Description
Beautiful DOUBLE Peronopsis instricta Trilobite – Wheeler Shale, Middle Cambrian
This remarkable double Peronopsis instricta trilobite fossil comes from the world-famous Wheeler Shale Formation of the House Range, Antelope Springs, Millard County, Utah, USA—one of the most celebrated Cambrian fossil localities on the planet. The specimen you receive is the exact fossil photographed, carefully selected for quality, detail, and scientific interest. As with all our pieces, it is 100% genuine and supplied with a Certificate of Authenticity.
Geological Context – Middle Cambrian Wheeler Shale
The Wheeler Shale is an exceptional fossil-bearing formation deposited around 507 million years ago during the Middle Cambrian. This interval represents a dynamic period in Earth’s history when marine ecosystems were rapidly diversifying following the Cambrian Explosion. The Wheeler Shale’s fine-grained muds accumulated in a quiet, deeper-water marine environment ideal for the preservation of delicate arthropod bodies, trilobites, soft-bodied organisms, and trace fossils.
Fossils from Antelope Springs are globally recognised for their superb definition, with organisms often preserved in fine detail due to the unique geochemical and sedimentological conditions of this ancient basin. Collectors and researchers highly value Wheeler Shale trilobites for their scientific importance and aesthetic beauty.
About Peronopsis instricta – A Classic Agnostid Trilobite
Peronopsis instricta is a small but iconic member of the order Agnostida, a group of blind, typically isopygous trilobites whose cephalon and pygidium are nearly identical in size and shape. These characteristics make agnostids particularly fascinating, as their streamlined forms suggest a pelagic or free-swimming lifestyle.
This specimen is especially desirable because it features two individuals preserved together, offering a natural glimpse into possible behavioural grouping or shared depositional circumstances.
Typical morphological features of Peronopsis instricta include:
- Nearly symmetrical cephalon and pygidium
- Distinct median lobe characteristic of the species
- Smooth exoskeleton with minimal ornamentation
- Rounded margins typical of agnostids
These traits, combined with the fine-grained Wheeler matrix, produce a display piece that is both scientifically informative and visually striking.
Origin – Antelope Springs, House Range, Utah
The House Range has produced countless museum-grade Cambrian arthropods, with Antelope Springs being particularly famous for its trilobites. Fossils from this location are prized for their clarity, natural placement, and stable shale matrix. The region’s rich fossil record has contributed greatly to our understanding of early marine ecosystems and trilobite evolution.
Each piece from this location preserves a snapshot of Cambrian life, revealing organisms that lived during one of the most important evolutionary periods in Earth history.
Your Genuine Fossil Specimen
- Species: Peronopsis instricta
- Formation: Wheeler Shale
- Age: Middle Cambrian
- Locality: House Range, Antelope Springs, Millard County, Utah, USA
- Specimen Type: Double trilobite preservation
- Authenticity: Comes with a Certificate of Authenticity
- Sizing: Full dimensions shown in the listing photographs
- Exact Piece Shown: You will receive the precise fossil pictured
This double Peronopsis fossil is an exceptional addition for collectors of Cambrian trilobites, palaeontology enthusiasts, educational displays, or anyone seeking a stunning natural history specimen with deep scientific value.
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