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. SUMMARYThis 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.
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. SUMMARYThis 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.
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