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RARE Ourisia lenticularis Trilobite Fossil – Upper Cambrian – Cwmhesgyn Formation, Craig-y-Dinas, Wales – Certified Authentic
RARE Ourisia lenticularis Trilobite Fossil – Upper Cambrian – Cwmhesgyn Formation, Craig-y-Dinas, Wales – Certified Authentic - Image 2

RARE Ourisia lenticularis Trilobite Fossil – Upper Cambrian – Cwmhesgyn Formation, Craig-y-Dinas, Wales – Certified Authentic

Original price was: £36.00.Current price is: £32.40.

RARE Ourisia lenticularis Fossil Trilobite – Upper Cambrian – Merioneth Series – Cwmhesgyn Formation – Craig-y-Dinas, Wales

This is a highly desirable and rare specimen of the trilobite species Ourisia lenticularis, discovered in the Cwmhesgyn Formation, part of the Merioneth Series (Upper Cambrian), from Craig-y-Dinas, a classic fossil locality in Wales. Trilobites of this species are known for their small, rounded body forms and are highly sought after due to their stratigraphic and palaeontological significance.

Fossil Overview:

  • Species: Ourisia lenticularis
  • Type: Complete or partial fossil trilobite specimen
  • Geological Formation: Cwmhesgyn Formation
  • Stratigraphy: Merioneth Series (part of the Upper Cambrian)
  • Location: Craig-y-Dinas, Wales
  • Geological Age: Upper Cambrian (Furongian Stage, ~497–485 million years ago)
  • Depositional Environment: Deep marine basin, composed primarily of fine-grained mudstones and silty shale sediments, deposited in an anoxic seafloor environment

Morphology & Features:

Ourisia lenticularis is a ptychopariid trilobite notable for:

  • A distinct lenticular (lens-like) body shape
  • Reduced or absent eye ridges, suggesting adaptation to low-light benthic conditions
  • Gently convex glabella (central lobe of the cephalon)
  • Subtle axial segmentation and faint pleural furrows
  • Typically 9–11 thoracic segments
  • Smooth pygidium with rounded margins

These features point to a low-mobility deposit-feeding lifestyle within soft marine sediment.

Geological and Scientific Relevance:

  • Biozone: Possibly within the Parabolina spinulosa or equivalent uppermost Cambrian trilobite biozones
  • Stratigraphic Use: Ourisia lenticularis is a useful faunal component for biostratigraphic correlation across Cambrian sequences in Wales
  • Scientific Value: Illustrates evolutionary trends of ptychopariid trilobites in Cambrian deep-water environments
  • Collector Interest: Rarely offered species, particularly from classic localities like Craig-y-Dinas
  • Research Importance: Ideal reference for taxonomy, evolution, and palaeoecology of Furongian trilobites

Taxonomic Classification:

  • Phylum: Arthropoda
  • Class: Trilobita
  • Order: Ptychopariida
  • Family: Proasaphiscidae
  • Genus: Ourisia
  • Species: lenticularis
  • Formally Described By: R. M. Owens (1973) as part of Upper Cambrian trilobite systematics in Wales

Specimen Details:

  • Preservation: Good detail; see photo for the actual piece you will receive
  • Condition: Stable fossil on matrix
  • Scale: Each square/cube = 1cm; refer to image for exact dimensions
  • Authenticity: 100% genuine, ethically sourced, and includes a Certificate of Authenticity

Summary:

This is a rare opportunity to acquire a certified Ourisia lenticularis trilobite fossil from the Upper Cambrian Cwmhesgyn Formation, collected at Craig-y-Dinas, Wales. With its scientifically important features, aesthetic appeal, and rarity, this piece is a prized addition for fossil collectors, palaeontologists, and natural history enthusiasts alike.

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

(Actual as seen)

Only 1 left in stock

SKU: UF3907 Category:

Description

RARE Ourisia lenticularis Fossil Trilobite – Upper Cambrian – Merioneth Series – Cwmhesgyn Formation – Craig-y-Dinas, Wales

This is a highly desirable and rare specimen of the trilobite species Ourisia lenticularis, discovered in the Cwmhesgyn Formation, part of the Merioneth Series (Upper Cambrian), from Craig-y-Dinas, a classic fossil locality in Wales. Trilobites of this species are known for their small, rounded body forms and are highly sought after due to their stratigraphic and palaeontological significance.

Fossil Overview:

  • Species: Ourisia lenticularis
  • Type: Complete or partial fossil trilobite specimen
  • Geological Formation: Cwmhesgyn Formation
  • Stratigraphy: Merioneth Series (part of the Upper Cambrian)
  • Location: Craig-y-Dinas, Wales
  • Geological Age: Upper Cambrian (Furongian Stage, ~497–485 million years ago)
  • Depositional Environment: Deep marine basin, composed primarily of fine-grained mudstones and silty shale sediments, deposited in an anoxic seafloor environment

Morphology & Features:

Ourisia lenticularis is a ptychopariid trilobite notable for:

  • A distinct lenticular (lens-like) body shape
  • Reduced or absent eye ridges, suggesting adaptation to low-light benthic conditions
  • Gently convex glabella (central lobe of the cephalon)
  • Subtle axial segmentation and faint pleural furrows
  • Typically 9–11 thoracic segments
  • Smooth pygidium with rounded margins

These features point to a low-mobility deposit-feeding lifestyle within soft marine sediment.

Geological and Scientific Relevance:

  • Biozone: Possibly within the Parabolina spinulosa or equivalent uppermost Cambrian trilobite biozones
  • Stratigraphic Use: Ourisia lenticularis is a useful faunal component for biostratigraphic correlation across Cambrian sequences in Wales
  • Scientific Value: Illustrates evolutionary trends of ptychopariid trilobites in Cambrian deep-water environments
  • Collector Interest: Rarely offered species, particularly from classic localities like Craig-y-Dinas
  • Research Importance: Ideal reference for taxonomy, evolution, and palaeoecology of Furongian trilobites

Taxonomic Classification:

  • Phylum: Arthropoda
  • Class: Trilobita
  • Order: Ptychopariida
  • Family: Proasaphiscidae
  • Genus: Ourisia
  • Species: lenticularis
  • Formally Described By: R. M. Owens (1973) as part of Upper Cambrian trilobite systematics in Wales

Specimen Details:

  • Preservation: Good detail; see photo for the actual piece you will receive
  • Condition: Stable fossil on matrix
  • Scale: Each square/cube = 1cm; refer to image for exact dimensions
  • Authenticity: 100% genuine, ethically sourced, and includes a Certificate of Authenticity

Summary:

This is a rare opportunity to acquire a certified Ourisia lenticularis trilobite fossil from the Upper Cambrian Cwmhesgyn Formation, collected at Craig-y-Dinas, Wales. With its scientifically important features, aesthetic appeal, and rarity, this piece is a prized addition for fossil collectors, palaeontologists, and natural history enthusiasts alike.

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

Additional information

Era

Cambrian
Origin

United Kingdom

Cambrian Information

The Cambrian Period (541–485 million years ago) was the first period of the Paleozoic Era, marking a dramatic explosion of life known as the Cambrian Explosion. During this time, complex multicellular organisms rapidly diversified, giving rise to the first arthropods, mollusks, echinoderms, and chordates—early ancestors of vertebrates. The climate was generally warm, with high sea levels covering much of the continents, creating vast shallow seas where life thrived. Iconic creatures such as Trilobites, Anomalocaris, and Opabinia dominated the oceans, while the first primitive reefs formed. The Cambrian set the stage for the evolution of modern animal groups and the complexity of marine ecosystems.

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