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Polished vertical section of a compound algal head consisting of many small heads, each of which represents a single colony of Chlorellopsis coloniata Reis., these minor bands rest upon a zone of spongy algal deposit, which is separated from another similar zone below by a finely banded inorganic agate like zone; natural size. 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-A in U.S. Geological Survey. Professional paper 154. 1929.
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Photomicrograph of a specimen from an analcite crystal bed with a distinctly tuffaceous matrix; showing sub parallel orientation of the large biotite flakes, some of which are deeply embedded in the analcite crystals. The medium toned gray matrix is chalcedony. From a bed in the north wall of White River canyon, T. 1 N., R. 103 W., enlarged 80 diameters. Rio Blanco County, Colorado. 1927. Plate 2-A in U.S. Geological Survey. Professional paper 158. 1930.
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Overturned and broken head of the pitted reef shown in Bradley photo 165, this shows near the hammer head a hole that contained the nucleus. It also shows the eccentric growth layers, which may be annual, and near the top of head (lower edge of photograph near the center) several open pit tubes. These are indistinct, partly because they are weathered and partly also because they are somewhat overgrown with algal deposits as the reef formed. Moffat County, Colorado. August 2, 1925. Plate 39-A in U.S. Geological Survey. Professional paper 154. 1929.
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Isolated algal head with digitate spongy structure; resembles in form and sculpturing the marine Lithothamnion, natural size. See also Bradley 247 and 248. Specimen is from Hells Canyon, sec. 22 T. 10 S., R. 25 E. Uintah County, Utah. September 15, 1925. Plate 41-B in U.S. Geological Survey. Professional paper 154. 1929.
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Photomicrograph of typical lobate colony of chlorellopsis coloniata reis: showing the vague layering of the unicells. Enlarged 10 diameters. From the Tipton tongue of the Green River formation, NE cor. sec. 1, T. 24 N., R. 100 W: Sweetwater County, Wyoming. 1923. Plate 32-B in U.S. Geological Survey. Professional paper 154. 1929.
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Microfossil of the oil shale of the Green River formation: Microspora sp. cf. M. pachyderma (Wille) Lagerheim. Colorado or Utah. 1925. Plate 21, figure 7, U.S. Geological Survey. Professional paper 168. 1931.
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Microfossil of the oil shale of the Green River formation: Chain of conidia resembling those of several genera of Hyphomycetes.
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Microfossil of the oil shale of the Green River formation: larva of Tabanidae. Colorado or Utah. 1927. Plate 28, figure 1, U.S. Geological Survey. Professional paper 168. 1931.
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Microfossil of the oil shale of the Green River formation: Quadrula minuta Bradley, n.sp. Colorado or Utah. 1925. Plate 25, figure 7, U.S. Geological Survey. Professional paper 168. 1931.
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Thin section of a rich oil shale showing several relatively large concretions and an abundance of minute concretions, all of micro granular carbonates; enlarged 10 times. Rio Blanco County, Colorado. July 27, 1925. Plate 17-A, U.S. Geological Survey. Professional paper 168. 1931.
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Microfossil of the oil shale of the Green River formation: spiral thickening of a tracheid. Colorado or Utah. 1925. Plate 24, figure 5, U.S. Geological Survey. Professional paper 168. 1931.
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Microfossil of the oil shale of the Green River formation: spore of Pestalozzia. sp? enlarged 1130 times. Colorado or Utah. 1925. Plate 19, figure 3, U.S. Geological Survey. Professional paper 168. 1931.
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Cup shaped, ringed pits in the upper surface of a Chlorellopsis reef, showing their general uniformity of size and arrangement. At the left they are arranged in fairly definite row. The vermiculate surface between the pits shows best in a small area a little to the right of the center. Moffat County, Colorado. August 1, 1925. Plate 38-B in U.S. Geological Survey. Professional paper 154. 1929.
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Microfossil of the oil shale of the Green River formation: group of spores suggesting sorus of Uromyces. sp. Colorado or Utah. 1925. Plate 20, figure 8, U.S. Geological Survey. Professional paper 168. 1931.
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Polished vertical section of a digitate algae reef; showing nuclei of dense cream colored limestone and two distinct stages of growth. The light gray finely speckled material between the columns of algal deposit is fine-grained limy sandstone: natural size. Specimen is from Hells Canyon, sec. 22 T. 10 S., R. 25 E. Uintah County, Utah. September 15, 1925. Plate 42-B in U.S. Geological Survey. Professional paper 154. 1929.
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Photomicrograph of part of an algae reef: showing thin radial limes of medium grained calcite, which may be casts of filamentous algae. The matrix is a spongy algal deposit of microcrystalline calcite, enlarged 21 diameters. Compare with Bradley photo 251. Center portion is plate 34-B in U.S. Geological Survey. Professional paper 154. 1929.
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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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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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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.
map background search result map search result map Microfossil of the oil shale of the Green River formation: Microspora sp. cf. M. pachyderma (Wille) Lagerheim. Colorado or Utah. 1925. Microfossil of the oil shale of the Green River formation: Quadrula minuta Bradley, n.sp. Colorado or Utah. 1925. Cup shaped, ringed pits in the upper surface of a Chlorellopsis reef. Moffat County, Colorado. 1925. Overturned and broken head of the pitted reef. Moffat County, Colorado. 1925. Bedding plane of brown organic marlstone covered with large Spinose fly larvae, lithohypoderma sp. from Uintah County, Utah. 1925. Polished vertical section of a compound algal head. Sweetwater County, Wyoming. 1923. Isolated algal head with digitate spongy structure. Uintah County, Utah. 1925. Photomicrograph of typical lobate colony of chlorellopsis coloniata reis. Sweetwater County, Wyoming. 1923. Confervites Mantiensis and associated coprolites. Sanpete County, Utah. 1925. Polished vertical section of a digitate algae reef. Uintah County, Utah. 1925. Microfossil of the oil shale of the Green River formation. Colorado or Utah. 1925. Microfossil of the oil shale of the Green River formation: larva of Tabanidae. Colorado or Utah. 1927. Confervites Mantiensis and associated coprolites. Sanpete County, Utah. 1925. Cup shaped, ringed pits in the upper surface of a Chlorellopsis reef. Moffat County, Colorado. 1925. Overturned and broken head of the pitted reef. Moffat County, Colorado. 1925. Bedding plane of brown organic marlstone covered with large Spinose fly larvae, lithohypoderma sp. from Uintah County, Utah. 1925. Isolated algal head with digitate spongy structure. Uintah County, Utah. 1925. Polished vertical section of a digitate algae reef. Uintah County, Utah. 1925. Polished vertical section of a compound algal head. Sweetwater County, Wyoming. 1923. Photomicrograph of typical lobate colony of chlorellopsis coloniata reis. Sweetwater County, Wyoming. 1923. Microfossil of the oil shale of the Green River formation: Microspora sp. cf. M. pachyderma (Wille) Lagerheim. Colorado or Utah. 1925. Microfossil of the oil shale of the Green River formation: Quadrula minuta Bradley, n.sp. Colorado or Utah. 1925. Microfossil of the oil shale of the Green River formation. Colorado or Utah. 1925. Microfossil of the oil shale of the Green River formation: larva of Tabanidae. Colorado or Utah. 1927.