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Microfossil of the oil shale of the Green River formation: Triangular pollen with very large apertures. Colorado or Utah. 1925. Plate 25, figure 2, U.S. Geological Survey. Professional paper 168. 1931.
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Polished transverse section of reef shown in Bradley photo 209; showing alternate algal and inorganic layers, the irregular light colored layers consists of the molds of Chlorellopsis coloniata and typical spongy algal deposit. The black and gray finely banded layers are of inorganic origin and owe their dark color to disseminated pyrite. Enlarged 3 diameters. Compare with the photomicrograph of thin section of part of the same reef shown in Bradley photo 242. Specimen is from near the base of the Tipton tongue of Green River formation in NW 1/4 16, T.24 N., R. 101 W. Sweetwater County, Wyoming. 1923. Plate 45-A in U.S. Geological Survey. Professional paper 154. 1929.
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Photomicrograph of a thin section showing in detail the individual cells of chlorellopis reis; the walls of each hollow sphere consist of a mosaic of moderately coarse grained calcite crystals. The dark matrix is microcrystalline calcite. Enlarged 100 diameters; Specimen originally from NE cor. sec. 1, T. 24 N., R. 100 W: Sweetwater County, Wyoming. 1923. Portion is Plate 32-A in U.S. Geological Survey. Professional paper 154. 1929.
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Album caption: Looking down Zion Canyon from just below the "Narrows". Zion National Park, Utah. June 10, 1925. Index card: View down canyon from "Narrows". Zion National Park. 1925.
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Salt crystal cavities in a bed of marlstone suggesting interlock plates of anhydrite. Rio Blanco County, Colorado. circa 1925. Plate 6-B, U.S. Geological Survey. Professional paper 168. 1931.
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Polished transverse section of the digitate reef shown in Bradley photo 248: natural size. Specimen is from Hells Canyon, sec. 22 T. 10 S., R. 25 E. Uintah County, Utah. September 15, 1925. Plate 42-A in U.S. Geological Survey. Professional paper 154. 1929.
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Detail of the Bishop conglomerate on the south side of Little Mountain; the larger boulders are a little more than 1 foot across. Sweetwater County, Wyoming. 1930. Plate 39-B, U.S.Geological Survey Professional paper 185-I. 1936.
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Thin section of a recent algae reef from Green Lake: showing the typical spongy structure of the microcrystalline calcite produced by a felt of fresh water algae. This also shows a portion of the recrystallized and denser surface layer in the upper left quadrant. Enlarged 30 diameters. Onondaga County, New York. July 1926. Plate 30-B in U.S. Geological Survey. Professional paper 154. 1929.
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Album caption: View east toward Cable Mountain. Cross bedding fairly well shown. Zion National Park, Utah. June 10, 1925. Index card: View east toward Cable Mountain. Zion National Park. 1925.
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Polished section of a algal cobble, showing a large subangular limestone nucleus and three distinct stage of growth, natural size. Specimen is from transitional beds between the Tipton tongue of the Green River formation and the Cathedral Bluffs tongue of the Wasatch formation in NE 1/4 SE 1/4 sec. 15, T. 25 N., R. 102 W. Sweetwater County, Wyoming. 1923. Plate 46-A in U.S. Geological Survey. Professional paper 154. 1929.
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Microfossil of the oil shale of the Green River formation: spore similar to the conidia of Brachysporium sp. Colorado or Utah. 1925. Plate 20, figure 7, U.S. Geological Survey. Professional paper 168. 1931.
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Transverse section of the pitted Chlorellopsis reef shown in Bradley 205; showing the cores of sand filled ringed pits and the conoidal excrescences at their lower ends. This also shows the marked thickening of the algal layers between pit cores, natural size. Specimen is from about 138 feet below the top of the Green River formation in NE 1/4 SE 1/4 sec. 30, T. 4 N., R. 96 W. Moffat County, Colorado. August 1, 1925. Plate 38-A in U.S. Geological Survey. Professional paper 154. 1929.
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Algal pebbles formed chiefly of Chlorellopsis coloniata Reis in a matrix of ostracode limestone, natural size. Garfield County, Colorado. August 18, 1925. Plate 46-B in U.S. Geological Survey. Professional paper 154. 1929.
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Photomicrograph of typical physico-chemical incrustation of calcite: showing the radial structure interrupted by thin concentric zones of limonite granules. The irregular black layer at the base and the small rounded cushion shaped area near the center are spongy algal deposits, which appear almost opaque because they consist of calcite that is almost cryptocrystalline. Enlarged 10 diameters. From the Tipton tongue of the Green River formation, sec. 21, T. 4 N., R. 101 W: Sweetwater County, Wyoming. 1923. Marks on this photo correspond to plate 34-C in U.S. Geological Survey. Professional paper 154. 1929.
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Photomicrograph of a group of minute apophylite crystals isolated from oil shale, showing nearly perfect prismatic crystals and also irregular forms. From a thin rich layer of oil shale in the "Mahogany ledge" at the U.S. Bureau of Mines experimental min in sec. 23, T. 6 S., R. 96 W. The grains are immersed in an oil which has a refractive index of 1.58; enlarged 500 diameters. Garfield County, Colorado. 1927. Plate 3-A in U.S. Geological Survey. Professional paper 158. 1930.
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Deposit formed around wood by chlorellopsis Reis, natural size. Specimen is from the base of the Laney shale member of the Green River formation, SE 1/4 sec.23, T. 25 N., R. 103 W. Sweetwater County, Wyoming. 1923. Plate 36-A in U.S. Geological Survey. Professional paper 154. 1929.
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Steep false bedding in a fine grained muddy sandstone of the delta facies in a small canyon tributary to Minnie Maud Creek; the steepness of the bedding is local and apparently due to differential compaction; near the Duchesne-Uintah County line. Utah. September 11, 1925. Plate 9-A, U.S. Geological Survey. Professional paper 168. 1931.
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Contorted bedding due to differential compaction in a bed of oil shale near the mouth of Piceance Creek; Rio Blanco County, Colorado. July 30, 1925. Plate 14-A, U.S. Geological Survey. Professional paper 168. 1931.
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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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Album caption: The Three Patriarchs from east side of Canyon looking about northwest. Zion National Park, Utah. June 10, 1925. Panorama with photo no. 149. Index card: Panorama with 149. Note: Panorama with bwh00149, bwh00151.


map background search result map search result map View down Zion Canyon from just below The Narrows, Zion National Park, Utah. 1925. The Three Patriarchs, Zion National Park, Utah. 1925. View east toward Cable Mountain, Zion National Park, Utah. 1925. View down Zion Canyon from just below The Narrows, Zion National Park, Utah. 1925. The Three Patriarchs, Zion National Park, Utah. 1925. View east toward Cable Mountain, Zion National Park, Utah. 1925.