Description
British Trilobite Fossil – Ogyginus (Partial) from Ordovician Wales
This striking British trilobite fossil is a genuine partial specimen of the classic Ordovician genus Ogyginus, collected from the renowned Upper Gilwern Quarry, Wales, UK, within the historic Llanvirn Series of the Ordovician period.
Trilobites are among the most recognisable and scientifically important fossil arthropods, and Welsh Ordovician examples are especially prized for their strong geological provenance and connection to Britain’s ancient marine ecosystems. This specimen is supplied with a stand, making it an excellent display piece for a fossil cabinet, office, or study.
Full sizing and scale are shown in the photographs. The listing images feature the exact fossil you will receive, carefully chosen for quality and presentation.
Discovery, Preparation & Authenticity
Your specimen was discovered by our own experienced team members, Alister and Alison, on 02 April 2024. Following collection, it was carefully cleaned, professionally prepped, and treated by Alison, ensuring that the fossil’s natural detail is preserved and attractively presented.
This fossil is a genuine prehistoric specimen and includes a Certificate of Authenticity lifetime guarantee generic card, confirming its authenticity and collectable status.
Fossil Identification & Classification
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Fossil Group: Trilobita
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Genus: Ogyginus
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Type: Partial trilobite fossil
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Age: Ordovician Period
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Stratigraphy: Llanvirn Series
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Locality: Upper Gilwern Quarry, Wales, United Kingdom
Trilobites were extinct marine arthropods that flourished throughout the Paleozoic Era. The genus Ogyginus is a well-known British Ordovician trilobite, recognised for its robust exoskeleton and classic segmented form.
Partial specimens often preserve key morphological features such as sections of the cephalon (head shield), thoracic segments, and surface ornamentation. The fossilised exoskeleton is typically mineralised with calcite, contributing to its durability and visual appeal.
Geological Context – The Llanvirn Series of Wales
This trilobite originates from rocks of the Llanvirn Series, deposited during the Middle Ordovician, approximately 465–470 million years ago. At that time, much of what is now Wales lay beneath warm, shallow seas teeming with marine life.
Fine-grained sediments accumulated on the seafloor, providing ideal conditions for fossil preservation. These deposits captured a diverse marine fauna, including trilobites, brachiopods, molluscs, and graptolites, forming one of Britain’s most significant Paleozoic fossil records.
Upper Gilwern Quarry is a classic Welsh fossil locality, known among collectors and researchers for producing trilobites preserved in Ordovician sedimentary rock, offering an exceptional window into early marine ecosystems.
Display Appeal & Collecting Value
This Ogyginus trilobite fossil is perfect for:
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Collectors of British and Ordovician fossils
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Natural history and palaeontology enthusiasts
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Educational study of trilobite anatomy and evolution
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Cabinet display with the included stand
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Unique gifts for geology lovers and fossil collectors
Trilobites remain one of the most iconic fossil groups worldwide, admired for their intricate segmentation, evolutionary significance, and connection to Earth’s ancient oceans.
Purchase Confidence
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Genuine British trilobite fossil (Ogyginus)
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Ordovician Period, Llanvirn Series
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Upper Gilwern Quarry, Wales, UK
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Discovered by Alister and Alison on 02 April 2024
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Cleaned, prepped, and treated by Alison
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Includes Certificate of Authenticity lifetime guarantee generic card
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Supplied with a display stand
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Photos show the exact specimen you will receive
A wonderful opportunity to own an authentic Welsh trilobite fossil from one of Britain’s most celebrated Ordovician localities, expertly prepared and ready for display.






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