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.

FREE UK DELIVERY - Save up to 60%

SALE 10%
RARE Mass Death Trilobite Fossil Assemblage – Parabolina spinulosa, P. bucephalus, Ourisia micrurus – Cwmhesgyn Formation, Wales
RARE Mass Death Trilobite Fossil Assemblage – Parabolina spinulosa, P. bucephalus, Ourisia micrurus – Cwmhesgyn Formation, Wales - Image 2
RARE Mass Death Trilobite Fossil Assemblage – Parabolina spinulosa, P. bucephalus, Ourisia micrurus – Cwmhesgyn Formation, Wales - Image 3
RARE Mass Death Trilobite Fossil Assemblage – Parabolina spinulosa, P. bucephalus, Ourisia micrurus – Cwmhesgyn Formation, Wales - Image 4

RARE Mass Death Trilobite Fossil Assemblage – Parabolina spinulosa, P. bucephalus, Ourisia micrurus – Cwmhesgyn Formation, Wales

Original price was: £600.00.Current price is: £540.00.

RARE Mass Death Assemblage of Trilobites

Parabolina spinulosa, Parabolina bucephalus, and Ourisia micrurus

Top of Cwmhesgyn Formation – Merioneth Series – Upper Cambrian

Craig-y-Dinas, Wales, UK

This extraordinary fossil represents a mass mortality assemblage featuring three distinct species of trilobites from the Upper Cambrian of Wales. Sourced from the top of the Cwmhesgyn Formation at Craig-y-Dinas, this piece includes well-preserved examples of Parabolina spinulosa, Parabolina bucephalus, and Ourisia micrurus. Such mixed-species clusters provide rare insight into the ecology, palaeobiogeography, and taphonomy of Cambrian seas.

Geological & Palaeontological Details:

  • Species Included:
  • Parabolina spinulosa
  • Parabolina bucephalus
  • Ourisia micrurus
  • Fossil Type: Multi-species trilobite death assemblage
  • Locality: Craig-y-Dinas, Trawsfynydd region, North Wales, UK
  • Formation: Cwmhesgyn Formation (uppermost strata)
  • Series: Merioneth Series
  • Stage: Furongian (Upper Cambrian)
  • Biozone: Parabolina Biozone (late Cambrian trilobite zones of the British Isles)
  • Depositional Environment:
  • Anoxic to dysoxic deep marine shelf
  • Fine-grained black mudstones indicative of low oxygen conditions ideal for the preservation of olenid trilobites
  • Family: Olenidae (Parabolina), Damesellidae (Ourisia)
  • Superfamily: Olenoidea (Olenidae), Dameselloidea (Damesellidae)
  • Order: Ptychopariida
  • Formally Described By:
  • Parabolina spinulosa – Hicks, 1872
  • Parabolina bucephalus – Lake, 1906
  • Ourisia micrurus – Rushton, 1966

Morphological Features:

  • Parabolina spinulosa: Noted for its long genal spines and delicate exoskeleton
  • Parabolina bucephalus: Larger form, with broad cephalon and tapering thorax
  • Ourisia micrurus: Compact morphology with shorter thoracic segments and prominent glabella
  • Specimens display fine segmentation, matrix relief impressions, and natural orientation on bedding plane

Why This Specimen Is Exceptional:

  • Features three distinct trilobite species in close association—very rare
  • Represents a mass death event, likely caused by sudden environmental change or sediment influx
  • Offers a snapshot of Upper Cambrian benthic ecology
  • Craig-y-Dinas is one of the few globally significant sites preserving these species together
  • Well-preserved examples on one slab, suitable for research, education, and premium display

Product & Purchase Info:

  • You will receive the exact fossil shown in the photographs
  • Scale cube = 1cm (see photos for full dimensions)
  • Comes with a Certificate of Authenticity
  • Professionally cleaned and conserved
  • Carefully sourced, prepared, and curated by our expert fossil team

Our Guarantee:

All of our Fossils are 100% Genuine Specimens & come with a Certificate of Authenticity. This rare specimen was hand-selected for its scientific importance and display quality.

If you have any questions or would like additional photos, please don’t hesitate to contact us.

(Actual as seen)

Includes a fully hand-signed Premium Certificate of Authenticity.

Only 1 left in stock

SKU: UF3921 Categories: ,

Description

RARE Mass Death Assemblage of Trilobites

Parabolina spinulosa, Parabolina bucephalus, and Ourisia micrurus

Top of Cwmhesgyn Formation – Merioneth Series – Upper Cambrian

Craig-y-Dinas, Wales, UK

This extraordinary fossil represents a mass mortality assemblage featuring three distinct species of trilobites from the Upper Cambrian of Wales. Sourced from the top of the Cwmhesgyn Formation at Craig-y-Dinas, this piece includes well-preserved examples of Parabolina spinulosa, Parabolina bucephalus, and Ourisia micrurus. Such mixed-species clusters provide rare insight into the ecology, palaeobiogeography, and taphonomy of Cambrian seas.

Geological & Palaeontological Details:

  • Species Included:
  • Parabolina spinulosa
  • Parabolina bucephalus
  • Ourisia micrurus
  • Fossil Type: Multi-species trilobite death assemblage
  • Locality: Craig-y-Dinas, Trawsfynydd region, North Wales, UK
  • Formation: Cwmhesgyn Formation (uppermost strata)
  • Series: Merioneth Series
  • Stage: Furongian (Upper Cambrian)
  • Biozone: Parabolina Biozone (late Cambrian trilobite zones of the British Isles)
  • Depositional Environment:
  • Anoxic to dysoxic deep marine shelf
  • Fine-grained black mudstones indicative of low oxygen conditions ideal for the preservation of olenid trilobites
  • Family: Olenidae (Parabolina), Damesellidae (Ourisia)
  • Superfamily: Olenoidea (Olenidae), Dameselloidea (Damesellidae)
  • Order: Ptychopariida
  • Formally Described By:
  • Parabolina spinulosa – Hicks, 1872
  • Parabolina bucephalus – Lake, 1906
  • Ourisia micrurus – Rushton, 1966

Morphological Features:

  • Parabolina spinulosa: Noted for its long genal spines and delicate exoskeleton
  • Parabolina bucephalus: Larger form, with broad cephalon and tapering thorax
  • Ourisia micrurus: Compact morphology with shorter thoracic segments and prominent glabella
  • Specimens display fine segmentation, matrix relief impressions, and natural orientation on bedding plane

Why This Specimen Is Exceptional:

  • Features three distinct trilobite species in close association—very rare
  • Represents a mass death event, likely caused by sudden environmental change or sediment influx
  • Offers a snapshot of Upper Cambrian benthic ecology
  • Craig-y-Dinas is one of the few globally significant sites preserving these species together
  • Well-preserved examples on one slab, suitable for research, education, and premium display

Product & Purchase Info:

  • You will receive the exact fossil shown in the photographs
  • Scale cube = 1cm (see photos for full dimensions)
  • Comes with a Certificate of Authenticity
  • Professionally cleaned and conserved
  • Carefully sourced, prepared, and curated by our expert fossil team

Our Guarantee:

All of our Fossils are 100% Genuine Specimens & come with a Certificate of Authenticity. This rare specimen was hand-selected for its scientific importance and display quality.

If you have any questions or would like additional photos, please don’t hesitate to contact us.

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.

Reviews

There are no reviews yet.

Only logged in customers who have purchased this product may leave a review.

Related products