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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.
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Microfossil of the oil shale of the Green River formation: Trilobate spinose pollen grain. Colorado or Utah. 1925. Plate 25, figure 3, U.S. Geological Survey. Professional paper 168. 1931.
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Confervites Mantiensis and associated coprolites; photomicrograph of cellular parts of Confervites Mantiensis Bradley: of small coprolites in a partly silicified groundmass of microcline calcite, associated with filamentous algae in an algae reef from the "Manti beds"; enlarged 30 diameters. Specimen is originally from sec. 6, T. 18 S., R. 3 E. San Pete County, Utah. July 20, 1925. Portion is plate 33-B in U.S. Geological Survey. Professional paper 154. 1929.
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Thin section of a rich oil shale bed from asphalt tunnel, sec. 1, T. 7 S., R. 98 W., showing figured organic material embedded in a structure less groundmass. This photomicrograph shows the spines of insect larvae, probably a species of Oestridae still arranged in tiers. It also shows part of larval skins (the large black areas) and fragments of the eyes and wings of minute adult insects. C.A. Davis thin section was made prior to 1916: enlarged 110 times. Garfield County, Colorado. Plate 18, U.S. Geological Survey. Professional paper 168. 1931.
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Specimen of oil shale breccia, shows a large fragment in the middle, oriented at a small angle with the normal bedding so that it shows its own lamination, which is quite different from that of the rock. Upon the upturned fragment is a patch of Lepidosleus scales. Rio Blanco County, Colorado. August 16, 1925. Plate 16-A, U.S. Geological Survey. Professional paper 168. 1931.
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Bedding plane of brown organic marlstone covered with large Spinose fly larvae, lithohypoderma sp. natural size, from Uintah County, Utah. September 14, 1925. Plate 2-B, U.S. Geological Survey. Professional paper 168. 1931.
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Microfossil of the oil shale of the Green River formation: Group of spores. Colorado or Utah. 1925. Plate 23, figure 9, U.S. Geological Survey. Professional paper 168. 1931.
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Contact between the Bridger and Green River formations in the valley of Evacuation Creek, sec. 12, T. 10 S., R. 24 E., Salt Lake Meridian; this view shows plainly the differential compaction between the shaly marlstone of the Green River formation and the channel sandstone lenses at the base of the Bridger formation. Uintah County, Utah. September 26, 1925. Plate 12-A, with graphics, U.S. Geological Survey. Professional paper 168. 1931.
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Compound algal head consisting of many minor heads, each of which represents a single colony of algae. Specimen is from Tipton tongue of Green River formation in NE 1/4 NE 1/4 sec. 16, T.24 N., R. 102 W. Sweetwater County, Wyoming. 1923. Plate 44-B in U.S. Geological Survey. Professional paper 154. 1929.
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Microfossil of the oil shale of the Green River formation: Malvaceae type of pollen. Colorado or Utah. 1925. Plate 25, figure 5, U.S. Geological Survey. Professional paper 168. 1931.
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Upper surface of Chlorellopsis reef; with conoidal pits showing their relative size and the difference in texture between the interior of the pits and general surface of the roof, natural size. Moffat County, Colorado. August 1, 1925. Plate 37-B in U.S. Geological Survey. Professional paper 154. 1929.
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Microfossil of the oil shale of the Green River formation: Difflugia calcifera Bradley. n. sp. Colorado or Utah. 1925. Plate 25, figure 9, U.S. Geological Survey. Professional paper 168. 1931.
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Microfossil of the oil shale of the Green River formation: larva of lithohypoderma sp. Colorado or Utah. 1927. Plate 28, figure 5, U.S. Geological Survey. Professional paper 168. 1931.
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Polished specimen of algal pebbles showing details of internal structure, see published photo for details. Sweetwater County, Wyoming. 1923. Plate 47 in U.S. Geological Survey. Professional paper 154. 1929.
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Microfossil of the oil shale of the Green River formation: Spores. Colorado or Utah. 1925. Plate 23, figure 2, U.S. Geological Survey. Professional paper 168. 1931.
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Microfossil of the oil shale of the Green River formation: tupelo type of pollen. Colorado or Utah. 1925. Plate 25, figure 7, U.S. Geological Survey. Professional paper 168. 1931.
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Thin section of an oolite from the Laney shale member of the Green River formation on Shell Creek, sec. 9, T. 12 N., R. 98 W., showing large oolite grains with eccentric growth zones. The dark granulose parts of these grains con of mechanically enmeshed silt and the clearer parts consist of fine-grained calcite partly replaced by chalcedonic silica. The groundmass consists of chalcedonic silica, with scattered micro crystals of calcite. Enlarged 11-1/2 diameters. Sweetwater County, Wyoming. 1923. Center portion is plate 48-A in U.S. Geological Survey. Professional paper 154. 1929.
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Microfossil of the oil shale of the Green River formation: Euglypha robusticornis Bradley. n. sp. individual with 5 spines. Colorado or Utah. 1925. Plate 25, figure 10, U.S. Geological Survey. Professional paper 168. 1931.
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Photomicrograph of a thin section cut parallel to the bedding of a rich stratum of oil shale studded with analcite crystals. The finest white specks are grains of dolomite and calcite; the jet-black is pyrite, which in places encircles analcite crystals; and the gray groundmass (almost obscured by the abundance of minute carbonate grains) is structure less organic matter; enlarged 36 diameters. Garfield County, Colorado. July 25, 1924. Plate 2-B in U.S. Geological Survey. Professional paper 158. 1930.
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Thin bed of fairly rich oil shale, which failed locally under stresses due to differential compaction by distributive thrust faults, other parts of the same bed yielded by folding. Uintah County, Utah. September 14, 1925. Plate 15-B, U.S. Geological Survey. Professional paper 168. 1931.
map background search result map search result map Compound algal head consisting of many minor heads, each of which represents a single colony of algae. Sweetwater County, Wyoming. 1923. Contact between the Bridger and Green River formations in the valley of Evacuation Creek. Uintah County, Utah. 1925. Thin bed of fairly rich oil shale. Uintah County, Utah. 1925. Bedding plane of brown organic marlstone covered with large Spinose fly larvae, lithohypoderma sp. from Uintah County, Utah. 1925. Upper surface of Chlorellopsis reef. Moffat County, Colorado.1925. Polished specimen of algal pebbles showing details of internal structure. Sweetwater County, Wyoming. 1923. Confervites Mantiensis and associated coprolites. Sanpete County, Utah. 1925. Thin section of an oolite from the Laney shale member of the Green River formation on Shell Creek. Sweetwater County, Wyoming. 1923. Photomicrograph of a part of the thin section shown in Bradley photo 303. Uintah County, Utah. 1925. Confervites Mantiensis and associated coprolites. Sanpete County, Utah. 1925. Upper surface of Chlorellopsis reef. Moffat County, Colorado.1925. Contact between the Bridger and Green River formations in the valley of Evacuation Creek. Uintah County, Utah. 1925. Thin bed of fairly rich oil shale. Uintah County, Utah. 1925. Bedding plane of brown organic marlstone covered with large Spinose fly larvae, lithohypoderma sp. from Uintah County, Utah. 1925. Photomicrograph of a part of the thin section shown in Bradley photo 303. Uintah County, Utah. 1925. Compound algal head consisting of many minor heads, each of which represents a single colony of algae. Sweetwater County, Wyoming. 1923. Polished specimen of algal pebbles showing details of internal structure. Sweetwater County, Wyoming. 1923. Thin section of an oolite from the Laney shale member of the Green River formation on Shell Creek. Sweetwater County, Wyoming. 1923.