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Photomicrograph showing detail of the varves in the rich oil shale specimen in Bradley photo 321; the organic laminae indicated by marks are themselves finely laminated. The mineral laminae contain considerable organic matter, but they are readily distinguished by their coarser grain and greater thickness. Enlarged 320 diameters. Garfield County, Colorado. 1927. Plate14-A in U.S. Geological Survey. Professional paper 158. 1930.
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Specimen of moderately rich oil shale showing fine laminations and the characteristic loop bedding. The zone a little below the center is most typical and represents the edges of polygons formed by sun cracks. From east fork of Parachute Creek T.5 S., R. 95 W. Garfield County, Colorado. 1924. Plate 17-B in U.S. Geological Survey. Professional paper 168. 1931.
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Album caption: View in Bryce Canyon from rim. Bryce Canyon National Park, Utah. July 19, 1925. (Panorama with photo no. 156). No index card. Note: Panorama with bwh00156
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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 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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Microfossil of the oil shale of the Green River formation: Pollen similar to that of Quercus pinus. Colorado or Utah. 1925. Plate 24, figure 4, U.S. Geological Survey. Professional paper 168. 1931.
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Upper surface of a tabellate reef with spongy surface; each molariform head is more or less columnar in section, though many of them are very irregular and complexly intergrown; 75% of natural size. Specimen is from about 530 feet above the base of the Green River formation on the divide between Douglas and East Salt Creeks. Garfield County, Colorado. August 18, 1925. Plate 43-A in U.S. Geological Survey. Professional paper 154. 1929.
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Varves in organic marlstone from a bed about 1800 feet above the base of the Green River formation on Clear Creek in sec. 9, T. 5 S., R. 98 W. The darker bands of rock contain the most organic matter. Magnified 4 times. Garfield County, Colorado. 1927. Plate 11 in U.S. Geological Survey. Professional paper 158. 1930.
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Recent algal deposit from Green Lake, the upper rough part is grayish green, owing to the dense felt algae, whose tips were only incrusted with lime. The lower, smoother part, which was buried in a soft limy mud is yellowish gray, dense and without living algae. Onondaga County, New York. July 1926. Plate 29-B in U.S. Geological Survey. Professional paper 154. 1929.
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Photomicrograph showing the association of the three principal types of structure found in the algae reefs of the Green River formation; small area of the reef shown in Bradley photo 209. In the lower right hand quarter is colony of the large spherical cells of Chlorellopsis colonata Reis, above that is a thick zone of typical spongy deposit, and at the top and also down the left side is an inorganic incrustation. Enlarged 10 diameters. From the Tipton tongue of the Green River formation, sec. 21, T. 4 N., R. 101 W: Sweetwater County, Wyoming. 1923. Top half is plate 34-A in U.S. Geological Survey. Professional paper 154. 1929.
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Large pitted reef consisting of separate closely spaced, turbinate heads which rest upon a bed of smaller algal nodules. The nodule bed rest upon medium grained massive sandstone that is locally cross-bedded. The second and third heads to the left of man show fluting. The minimum time required for the formation of this reef is estimated at 355 years. Moffat County, Colorado. August 2, 1925. Plate 40-A in U.S. Geological Survey. Professional paper 154. 1929.
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Microfossil of the oil shale of the Green River formation: larva of Chironomidae. Colorado or Utah. 1927. Plate 28, figure 1 and 3, U.S. Geological Survey. Professional paper 168. 1931.
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Microfossil of the oil shale of the Green River formation: spores resembling those of Macrosporuim. sp. Colorado or Utah. 1925. Plate 20, figure 9, U.S. Geological Survey. Professional paper 168. 1931.
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Specimen of mosaic breccia in oil shale showing the contrast on a weathered surface between the flakes of very rich oil shale and the slightly less rich matrix; Uintah County, Utah. September 10, 1925. Plate 15-A, U.S. Geological Survey. Professional paper 168. 1931.
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Lower sandy part of the Bridger formation resting in evident conformity on the Green River formation, approximately in sec. 21, T. 11 S., R. 17: boundary of formation is about one third of the way up from bottom on the left side extending across to a slightly lower position on the right. Duchesne County, Utah. September 6, 1925. Plate 12-B, with graphics, U.S. Geological Survey. Professional paper 168. 1931.
