Grand Canyon district

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Pre-Carboniferous strata in the Grand Canyon of the Colorado, Arizona
Charles Doolittle Walcott

American Journal of Science December 1883, s3-26 (156) 437-442; DOI: https://doi.org/10.2475/ajs.s3-26.156.437
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Some remarks on the geological structure of a district of country lying to the north of the Grand Canyon of the Colorado
John Wesley Powell

American Journal of Science June 1873, s3-5 (30) 456-465; DOI: https://doi.org/10.2475/ajs.s3-5.30.456

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