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RARE Graphoceras Fossil Ammonite – Inferior Oolite, Aalenian, Jurassic – Sherborne Field UK – COA – Alice Purnell Collection
RARE Graphoceras Fossil Ammonite – Inferior Oolite, Aalenian, Jurassic – Sherborne Field UK – COA – Alice Purnell Collection - Image 2

RARE Graphoceras Fossil Ammonite – Inferior Oolite, Aalenian, Jurassic – Sherborne Field UK – COA – Alice Purnell Collection

£36.00

A rare and finely preserved specimen of the genus Graphoceras, an important ammonite from the Aalenian Stage of the Middle Jurassic, collected at Sherborne Field, United Kingdom. This fossil originates from the well-respected Alice Purnell Collection and represents a key evolutionary group within the Jurassic ammonoid lineage. The photo shows the exact specimen being offered.

Geological Context:

  • Genus: Graphoceras
  • Geological Period: Jurassic
  • Stage: Aalenian (~174 to 170.3 million years ago)
  • Formation: Inferior Oolite
  • Location: Sherborne Field, United Kingdom
  • Depositional Environment: Shallow marine carbonate platform characterised by oolitic limestones and marl beds, supporting diverse nektonic and benthic faunas in a warm, epicontinental sea

Taxonomic Classification:

  • Family: Graphoceratidae
  • Superfamily: Hildoceratoidea
  • Order: Ammonitida
  • Suborder: Ammonitina
  • Commonly Referenced Authors: First formally described by Alpheus Hyatt, with species such as Graphoceras concavum serving as zone fossils

Morphological Features:

Graphoceras species are recognised by their compressed, involute shells with a narrow umbilicus and strong, sinuous ribbing. The ribs often bifurcate and continue across the venter without interruption. The venter is typically rounded. Sutures are complex and deeply incised, reflecting its evolutionary advancement among the Hildoceratoidea.

This specimen displays these classic features clearly, with well-preserved ribbing and natural curvature across the whorls. Its surface detail and shell form make it a high-quality example of this important ammonite group.

Stratigraphic and Scientific Importance:

Graphoceratids such as Graphoceras play a crucial role in Jurassic ammonite biostratigraphy, particularly within the Concavum Zone and other subdivisions of the Aalenian. Their presence allows correlation across the Anglo-Paris Basin and wider Tethyan realms. As one of the first ammonite groups to evolve more complex suture lines post-Toarcian, they reflect important evolutionary transitions in mid-Jurassic faunas.

Additional Details:

  • All of our Fossils are 100% Genuine Specimens & come with a Certificate of Authenticity.
  • Scale Rule Squares / Cube = 1cm. See photo for full sizing.
  • From the scientifically curated Alice Purnell Collection.

This is a significant and display-worthy ammonite from an underrepresented time interval in the fossil record. A rare find for collectors, educators, and those interested in Jurassic marine ecosystems.

Add this authentic Graphoceras specimen to your fossil collection today.

(Actual as seen)

Only 1 left in stock

SKU: AF1268 Category:

Description

A rare and finely preserved specimen of the genus Graphoceras, an important ammonite from the Aalenian Stage of the Middle Jurassic, collected at Sherborne Field, United Kingdom. This fossil originates from the well-respected Alice Purnell Collection and represents a key evolutionary group within the Jurassic ammonoid lineage. The photo shows the exact specimen being offered.

Geological Context:

  • Genus: Graphoceras
  • Geological Period: Jurassic
  • Stage: Aalenian (~174 to 170.3 million years ago)
  • Formation: Inferior Oolite
  • Location: Sherborne Field, United Kingdom
  • Depositional Environment: Shallow marine carbonate platform characterised by oolitic limestones and marl beds, supporting diverse nektonic and benthic faunas in a warm, epicontinental sea

Taxonomic Classification:

  • Family: Graphoceratidae
  • Superfamily: Hildoceratoidea
  • Order: Ammonitida
  • Suborder: Ammonitina
  • Commonly Referenced Authors: First formally described by Alpheus Hyatt, with species such as Graphoceras concavum serving as zone fossils

Morphological Features:

Graphoceras species are recognised by their compressed, involute shells with a narrow umbilicus and strong, sinuous ribbing. The ribs often bifurcate and continue across the venter without interruption. The venter is typically rounded. Sutures are complex and deeply incised, reflecting its evolutionary advancement among the Hildoceratoidea.

This specimen displays these classic features clearly, with well-preserved ribbing and natural curvature across the whorls. Its surface detail and shell form make it a high-quality example of this important ammonite group.

Stratigraphic and Scientific Importance:

Graphoceratids such as Graphoceras play a crucial role in Jurassic ammonite biostratigraphy, particularly within the Concavum Zone and other subdivisions of the Aalenian. Their presence allows correlation across the Anglo-Paris Basin and wider Tethyan realms. As one of the first ammonite groups to evolve more complex suture lines post-Toarcian, they reflect important evolutionary transitions in mid-Jurassic faunas.

Additional Details:

  • All of our Fossils are 100% Genuine Specimens & come with a Certificate of Authenticity.
  • Scale Rule Squares / Cube = 1cm. See photo for full sizing.
  • From the scientifically curated Alice Purnell Collection.

This is a significant and display-worthy ammonite from an underrepresented time interval in the fossil record. A rare find for collectors, educators, and those interested in Jurassic marine ecosystems.

Add this authentic Graphoceras specimen to your fossil collection today.

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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