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 Fossil Ammonite Grossouvria sulcifera Jurassic Callovian Ashton Keynes UK | Authentic British Fossil
Rare Fossil Ammonite Grossouvria sulcifera Jurassic Callovian Ashton Keynes UK | Authentic British Fossil - Image 2

Rare Fossil Ammonite Grossouvria sulcifera Jurassic Callovian Ashton Keynes UK | Authentic British Fossil

£36.00

This listing features a rare and scientifically important fossil of Grossouvria sulcifera, a distinctive ammonite species from the Middle Callovian stage of the Jurassic period. Collected from the well-known Oxford Clay Formation at Ashton Keynes, Wiltshire, United Kingdom, this specimen represents a fascinating example of Middle Jurassic marine life.

Geological Context:

  • Fossil Type: Ammonite (Extinct marine cephalopod related to squid and cuttlefish)
  • Species: Grossouvria sulcifera (de Grossouvre, 1901)
  • Order: Ammonitida
  • Superfamily: Stephanoceratoidea
  • Family: Tulitidae (sometimes placed in Grossouviidae)
  • Geological Stage: Middle Callovian (c. 165.3 to 161.2 million years ago)
  • Formation: Oxford Clay Formation
  • Depositional Environment: Shallow marine shelf with clay-rich, low-energy sedimentation

Ammonites of the genus Grossouvria are valued for their robust shells and distinctive ornamentation. G. sulcifera is particularly notable for its well-defined ribbing and stratigraphic importance within the British Callovian ammonite record.

Morphology & Notable Features:

  • Moderately involute shell with thick, slightly compressed whorls
  • Prominent, evenly spaced ribbing across the flanks
  • Rounded venter without keel
  • Deeply incised suture lines, characteristic of the genus
  • Rare species with excellent display appeal and scientific relevance

Biozone Association: Grossouvria sulcifera is associated with the Athleta Zone of the Middle Callovian and is considered an important ammonite marker species in southern England and parts of northern Europe.

Specimen Details:

  • Origin: Ashton Keynes, Wiltshire, United Kingdom
  • Age: Middle Callovian Stage, Jurassic (~163 million years old)
  • Scale: Scale rule square/cube = 1cm. Please refer to photos for full dimensions
  • Condition: Professionally selected for its completeness, preservation, and detail
  • Photo: The exact specimen shown in the photos is the one you will receive

Certification & Authenticity: All of our fossils are 100% genuine and come with a Certificate of Authenticity. Each specimen is carefully chosen for its quality, geological interest, and visual appeal.

This rare Grossouvria sulcifera ammonite is a remarkable addition to any fossil collection, museum display, or educational exhibit—capturing a glimpse of Britain’s dynamic Middle Jurassic seas.

(Actual as seen)

Only 1 left in stock

SKU: UF4363 Category:

Description

This listing features a rare and scientifically important fossil of Grossouvria sulcifera, a distinctive ammonite species from the Middle Callovian stage of the Jurassic period. Collected from the well-known Oxford Clay Formation at Ashton Keynes, Wiltshire, United Kingdom, this specimen represents a fascinating example of Middle Jurassic marine life.

Geological Context:

  • Fossil Type: Ammonite (Extinct marine cephalopod related to squid and cuttlefish)
  • Species: Grossouvria sulcifera (de Grossouvre, 1901)
  • Order: Ammonitida
  • Superfamily: Stephanoceratoidea
  • Family: Tulitidae (sometimes placed in Grossouviidae)
  • Geological Stage: Middle Callovian (c. 165.3 to 161.2 million years ago)
  • Formation: Oxford Clay Formation
  • Depositional Environment: Shallow marine shelf with clay-rich, low-energy sedimentation

Ammonites of the genus Grossouvria are valued for their robust shells and distinctive ornamentation. G. sulcifera is particularly notable for its well-defined ribbing and stratigraphic importance within the British Callovian ammonite record.

Morphology & Notable Features:

  • Moderately involute shell with thick, slightly compressed whorls
  • Prominent, evenly spaced ribbing across the flanks
  • Rounded venter without keel
  • Deeply incised suture lines, characteristic of the genus
  • Rare species with excellent display appeal and scientific relevance

Biozone Association: Grossouvria sulcifera is associated with the Athleta Zone of the Middle Callovian and is considered an important ammonite marker species in southern England and parts of northern Europe.

Specimen Details:

  • Origin: Ashton Keynes, Wiltshire, United Kingdom
  • Age: Middle Callovian Stage, Jurassic (~163 million years old)
  • Scale: Scale rule square/cube = 1cm. Please refer to photos for full dimensions
  • Condition: Professionally selected for its completeness, preservation, and detail
  • Photo: The exact specimen shown in the photos is the one you will receive

Certification & Authenticity: All of our fossils are 100% genuine and come with a Certificate of Authenticity. Each specimen is carefully chosen for its quality, geological interest, and visual appeal.

This rare Grossouvria sulcifera ammonite is a remarkable addition to any fossil collection, museum display, or educational exhibit—capturing a glimpse of Britain’s dynamic Middle Jurassic 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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