Description
Paradoxides Trilobite Fossil from the Cambrian of St Davids
This genuine Paradoxides sp. trilobite fossil originates from the Menevian Group near St Davids, Pembrokeshire, Wales, United Kingdom, dating to the Cambrian Period, Series 3, approximately 510–500 million years ago. Trilobites from this formation are among the most historically important fossils in Britain and represent some of the earliest complex marine arthropods preserved in the fossil record.
Paradoxides was a large and distinctive trilobite genus that flourished during the middle Cambrian seas. Specimens from the Menevian Group are especially significant because they form part of one of the most classic Cambrian fossil assemblages studied by geologists and paleontologists since the nineteenth century.
This specimen preserves the characteristic trilobite body structure within the surrounding rock matrix, representing an ancient marine organism that lived more than half a billion years ago.
Geological Formation of the Menevian Group
The fossil comes from the Menevian Group, a series of Cambrian sedimentary rocks exposed around St Davids in Pembrokeshire, Wales. These rocks form part of the Cambrian stratigraphy of the Welsh Basin, where marine sediments accumulated in offshore environments during the early diversification of complex life.
The Menevian Group consists primarily of fine-grained shales and mudstones, which were deposited in relatively quiet marine conditions on the seabed. These sediments provided ideal conditions for preserving the remains of marine organisms such as trilobites, brachiopods, and other early invertebrates.
Cambrian deposits from this region are internationally recognised for their importance in understanding early marine ecosystems and the diversification of life during the Cambrian explosion.
Classification and Scientific Background
Paradoxides belongs to the phylum Arthropoda, class Trilobita, a group of extinct marine arthropods that dominated the oceans for more than 250 million years before becoming extinct at the end of the Permian Period.
Within trilobite classification, Paradoxides is placed in the order Redlichiida and the family Paradoxididae. Members of this family are known for their large size and elongated body segments.
The genus Paradoxides was formally described by the Swedish naturalist Joachim Barrande, one of the most influential paleontologists of the nineteenth century who conducted extensive studies on trilobites and other Paleozoic fossils.
Paradoxides trilobites are among the most recognisable Cambrian trilobites due to their large size and distinctive body proportions.
Trilobite Anatomy and Morphological Features
Trilobites possessed a unique body structure that gives the group its name, meaning “three lobes.” Their bodies were divided longitudinally into three sections: a central axial lobe and two pleural lobes.
The trilobite body was also divided into three main anatomical regions:
- Cephalon (head shield) containing compound eyes and sensory organs
- Thorax composed of multiple articulated segments allowing flexibility
- Pygidium (tail shield) formed from fused posterior segments
Paradoxides species are characterised by:
- A broad cephalon with a prominent glabella
- Numerous thoracic segments forming a long body
- Wide pleural spines extending from the thorax
- A relatively small pygidium compared with the body length
These features suggest a mobile seafloor lifestyle where the trilobite could move across sediment surfaces in search of food.
Cambrian Marine Ecosystem
During the Cambrian Period, much of Wales lay beneath shallow seas that supported diverse marine life. This period marks a time in Earth’s history known as the Cambrian Explosion, when many major animal groups first appeared in the fossil record.
The seafloor environment where Paradoxides lived was populated by a variety of early marine organisms including brachiopods, sponges, worms, and other arthropods. Trilobites were among the most abundant and successful animals of this ecosystem.
They likely fed on organic material, small invertebrates, or sediment particles while moving along the seabed. Their articulated exoskeleton allowed them to move efficiently and provided protection against predators.
The fine sediments of the Menevian Group eventually hardened into rock, preserving these ancient arthropods for hundreds of millions of years.
Authentic Fossil Specimen
This fossil is a genuine Paradoxides trilobite from the Menevian Group of St Davids, Pembrokeshire, Wales, UK. The specimen has been carefully selected for quality and display appeal.
The photograph shows the actual fossil specimen you will receive, allowing collectors to clearly see the preserved trilobite impression within the natural rock matrix.
Full sizing please see photo.
Certificate of Authenticity
This fossil includes a Certificate of Authenticity lifetime guarantee generic card, confirming that the specimen is a genuine natural fossil.
Paradoxides trilobites from the Cambrian rocks of Wales represent some of the earliest complex life forms preserved in the fossil record. Their age, distinctive morphology, and geological significance make them highly desirable additions to any fossil collection, geological display, or educational exhibit.
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