Rocky Mountain Minerals and Fossils
Trilobite (Orygmaspis calvilimbata) on matrix - Bull River, Cranbrook, British Columbia, Canada
Trilobite (Orygmaspis calvilimbata) on matrix - Bull River, Cranbrook, British Columbia, Canada
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This specimen features an Orygmaspis calvilimbata trilobite measuring approximately 2 × 1.5 cm, preserved on an irregular 11.5 × 6 cm rock plate. Note the pronounced genal spines emanating from the sides of the head (cephalon). The body segments, called pleura, are quite think on this species.
Brown and tan tones highlight the fossil against the grey matrix, which carries a broad area of darker mottling. Visible fractures cross the head shield and adjacent rock, with small areas of surface loss around the fossil.
The distinct segmentation, sweeping genal spines and contrasting matrix give this Canadian Cambrian trilobite an appealing display presence.
The specimen comes from Upper Cambrian sediments of the McKay Group in the Bull River Valley, east of Cranbrook and Fort Steele, British Columbia, Canada.
British Columbia fossils are illegal to sell, except under special circumstances. I represent a team that has claims on several trilobite localities in BC that have been legally grandfathered into older legislation. This allows them to legally excavate, prepare and sell fossils from these particular claims, including this specimen. Learn more about British Columbia fossils and their legal status.
For those interested in learning more about the trilobites of the McKay Group I recommend the following scientific paper: Furongian (Upper Cambrian) trilobites from the McKay Group, Bull River Valley, near Cranbrook, southeastern British Columbia, Canada (2016) by Brian D. E. Chatterton and Stacey Gibb in Palaeontographica Canadiana No 35. It is jointly published by the Canadian Society of Petroleum Geologists (now known as the Canadian Energy Geoscience Association) and the Geological Association of Canada
Fossil: Trilobite
Species: Orygmaspis calvilimbata
Age: Upper Cambrian
Formation: McKay Group
Locality: Bull River valley, East of Cranbrook, British Columbia, Canada
Dimensions: Trilobite: 2 × 1.5 cm; plate: 11.5 × 6 cm
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The Exact Specimen Pictured
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Shipping & Local Pickup
We ship to Canada and the United States. Other destinations may be available by arrangement—contact us before ordering. Calgary pickup by appointment.