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" Fossil Ammonite Ampthillia ampthillensis | Jurassic Oxfordian Ampthill Clay Oxfordshire UK | Genuine + COA
Rare 10" Fossil Ammonite Ampthillia ampthillensis | Jurassic Oxfordian Ampthill Clay Oxfordshire UK | Genuine + COA - Image 2

Rare 10″ Fossil Ammonite Ampthillia ampthillensis | Jurassic Oxfordian Ampthill Clay Oxfordshire UK | Genuine + COA

£72.00

This listing features a rare and beautifully preserved 10-inch fossil ammonite, Ampthillia ampthillensis, from the Oxfordian Stage of the Upper Jurassic Period, discovered in the Ampthill Clay Formation of Oxfordshire, United Kingdom. The photograph shows the actual specimen you will receive. Each square or cube in the scale image = 1cm — please view photo for complete sizing.

This is a museum-quality specimen, ideal for collectors, educators, and palaeontologists alike.

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

Geological & Scientific Information:

  • Fossil Type: Ammonite
  • Species: Ampthillia ampthillensis
  • Order: Ammonitida
  • Superfamily: Perisphinctoidea
  • Family: Aspidoceratidae (historically linked to Perisphinctidae in some classifications)
  • Geological Stage: Oxfordian (approx. 163.5 – 157.3 million years ago)
  • Formation: Ampthill Clay Formation
  • Locality: Oxfordshire, England, United Kingdom
  • Depositional Environment: Offshore marine shelf, characterised by dark clays and fine silts, indicating low-energy, relatively deep-water conditions in a subtropical epicontinental sea

Morphology & Notable Features:

  • Large, moderately involute shell with prominent ribbing
  • Ornamentation consists of bold, bifurcating ribs that cross the flanks and weaken toward the venter
  • Broad umbilicus with shallow depth
  • Sutures are complex and well-defined in this specimen, aiding in species verification
  • The genus Ampthillia is distinguished by its unique blend of early Perisphinctoid features and evolutionary transition traits seen in later Jurassic ammonites

Scientific Significance:

Ampthillia ampthillensis is a species known primarily from the Ampthill Clay of southern England and is relatively scarce in well-preserved large examples. It is a key taxon for understanding ammonite evolution and stratigraphy during the Oxfordian Stage. Its presence provides important correlation markers for Upper Jurassic marine sequences across Europe.

Described in classic 19th and early 20th-century ammonite literature, Ampthillia has been critical to refining the taxonomy of Aspidoceratidae and interpreting palaeoecological dynamics of Late Jurassic seas.

Ideal For:

  • Advanced fossil and ammonite collectors
  • Museum or academic reference collections
  • Natural history exhibits and geology education
  • Anyone seeking a scientifically significant and visually impressive display piece

What You Will Receive:

  • The exact 10″ specimen of Ampthillia ampthillensis shown in the listing
  • Certificate of Authenticity
  • Professional protective packaging and prompt delivery

 

(Actual as seen)

Only 1 left in stock

SKU: UF4548 Category:

Description

This listing features a rare and beautifully preserved 10-inch fossil ammonite, Ampthillia ampthillensis, from the Oxfordian Stage of the Upper Jurassic Period, discovered in the Ampthill Clay Formation of Oxfordshire, United Kingdom. The photograph shows the actual specimen you will receive. Each square or cube in the scale image = 1cm — please view photo for complete sizing.

This is a museum-quality specimen, ideal for collectors, educators, and palaeontologists alike.

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

Geological & Scientific Information:

  • Fossil Type: Ammonite
  • Species: Ampthillia ampthillensis
  • Order: Ammonitida
  • Superfamily: Perisphinctoidea
  • Family: Aspidoceratidae (historically linked to Perisphinctidae in some classifications)
  • Geological Stage: Oxfordian (approx. 163.5 – 157.3 million years ago)
  • Formation: Ampthill Clay Formation
  • Locality: Oxfordshire, England, United Kingdom
  • Depositional Environment: Offshore marine shelf, characterised by dark clays and fine silts, indicating low-energy, relatively deep-water conditions in a subtropical epicontinental sea

Morphology & Notable Features:

  • Large, moderately involute shell with prominent ribbing
  • Ornamentation consists of bold, bifurcating ribs that cross the flanks and weaken toward the venter
  • Broad umbilicus with shallow depth
  • Sutures are complex and well-defined in this specimen, aiding in species verification
  • The genus Ampthillia is distinguished by its unique blend of early Perisphinctoid features and evolutionary transition traits seen in later Jurassic ammonites

Scientific Significance:

Ampthillia ampthillensis is a species known primarily from the Ampthill Clay of southern England and is relatively scarce in well-preserved large examples. It is a key taxon for understanding ammonite evolution and stratigraphy during the Oxfordian Stage. Its presence provides important correlation markers for Upper Jurassic marine sequences across Europe.

Described in classic 19th and early 20th-century ammonite literature, Ampthillia has been critical to refining the taxonomy of Aspidoceratidae and interpreting palaeoecological dynamics of Late Jurassic seas.

Ideal For:

  • Advanced fossil and ammonite collectors
  • Museum or academic reference collections
  • Natural history exhibits and geology education
  • Anyone seeking a scientifically significant and visually impressive display piece

What You Will Receive:

  • The exact 10″ specimen of Ampthillia ampthillensis shown in the listing
  • Certificate of Authenticity
  • Professional protective packaging and prompt delivery

 

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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