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RARE Pseudogrammoceras Fossil Ammonite Upper Lias Toarcian Cotswold Cephalopod Bed UK Genuine
RARE Pseudogrammoceras Fossil Ammonite Upper Lias Toarcian Cotswold Cephalopod Bed UK Genuine - Image 2

RARE Pseudogrammoceras Fossil Ammonite Upper Lias Toarcian Cotswold Cephalopod Bed UK Genuine

£24.00

This listing features a rare and scientifically important fossil ammonite of the genus Pseudogrammoceras, from the iconic Cotswold Cephalopod Bed, located at Coaley Woods, Uley, Gloucestershire, United Kingdom. It dates to the Upper Lias (Toarcian stage) of the Early Jurassic, approximately 182–174 million years ago.

This stunning example exhibits well-defined morphological features and is a classic representative of the fossil-rich marine strata of the English Lias Group. A carefully selected specimen, professionally cleaned and stabilised for optimal display.

  • Fossil Type: Ammonite (extinct marine cephalopod)
  • Genus: Pseudogrammoceras
  • Size: See photo with cm scale cube (1cm squares)
  • Geological Period: Early Jurassic
  • Stage: Toarcian (Upper Lias)
  • Biozone (where applicable): Possibly within the Bifrons or Variabilis Zone (commonly associated with this genus)
  • Family: Dactylioceratidae
  • Superfamily: Dactyliocerataceae
  • Order: Ammonitida
  • Locality: Coaley Woods, Uley, Gloucestershire, UK
  • Depositional Environment: Low-energy marine basin with fine-grained sedimentation, rich in nektonic and benthic fauna
  • Preservation: Excellent, with visible ribbing and typical involute coiling

Geological & Scientific Significance:

The Cotswold Cephalopod Bed is renowned for yielding abundant and diverse ammonite faunas from the Toarcian stage of the Early Jurassic. During this time, a series of warm, shallow seas covered much of southern England, laying down the fossiliferous mudstones and shales of the Upper Lias.

Pseudogrammoceras is a genus of evolute dactylioceratid ammonites, typically characterised by fine ribbing, a keeled venter, and complex suture patterns. These features suggest a fast-swimming, nektonic lifestyle, and the genus is important in Toarcian biostratigraphy. The ammonite is commonly associated with the Bifrons to Variabilis zones, helping correlate strata across Europe.

Specimens from Coaley Woods are prized for their preservation and geological context, with many housed in national and academic collections.

Notable Features:

  • Well-defined ribbing and shell structure
  • Excellent preservation from a classic UK locality
  • Key genus for Early Jurassic ammonite biostratigraphy

Authenticity Guaranteed: All of our fossils are 100% genuine. This specimen comes with a Certificate of Authenticity, guaranteeing its origin and scientific integrity.

Photo Disclosure: You will receive the exact specimen pictured. A 1cm scale cube is included for full sizing reference.

Whether for study, collecting, or display, this Pseudogrammoceras ammonite is a striking addition to any serious fossil or geological collection.

(Actual as seen)

Only 1 left in stock

SKU: UF4565 Category:

Description

This listing features a rare and scientifically important fossil ammonite of the genus Pseudogrammoceras, from the iconic Cotswold Cephalopod Bed, located at Coaley Woods, Uley, Gloucestershire, United Kingdom. It dates to the Upper Lias (Toarcian stage) of the Early Jurassic, approximately 182–174 million years ago.

This stunning example exhibits well-defined morphological features and is a classic representative of the fossil-rich marine strata of the English Lias Group. A carefully selected specimen, professionally cleaned and stabilised for optimal display.

  • Fossil Type: Ammonite (extinct marine cephalopod)
  • Genus: Pseudogrammoceras
  • Size: See photo with cm scale cube (1cm squares)
  • Geological Period: Early Jurassic
  • Stage: Toarcian (Upper Lias)
  • Biozone (where applicable): Possibly within the Bifrons or Variabilis Zone (commonly associated with this genus)
  • Family: Dactylioceratidae
  • Superfamily: Dactyliocerataceae
  • Order: Ammonitida
  • Locality: Coaley Woods, Uley, Gloucestershire, UK
  • Depositional Environment: Low-energy marine basin with fine-grained sedimentation, rich in nektonic and benthic fauna
  • Preservation: Excellent, with visible ribbing and typical involute coiling

Geological & Scientific Significance:

The Cotswold Cephalopod Bed is renowned for yielding abundant and diverse ammonite faunas from the Toarcian stage of the Early Jurassic. During this time, a series of warm, shallow seas covered much of southern England, laying down the fossiliferous mudstones and shales of the Upper Lias.

Pseudogrammoceras is a genus of evolute dactylioceratid ammonites, typically characterised by fine ribbing, a keeled venter, and complex suture patterns. These features suggest a fast-swimming, nektonic lifestyle, and the genus is important in Toarcian biostratigraphy. The ammonite is commonly associated with the Bifrons to Variabilis zones, helping correlate strata across Europe.

Specimens from Coaley Woods are prized for their preservation and geological context, with many housed in national and academic collections.

Notable Features:

  • Well-defined ribbing and shell structure
  • Excellent preservation from a classic UK locality
  • Key genus for Early Jurassic ammonite biostratigraphy

Authenticity Guaranteed: All of our fossils are 100% genuine. This specimen comes with a Certificate of Authenticity, guaranteeing its origin and scientific integrity.

Photo Disclosure: You will receive the exact specimen pictured. A 1cm scale cube is included for full sizing reference.

Whether for study, collecting, or display, this Pseudogrammoceras ammonite is a striking addition to any serious fossil or geological collection.

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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