Rocky Mountain Minerals and Fossils
Trilobite (Proceratopyge rectispinata) on matrix - Bull River, Cranbrook, British Columbia, Canada
Trilobite (Proceratopyge rectispinata) on matrix - Bull River, Cranbrook, British Columbia, Canada
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This specimen features a Proceratopyge rectispinata trilobite measuring approximately 1.5 × 1 cm, preserved near one end of an elongated 14 × 6.5 cm rock plate. The trilobite itself is complete but has been naturally broken and slightly displaced. Note the cephalon (head), thorax (body) and pygidium (tail) are all present along with thoracic spines. Preserved as a "calcite wafer", the trilobite somewhat appears to "pops out" of the matrix with some three-dimensionality. Due to is size (and relative completeness), this fossil is best appreciated under magnification. Note a second trilobite with only the thorax preserved is present on the plate as well.
The host rock is slate and I like the irregular light and dark banding. The patterned matrix and contrasting trilobite create an attractive miniature fossil display within a broader natural rock setting.
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: Proceratopyge rectispinata
Age: Upper Cambrian
Formation: McKay Group
Locality: Bull River valley, East of Cranbrook, British Columbia, Canada
Dimensions: Trilobite: 1.5 × 1 cm; plate: 14 × 6.5 cm
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We ship to Canada and the United States. Other destinations may be available by arrangement—contact us before ordering. Calgary pickup by appointment.