Photomicrographs of rocks of facies in the Watahomigi Formation, Twentynine Mile Canyon. Grand Canyon National Park, Coconino County, Arizona. No date.
Summary
Album caption and index card: Photomicrographs (x 10) of rocks of facies in the Watahomigi Formation, Grand Canyon region. A, Argillaceous mudstone of facies A (red argillaceous mudstone and coarse-grained siltstone), Twentynine Mile Canyon. Grand Canyon National Park. Coconino County, Arizona. n.d. Published as Figure P7-A in U.S. Geological Survey. Professional Paper 1173. 1982.
Summary
Album caption and index card: Photomicrographs (x 10) of rocks of facies in the Watahomigi Formation, Grand Canyon region. A, Argillaceous mudstone of facies A (red argillaceous mudstone and coarse-grained siltstone), Twentynine Mile Canyon. Grand Canyon National Park. Coconino County, Arizona. n.d.
Published as Figure P7-A in U.S. Geological Survey. Professional Paper 1173. 1982.
Available in the U.S. Geological Survey, Denver Library Photographic Collection, McKee, E.D. Collection.
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