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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Another impressive and large British Columbia trilobite! This Orygmaspis calvilimbata trilobite measures approximately 4.5 × 4.5 cm and is preserved on an elongated, irregular rock plate measuring 13 × 7.5 cm. I like the broad cephalon (head shield) and impressive spines extending backward beside the body.
Grey and tan tones accentuate the fossil’s relief against the surrounding matrix. Visible fractures cross the head shield and body, with areas of surface loss and uneven preservation, particularly around the head and rear of the fossil. The plate retains rough split surfaces and patches of ochre-brown staining.
The broad proportions and clearly defined body segments give this specimen a strong visual presence within a Canadian Cambrian trilobite collection.
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
Formation: McKay Group
Locality: Bull River valley, East of Cranbrook, British Columbia, Canada
Dimensions: Trilobite: 4.5 × 4.5 cm; plate: 13 × 7.5 cm
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The Exact Specimen Pictured
The specimen shown in the photographs is the exact specimen you will receive.
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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.