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RARE Ourisia micrurus Trilobite Fossil – Upper Cambrian, Cwmhesgyn Formation, Craig-y-Dinas, Wales

RARE Ourisia micrurus Trilobite Fossil – Upper Cambrian, Cwmhesgyn Formation, Craig-y-Dinas, Wales

Original price was: £120.00.Current price is: £108.00.

RARE Ourisia micrurus Fossil Trilobite

  • Location: Craig-y-Dinas, Wales, United Kingdom
  • Formation: Cwmhesgyn Formation
  • Geological Series: Merioneth Series
  • Geological Period: Upper Cambrian (approx. 494–485 million years ago)
  • Stratigraphic Context: Uppermost beds of the Cwmhesgyn Formation
  • Biozone: Parabolina spinulosa Zone
  • Depositional Environment: Deep marine basin, low-oxygen conditions, below wave base
  • Fossil Type: Complete or partial exoskeleton impression
  • Species: Ourisia micrurus
  • Family: Olenidae
  • Order: Ptychopariida
  • Superfamily: Olenoidea
  • Formally Described By: Richter (1956)

This authentic fossil represents the rare trilobite species Ourisia micrurus, discovered at Craig-y-Dinas in Wales. It originates from the top of the Cwmhesgyn Formation within the Merioneth Series of the Upper Cambrian. The site and fossil are stratigraphically significant, as Ourisia micrurus is characteristic of the Parabolina spinulosa Biozone.

Morphology Features:

  • Elongated, slender form
  • Semi-circular cephalon (head)
  • Narrow, evenly spaced thoracic segments
  • Small pygidium (tail section)

Adapted to thrive in low-oxygen marine environments, this species inhabited fine, silty seabeds over 490 million years ago. The fossil typically shows as an impression or natural positive relief on shale or mudstone.

What You Will Receive:

  • The actual specimen shown in the photos
  • Scale cube = 1 cm (full sizing in image)
  • A Certificate of Authenticity guaranteeing the fossil’s genuine origin
  • Secure and protective packaging for delivery

All of our Fossils are 100% Genuine Specimens and come with a Certificate of Authenticity. This fossil was carefully selected by our team for its scientific value, preservation, and presentation. It makes an excellent addition to any collection, educational resource, or natural history display.

For collectors, educators, or enthusiasts of ancient life, this is a museum-quality piece from one of the most significant Cambrian trilobite localities in the UK.

Let us know if you require further details — we’re always happy to help.

(Actual as seen)

Only 1 left in stock

SKU: UF3910 Category:

Description

RARE Ourisia micrurus Fossil Trilobite

  • Location: Craig-y-Dinas, Wales, United Kingdom
  • Formation: Cwmhesgyn Formation
  • Geological Series: Merioneth Series
  • Geological Period: Upper Cambrian (approx. 494–485 million years ago)
  • Stratigraphic Context: Uppermost beds of the Cwmhesgyn Formation
  • Biozone: Parabolina spinulosa Zone
  • Depositional Environment: Deep marine basin, low-oxygen conditions, below wave base
  • Fossil Type: Complete or partial exoskeleton impression
  • Species: Ourisia micrurus
  • Family: Olenidae
  • Order: Ptychopariida
  • Superfamily: Olenoidea
  • Formally Described By: Richter (1956)

This authentic fossil represents the rare trilobite species Ourisia micrurus, discovered at Craig-y-Dinas in Wales. It originates from the top of the Cwmhesgyn Formation within the Merioneth Series of the Upper Cambrian. The site and fossil are stratigraphically significant, as Ourisia micrurus is characteristic of the Parabolina spinulosa Biozone.

Morphology Features:

  • Elongated, slender form
  • Semi-circular cephalon (head)
  • Narrow, evenly spaced thoracic segments
  • Small pygidium (tail section)

Adapted to thrive in low-oxygen marine environments, this species inhabited fine, silty seabeds over 490 million years ago. The fossil typically shows as an impression or natural positive relief on shale or mudstone.

What You Will Receive:

  • The actual specimen shown in the photos
  • Scale cube = 1 cm (full sizing in image)
  • A Certificate of Authenticity guaranteeing the fossil’s genuine origin
  • Secure and protective packaging for delivery

All of our Fossils are 100% Genuine Specimens and come with a Certificate of Authenticity. This fossil was carefully selected by our team for its scientific value, preservation, and presentation. It makes an excellent addition to any collection, educational resource, or natural history display.

For collectors, educators, or enthusiasts of ancient life, this is a museum-quality piece from one of the most significant Cambrian trilobite localities in the UK.

Let us know if you require further details — we’re always happy to help.

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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