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 Pseudomonotis fallax Bivalves – Upper Triassic Aust Cliff Bristol UK – Genuine with Certificate
RARE Fossil Pseudomonotis fallax Bivalves – Upper Triassic Aust Cliff Bristol UK – Genuine with Certificate - Image 2

RARE Fossil Pseudomonotis fallax Bivalves – Upper Triassic Aust Cliff Bristol UK – Genuine with Certificate

Original price was: £12.60.Current price is: £11.34.

A scientifically significant and beautifully preserved fossil bivalve assemblage of Pseudomonotis fallax, collected from the renowned Westbury Formation (Upper Triassic) at Aust Cliff, Bristol, UK — one of the most famous fossiliferous cliff exposures in Britain.

This authentic specimen was discovered by our dedicated team members Alister and Alison on 07 April 2025 and was expertly cleaned, prepped, and treated by Alison. It features multiple Pseudomonotis fallax bivalves embedded in matrix, displaying natural detail and fine preservation.

These bivalves are characteristic of the Rhaetian Stage of the Upper Triassic, and their abundance in the Westbury Formation makes them valuable for biostratigraphy and palaeoenvironmental interpretation.

The Westbury Formation, part of the Penarth Group, represents a marginal marine to lagoonal depositional environment during the very latest Triassic, just before the end-Triassic mass extinction.

 

Geological & Taxonomic Information:

  • Fossil Type: Pseudomonotis fallax bivalves
  • Species: Pseudomonotis fallax (formerly classified within Monotis)
  • Geological Period: Triassic
  • Stage: Rhaetian (Upper Triassic)
  • Formation: Westbury Formation
  • Group: Penarth Group
  • Location: Aust Cliff, Bristol, UK
  • Depositional Environment: Marginal marine / lagoonal
  • Family: Halobiidae
  • Order: Pterioida
  • Identified By: Historically described in UK stratigraphic and faunal surveys; species well-documented in literature

 

What You Receive:

  • The exact fossil specimen shown
  • A Certificate of Authenticity
  • Secure, professional packaging

A superb piece for collectors, educational displays, or those interested in ancient marine ecosystems and extinction events.

 

Note:

All of our Fossils are 100% Genuine Specimens & come with a Certificate of Authenticity.

Scale cube = 1cm. Please see photo for full sizing.

 

(Actual as seen)

Only 1 left in stock

SKU: CF3203 Category:

Description

A scientifically significant and beautifully preserved fossil bivalve assemblage of Pseudomonotis fallax, collected from the renowned Westbury Formation (Upper Triassic) at Aust Cliff, Bristol, UK — one of the most famous fossiliferous cliff exposures in Britain.

This authentic specimen was discovered by our dedicated team members Alister and Alison on 07 April 2025 and was expertly cleaned, prepped, and treated by Alison. It features multiple Pseudomonotis fallax bivalves embedded in matrix, displaying natural detail and fine preservation.

These bivalves are characteristic of the Rhaetian Stage of the Upper Triassic, and their abundance in the Westbury Formation makes them valuable for biostratigraphy and palaeoenvironmental interpretation.

The Westbury Formation, part of the Penarth Group, represents a marginal marine to lagoonal depositional environment during the very latest Triassic, just before the end-Triassic mass extinction.

 

Geological & Taxonomic Information:

  • Fossil Type: Pseudomonotis fallax bivalves
  • Species: Pseudomonotis fallax (formerly classified within Monotis)
  • Geological Period: Triassic
  • Stage: Rhaetian (Upper Triassic)
  • Formation: Westbury Formation
  • Group: Penarth Group
  • Location: Aust Cliff, Bristol, UK
  • Depositional Environment: Marginal marine / lagoonal
  • Family: Halobiidae
  • Order: Pterioida
  • Identified By: Historically described in UK stratigraphic and faunal surveys; species well-documented in literature

 

What You Receive:

  • The exact fossil specimen shown
  • A Certificate of Authenticity
  • Secure, professional packaging

A superb piece for collectors, educational displays, or those interested in ancient marine ecosystems and extinction events.

 

Note:

All of our Fossils are 100% Genuine Specimens & come with a Certificate of Authenticity.

Scale cube = 1cm. Please see photo for full sizing.

 

Additional information

Era

Triassic
Origin

United Kingdom

Triassic Information

The Triassic Period (252–201 million years ago) marked the beginning of the Mesozoic Era, following the Permian-Triassic mass extinction, the most severe extinction event in Earth's history. The climate was hot and dry, with vast deserts and little polar ice. Life slowly recovered, leading to the rise of the first dinosaurs, pterosaurs (flying reptiles), and early mammals. Reptiles, including large archosaurs (ancestors of crocodiles and dinosaurs), dominated both land and sea. In the oceans, ichthyosaurs and plesiosaurs thrived alongside ammonites and early coral reefs. The first true conifers and ginkgo trees spread across the land. The period ended with another mass extinction, paving the way for the Jurassic and the golden age of dinosaurs.

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