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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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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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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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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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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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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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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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Unusually large dreikanter of granite on the Lander road a few miles south of Pacific Springs. This dreikanter measures 71 cm by 46 cm deep and 37 cm wide. Sweetwater County, Wyoming. 1930.
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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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Microfossil of the oil shale of the Green River formation: Tetraedron sp. cf. T. regulare. var. torsum (Turner) Brunnthaler. Colorado or Utah. 1925. Plate 21, figure 6, U.S. Geological Survey. Professional paper 168. 1931.
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Microfossil of the oil shale of the Green River formation: Spores. Colorado or Utah. 1925. Plate 23, figure 5, U.S. Geological Survey. Professional paper 168. 1931.
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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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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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Confervites Mantiensis and associated coprolites; photomicrograph of cellular parts of Confervites Mantiensis Bradley: polished specimen showing sparse colony of confervities Mantiensis in a partly silicified area of an algae reef from the "Mantis beds" The white areas are calcite; the darker ones chalcedonic silica; enlarged 10 diameters. Specimen is originally from sec. 6, T. 18 S., R. 3 E. San Pete County, Utah. July 20, 1925. Plate 33-C in U.S. Geological Survey. Professional paper 154. 1929.
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Small area of the polished specimen in Bradley 245; this shows a part of the oolitic sandstone which contains fragments of micro crystalline calcite with ferruginous oolite grains suspended in the positions in which they formed; fragments of algal limestone consisting almost wholly of Chlorellopsis and an unusually large oolite grains that show the wide banding characteristic of all the oolites in this bed. Enlarged 5 diameters. Specimen is from the basal part of an algae reef on the north side of White River, in the SW 1/4 sec. 30, T. 1 N., R. 95 W. Rio Blanco County, Colorado. Plate 48-B in U.S. Geological Survey. Professional paper 154. 1929.
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Photomicrograph of a part of the organic marlstone shown in Bradley photo 325, illustrating the regular spacing of the dark laminae; the thin section was cut abnormally thick so as to bring out the fore feebly colored organic layers. Enlarged 18 diameters. Garfield County, Colorado. 1927. Plate 12-B in U.S. Geological Survey. Professional paper 158. 1930.
map background search result map search result map Steep false bedding in a fine grained muddy sandstone of the delta facies in a small canyon tributary to Minnie Maud Creek. Duchesne-Uintah County line. Utah. 1925. Confervites Mantiensis and associated coprolites; photomicrograph of cellular parts of Confervites Mantiensis Bradley. Sanpete County, Utah. 1925. Small area of the polished specimen of the oolitic sandstone. Rio Blanco County, Colorado. No date. Deposit formed around wood by chlorellopsis Reis, natural size. Sweetwater County, Wyoming. 1923. Polished transverse section of the digitate reef shown in Bradley photo 248: natural size. Uintah County, Utah. 1925. Thin section of a recent algae reef from Green Lake. Onondaga County, New York. 1926. Microfossil of the oil shale of the Green River formation: Spores. Colorado or Utah.1925. Microfossil of the oil shale of the Green River formation: Tetraedron sp. cf. T. regulare. Colorado or Utah. 1925. Microfossil of the oil shale of the Green River formation: Triangular pollen with very large apertures. Colorado or Utah. 1925. Microfossil of the oil shale of the Green River formation: spore similar to the conidia of Brachysporium sp. Colorado or Utah. 1925. Detail of the Bishop conglomerate on the south side of Little Mountain. Sweetwater County, Wyoming. 1930. Thin section of a recent algae reef from Green Lake. Onondaga County, New York. 1926. Confervites Mantiensis and associated coprolites; photomicrograph of cellular parts of Confervites Mantiensis Bradley. Sanpete County, Utah. 1925. Steep false bedding in a fine grained muddy sandstone of the delta facies in a small canyon tributary to Minnie Maud Creek. Duchesne-Uintah County line. Utah. 1925. Small area of the polished specimen of the oolitic sandstone. Rio Blanco County, Colorado. No date. Polished transverse section of the digitate reef shown in Bradley photo 248: natural size. Uintah County, Utah. 1925. Deposit formed around wood by chlorellopsis Reis, natural size. Sweetwater County, Wyoming. 1923. Detail of the Bishop conglomerate on the south side of Little Mountain. Sweetwater County, Wyoming. 1930. Microfossil of the oil shale of the Green River formation: Spores. Colorado or Utah.1925. Microfossil of the oil shale of the Green River formation: Tetraedron sp. cf. T. regulare. Colorado or Utah. 1925. Microfossil of the oil shale of the Green River formation: Triangular pollen with very large apertures. Colorado or Utah. 1925. Microfossil of the oil shale of the Green River formation: spore similar to the conidia of Brachysporium sp. Colorado or Utah. 1925.