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Rare 4" Pachycardioceras robustum Fossil Ammonite – Oxfordian, Upper Jurassic, Redcliff Dorset UK – Genuine + COA
Rare 4" Pachycardioceras robustum Fossil Ammonite – Oxfordian, Upper Jurassic, Redcliff Dorset UK – Genuine + COA - Image 2

Rare 4″ Pachycardioceras robustum Fossil Ammonite – Oxfordian, Upper Jurassic, Redcliff Dorset UK – Genuine + COA

£120.00

A rare 4-inch Pachycardioceras robustum Fossil Ammonite, from the Oxfordian Stage of the Upper Jurassic, collected at Redcliff, Dorset, United Kingdom. This ammonite is a fine example of the genus Pachycardioceras, a robust and distinctive ammonite highly valued by collectors and researchers. The specimen shown in the photographs is the exact one you will receive, and it comes with a Certificate of Authenticity.

Fossil Type & Species:

  • Type: Ammonite (extinct marine cephalopod)
  • Species: Pachycardioceras robustum
  • Order: Ammonitida
  • Superfamily: Cardiocerataceae
  • Family: Cardioceratidae

Geological Context:

  • Period: Jurassic
  • Epoch/Stage: Upper Jurassic – Oxfordian (approx. 163.5 to 157.3 million years ago)
  • Biozone: Associated with the Cordatum Zone of the Oxfordian, important in defining ammonite stratigraphy in Europe
  • Formation: Oxford Clay / Oxfordian marl-limestone successions of Dorset
  • Depositional Environment: Shallow marine shelf with silty clays and carbonates, producing exceptional ammonite preservation

Locality:

  • Region: Redcliff, Dorset, United Kingdom

Morphology & Features:

  • Large, robust ammonite shell with broad whorls
  • Coarse ribbing, many ribs bifurcating across the flanks and ventral area
  • Strongly ornamented with well-defined growth lines
  • Diagnostic features that distinguish Pachycardioceras robustum from related species

Scientific Notes:

  • Pachycardioceras robustum is an index species of the Oxfordian Stage, first described in the 19th century
  • A key taxon for Upper Jurassic ammonite biostratigraphy across Europe

Notable Details:

  • Rare British ammonite with excellent preservation and display size (4 inches)
  • 100% genuine, natural fossil – no restoration
  • Scale Reference: Each square or cube in the image = 1cm. Please see photos for accurate sizing

Authenticity & Guarantee: All of our fossils are 100% genuine, responsibly sourced, and professionally curated. Each specimen is supplied with a Certificate of Authenticity. The fossil shown is the exact one you will receive.

 

This Pachycardioceras robustum ammonite is a rare and scientifically valuable fossil from the Oxfordian of Dorset – an excellent addition for collectors, researchers, or natural history displays.

 

(Actual as seen)

Only 1 left in stock

SKU: UF4305 Category:

Description

A rare 4-inch Pachycardioceras robustum Fossil Ammonite, from the Oxfordian Stage of the Upper Jurassic, collected at Redcliff, Dorset, United Kingdom. This ammonite is a fine example of the genus Pachycardioceras, a robust and distinctive ammonite highly valued by collectors and researchers. The specimen shown in the photographs is the exact one you will receive, and it comes with a Certificate of Authenticity.

Fossil Type & Species:

  • Type: Ammonite (extinct marine cephalopod)
  • Species: Pachycardioceras robustum
  • Order: Ammonitida
  • Superfamily: Cardiocerataceae
  • Family: Cardioceratidae

Geological Context:

  • Period: Jurassic
  • Epoch/Stage: Upper Jurassic – Oxfordian (approx. 163.5 to 157.3 million years ago)
  • Biozone: Associated with the Cordatum Zone of the Oxfordian, important in defining ammonite stratigraphy in Europe
  • Formation: Oxford Clay / Oxfordian marl-limestone successions of Dorset
  • Depositional Environment: Shallow marine shelf with silty clays and carbonates, producing exceptional ammonite preservation

Locality:

  • Region: Redcliff, Dorset, United Kingdom

Morphology & Features:

  • Large, robust ammonite shell with broad whorls
  • Coarse ribbing, many ribs bifurcating across the flanks and ventral area
  • Strongly ornamented with well-defined growth lines
  • Diagnostic features that distinguish Pachycardioceras robustum from related species

Scientific Notes:

  • Pachycardioceras robustum is an index species of the Oxfordian Stage, first described in the 19th century
  • A key taxon for Upper Jurassic ammonite biostratigraphy across Europe

Notable Details:

  • Rare British ammonite with excellent preservation and display size (4 inches)
  • 100% genuine, natural fossil – no restoration
  • Scale Reference: Each square or cube in the image = 1cm. Please see photos for accurate sizing

Authenticity & Guarantee: All of our fossils are 100% genuine, responsibly sourced, and professionally curated. Each specimen is supplied with a Certificate of Authenticity. The fossil shown is the exact one you will receive.

 

This Pachycardioceras robustum ammonite is a rare and scientifically valuable fossil from the Oxfordian of Dorset – an excellent addition for collectors, researchers, or natural history displays.

 

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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