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RARE Pseudoleioceras beyrichi Fossil Ammonite – Aalenian Stage Jurassic – Coalywood Gloucestershire UK – Alice Purnell Collection
RARE Pseudoleioceras beyrichi Fossil Ammonite – Aalenian Stage Jurassic – Coalywood Gloucestershire UK – Alice Purnell Collection - Image 2

RARE Pseudoleioceras beyrichi Fossil Ammonite – Aalenian Stage Jurassic – Coalywood Gloucestershire UK – Alice Purnell Collection

£24.00

Offered for sale is a rare and scientifically valuable fossil ammonite: Pseudoleioceras beyrichi, collected from the Aalenian Stage of the Middle Jurassic period. This specimen originates from the historically important locality of Coalywood, Gloucestershire, United Kingdom, known for its well-preserved ammonite faunas within the Inferior Oolite sequence.

Collected as part of the highly respected Alice Purnell Collection, this fossil is a 100% genuine specimen and is accompanied by a Certificate of Authenticity. The ammonite shown in the photograph is the exact specimen you will receive, chosen carefully for its completeness and detail.

Scale Rule Squares / Cube = 1cm – see photos for full dimensions.

Geological and Palaeontological Context

  • Species: Pseudoleioceras beyrichi
  • Geological Period: Jurassic
  • Stage: Aalenian (Middle Jurassic)
  • Age Range: ~174.1 – 170.3 million years ago
  • Location: Coalywood, Gloucestershire, UK
  • Formation: Upper Lias transitioning into the Inferior Oolite
  • Depositional Environment: Shallow marine setting with periodic low-oxygen conditions favouring fossil preservation

Taxonomic Classification

  • Family: Leioceratidae
  • Superfamily: Hildoceratoidea
  • Order: Ammonitida
  • Subclass: Ammonoidea
  • Class: Cephalopoda
  • Phylum: Mollusca

Morphological Features

  • Pseudoleioceras beyrichi is known for its involute, discoidal shell with a relatively smooth, compressed whorl section, and subtle to moderate ribbing.
  • The venter is typically rounded or lightly keeled, and the suture lines are moderately complex, reflecting its evolutionary position between early and more derived Middle Jurassic ammonites.
  • This species is often used in biozonation due to its distinct morphology and stratigraphic range.

Biozone and Stratigraphy

  • Typically found within the Opalinum Subzone of the Opalinum Zone, which defines the base of the Aalenian.
  • This biozone is widely recognised in European Jurassic stratigraphy and is used to correlate Aalenian marine successions across the continent.

Notable Significance

  • Pseudoleioceras beyrichi is a biostratigraphically important taxon, helping to mark the transition from the Toarcian to the Aalenian stages.
  • Specimens from Coalywood are rarely available on the open market, making this a notable acquisition for collectors, educators, or display.

Summary

This listing is for a rare and authentic Pseudoleioceras beyrichi ammonite fossil from the Aalenian Stage of the Jurassic, discovered in Coalywood, Gloucestershire, UK. It is part of the prestigious Alice Purnell Collection and includes a Certificate of Authenticity. A scientifically meaningful and visually impressive specimen, ideal for collectors or educational display.

Additional Information:

  • All of our Fossils are 100% Genuine Specimens & come with a Certificate of Authenticity.
  • The fossil shown in the photo is the exact item you will receive.
  • Scale cube = 1cm for reference.

 

(Actual as seen)

Only 1 left in stock

SKU: AF1282 Category:

Description

Offered for sale is a rare and scientifically valuable fossil ammonite: Pseudoleioceras beyrichi, collected from the Aalenian Stage of the Middle Jurassic period. This specimen originates from the historically important locality of Coalywood, Gloucestershire, United Kingdom, known for its well-preserved ammonite faunas within the Inferior Oolite sequence.

Collected as part of the highly respected Alice Purnell Collection, this fossil is a 100% genuine specimen and is accompanied by a Certificate of Authenticity. The ammonite shown in the photograph is the exact specimen you will receive, chosen carefully for its completeness and detail.

Scale Rule Squares / Cube = 1cm – see photos for full dimensions.

Geological and Palaeontological Context

  • Species: Pseudoleioceras beyrichi
  • Geological Period: Jurassic
  • Stage: Aalenian (Middle Jurassic)
  • Age Range: ~174.1 – 170.3 million years ago
  • Location: Coalywood, Gloucestershire, UK
  • Formation: Upper Lias transitioning into the Inferior Oolite
  • Depositional Environment: Shallow marine setting with periodic low-oxygen conditions favouring fossil preservation

Taxonomic Classification

  • Family: Leioceratidae
  • Superfamily: Hildoceratoidea
  • Order: Ammonitida
  • Subclass: Ammonoidea
  • Class: Cephalopoda
  • Phylum: Mollusca

Morphological Features

  • Pseudoleioceras beyrichi is known for its involute, discoidal shell with a relatively smooth, compressed whorl section, and subtle to moderate ribbing.
  • The venter is typically rounded or lightly keeled, and the suture lines are moderately complex, reflecting its evolutionary position between early and more derived Middle Jurassic ammonites.
  • This species is often used in biozonation due to its distinct morphology and stratigraphic range.

Biozone and Stratigraphy

  • Typically found within the Opalinum Subzone of the Opalinum Zone, which defines the base of the Aalenian.
  • This biozone is widely recognised in European Jurassic stratigraphy and is used to correlate Aalenian marine successions across the continent.

Notable Significance

  • Pseudoleioceras beyrichi is a biostratigraphically important taxon, helping to mark the transition from the Toarcian to the Aalenian stages.
  • Specimens from Coalywood are rarely available on the open market, making this a notable acquisition for collectors, educators, or display.

Summary

This listing is for a rare and authentic Pseudoleioceras beyrichi ammonite fossil from the Aalenian Stage of the Jurassic, discovered in Coalywood, Gloucestershire, UK. It is part of the prestigious Alice Purnell Collection and includes a Certificate of Authenticity. A scientifically meaningful and visually impressive specimen, ideal for collectors or educational display.

Additional Information:

  • All of our Fossils are 100% Genuine Specimens & come with a Certificate of Authenticity.
  • The fossil shown in the photo is the exact item you will receive.
  • Scale cube = 1cm for reference.

 

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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