurassic, Lower Callovian, Waterpark UK, Genuine with COA
Rare 4.25" Catasigaloceras planicerclus Fossil Ammonite, Jurassic, Lower Callovian, Waterpark UK, Genuine with COA - Image 2

Rare 4.25″ Catasigaloceras planicerclus Fossil Ammonite, Jurassic, Lower Callovian, Waterpark UK, Genuine with COA

£60.00

Available here is a Rare 4.25″ Fossil Ammonite of Catasigaloceras planicerclus from the Lower Callovian Stage of the Jurassic Period, found at Waterpark, Ashton Keynes, United Kingdom — a site renowned for its rich and scientifically important marine fossils.

The photographs show the exact specimen you will receive, carefully selected for its preservation, size, and scientific integrity.

Scale Rule Squares / Cube = 1cm — please refer to the photo for precise sizing.

 

Key Geological and Scientific Information:

  • Species: Catasigaloceras planicerclus
  • Fossil Type: Ammonite (extinct marine cephalopod)
  • Geological Period: Jurassic
  • Geological Stage: Lower Callovian (Middle Jurassic)
  • Location: Waterpark, Ashton Keynes, Wiltshire, England, UK
  • Formation: Likely Kellaways Beds (Callovian marine clay and silt)
  • Approximate Age: ~164 million years ago
  • Order: Ammonitida
  • Superfamily: Stephanoceratoidea
  • Family: Sigaloceratidae
  • Formally Described By: S.S. Buckman, early 20th century

 

Morphology Features: Catasigaloceras planicerclus is a distinctive ammonite known for its flattened, smooth-sided whorls with a relatively broad and planulate shell. The venter (outer edge) is typically narrow and may be subtly keeled or rounded depending on growth stage and preservation. This species generally exhibits fine ribbing or near-smooth ornamentation, contributing to its clean and elegant appearance. This specimen beautifully illustrates these features, making it an excellent representative of the genus.

 

Depositional Environment: The ammonite was preserved in offshore marine deposits, most likely from the Kellaways Beds, a layer of fine-grained clay and siltstones formed in a low-energy, shelf environment. These marine sediments were ideal for fossil preservation, especially for cephalopods.

 

Biozone & Stratigraphy: While not a zone-defining species itself, Catasigaloceras planicerclus is generally associated with the Calloviense Zone of the Lower Callovian, contributing to stratigraphic resolution and fossil correlation in southern England and adjacent European basins.

 

Scientific Importance: This species represents a refined evolutionary stage within the Sigaloceratidae family. It offers insight into the subtle morphological shifts in ammonite evolution during the Middle Jurassic and is valued both as a collector’s specimen and a reference fossil for biostratigraphic work.

 

Authenticity Guarantee: All of our fossils are 100% genuine specimens, carefully sourced and professionally handled. A Certificate of Authenticity is included with every fossil we sell, offering peace of mind and provenance.

 

This Catasigaloceras planicerclus ammonite is a beautiful and scientifically meaningful specimen — a rare and valuable addition to any fossil collection or Jurassic display.

(Actual as seen)

Only 1 left in stock

SKU: UF4423 Category:

Description

Available here is a Rare 4.25″ Fossil Ammonite of Catasigaloceras planicerclus from the Lower Callovian Stage of the Jurassic Period, found at Waterpark, Ashton Keynes, United Kingdom — a site renowned for its rich and scientifically important marine fossils.

The photographs show the exact specimen you will receive, carefully selected for its preservation, size, and scientific integrity.

Scale Rule Squares / Cube = 1cm — please refer to the photo for precise sizing.

 

Key Geological and Scientific Information:

  • Species: Catasigaloceras planicerclus
  • Fossil Type: Ammonite (extinct marine cephalopod)
  • Geological Period: Jurassic
  • Geological Stage: Lower Callovian (Middle Jurassic)
  • Location: Waterpark, Ashton Keynes, Wiltshire, England, UK
  • Formation: Likely Kellaways Beds (Callovian marine clay and silt)
  • Approximate Age: ~164 million years ago
  • Order: Ammonitida
  • Superfamily: Stephanoceratoidea
  • Family: Sigaloceratidae
  • Formally Described By: S.S. Buckman, early 20th century

 

Morphology Features: Catasigaloceras planicerclus is a distinctive ammonite known for its flattened, smooth-sided whorls with a relatively broad and planulate shell. The venter (outer edge) is typically narrow and may be subtly keeled or rounded depending on growth stage and preservation. This species generally exhibits fine ribbing or near-smooth ornamentation, contributing to its clean and elegant appearance. This specimen beautifully illustrates these features, making it an excellent representative of the genus.

 

Depositional Environment: The ammonite was preserved in offshore marine deposits, most likely from the Kellaways Beds, a layer of fine-grained clay and siltstones formed in a low-energy, shelf environment. These marine sediments were ideal for fossil preservation, especially for cephalopods.

 

Biozone & Stratigraphy: While not a zone-defining species itself, Catasigaloceras planicerclus is generally associated with the Calloviense Zone of the Lower Callovian, contributing to stratigraphic resolution and fossil correlation in southern England and adjacent European basins.

 

Scientific Importance: This species represents a refined evolutionary stage within the Sigaloceratidae family. It offers insight into the subtle morphological shifts in ammonite evolution during the Middle Jurassic and is valued both as a collector’s specimen and a reference fossil for biostratigraphic work.

 

Authenticity Guarantee: All of our fossils are 100% genuine specimens, carefully sourced and professionally handled. A Certificate of Authenticity is included with every fossil we sell, offering peace of mind and provenance.

 

This Catasigaloceras planicerclus ammonite is a beautiful and scientifically meaningful specimen — a rare and valuable addition to any fossil collection or Jurassic display.

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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