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Photomicrograph of a thin section of specimen from an analcite crystal bed, showing the idiomorphism of crystals and the abundance of dust like inclusions; the jet-black pyrite and the clear gray areas between the crystals are holes in the section. From a bed about 750 feet above the base of the Green River formation in the canyon of the White River, sec. 27, T. 9S. R.25 E., enlarged 36 diameters. Uintah County, Utah. September 14, 1925. Plate 1-A in U.S. Geological Survey. Professional paper 158. 1930.
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Photomicrograph of a part of the thin section shown in Bradley photo 303; showing inclusions of minute lozenge shaped apophylite crystals in analcite, enlarged 500 diameters. Uintah County, Utah. September 14, 1925. Plate 1-B, with graphics, in U.S. Geological Survey. Professional paper 158. 1930.