Basal conglomerate of Esplanade Sandstone and Pakoon Limestone showing well-rounded surfaces of clasts. Grand Canyon National Park, Coconino County, Arizona. No date.

Album caption and index card: Basal conglomerate of Esplanade Sandstone and Pakoon Limestone showing well-rounded surfaces of clasts and wide range in size from granule to cobble; composed almost entirely of red siltstones and gray limestones. A, Specimen from Havasu Canyon, Esplanade Sandstone; rule for scale. Grand Canyon National Park. Coconino County, Arizona. n.d. Published as Figure J5-A in U.S. Geological Survey. Professional Paper 1173. 1982.