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Large lens of oil shale and organic marlstone in the muddy sandstone of the delta facies of the Green River formation; by differential compaction the top of this lens (upper right) has been depressed several feet below its original position: Near the boundary between Duchesne and Uintah Counties, Utah. September 9, 1925. Plate 10-A, with graphics, U.S. Geological Survey. Professional paper 168. 1931.
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North across Henrys Fork, showing the south end of Cedar Mountain with its thick capping of the Bishop conglomerate, which contains a huge lens of coarser grained material that weathers into columnar forms. Below the conglomerate are tuffaceous beds of the Bridger formation. Sweetwater County, Wyoming. 1930. Plate 37-A, U.S.Geological Survey Professional paper 185-I. 1936.
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Microfossil of the oil shale of the Green River formation: Zygospore, perhaps desmid. Colorado or Utah. 1925. Plate 23, figure 4, U.S. Geological Survey. Professional paper 168. 1931.
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Polished vertical section of a reef formed of recumbent discoid colonies of Chlorellopsis coloniata Reis. The colonies near the center and upper parts of the specimen show faintly the concentric growth layers, which are convex outward along the radii of the colonies, natural size. Specimen is from 3700 feet above the base of the Green River formation on the west side of the Duchesne-Price mail road; T.6 S, R.7 W. Duchesne County, Utah. August 31, 1925. Plate 41-A in U.S. Geological Survey. Professional paper 154. 1929.
map background search result map search result map Microfossil of the oil shale of the Green River formation: spores resembling those of Macrosporuim. Colorado or Utah. 1925. Microfossil of the oil shale of the Green River formation: Zygospore, perhaps desmid. Colorado or Utah. 1925. Lower sandy part of the Bridger formation resting in evident conformity on the Green River formation. Duchesne County, Utah. 1925. View in Bryce Canyon from rim. Bryce Canyon National Park, Utah. 1925. Large pitted reef consisting of separate closely spaced, turbinate heads. Moffat County, Colorado. 1925. Large lens of oil shale and organic marlstone in the muddy sandstone of the delta facies of the Green River formation. Duchesne and Uintah Counties, Utah. 1925. Specimen of mosaic breccia in oil shale. Uintah County, Utah. 1925. Recent algal deposit from Green Lake. Onondaga County, New York. 1926. Polished vertical section of a reef formed of recumbent discoid colonies of Chlorellopsis coloniata Reis. Duchesne County, Utah. 1925. Photomicrograph of typical physico-chemical incrustation of calcite. Sweetwater County, Wyoming. 1923. Photomicrograph showing the association of the three principal types of structure found in the algae reefs of the Green River formation. Sweetwater County, Wyoming. 1923. Microfossil of the oil shale of the Green River formation: Pollen similar to that of Quercus pinus. Colorado or Utah. 1925. Photomicrograph of a thin section of specimen from an analcite crystal bed. Uintah County, Utah. 1925. Microfossil of the oil shale of the Green River formation: larva of Chironomidae. Colorado or Utah. 1927. North across Henrys Fork, showing the south end of Cedar Mountain with its thick capping of the Bishop conglomerate. Sweetwater County, Wyoming. 1930. View in Bryce Canyon from rim. Bryce Canyon National Park, Utah. 1925. Recent algal deposit from Green Lake. Onondaga County, New York. 1926. Lower sandy part of the Bridger formation resting in evident conformity on the Green River formation. Duchesne County, Utah. 1925. Polished vertical section of a reef formed of recumbent discoid colonies of Chlorellopsis coloniata Reis. Duchesne County, Utah. 1925. Large pitted reef consisting of separate closely spaced, turbinate heads. Moffat County, Colorado. 1925. Specimen of mosaic breccia in oil shale. Uintah County, Utah. 1925. Photomicrograph of a thin section of specimen from an analcite crystal bed. Uintah County, Utah. 1925. Large lens of oil shale and organic marlstone in the muddy sandstone of the delta facies of the Green River formation. Duchesne and Uintah Counties, Utah. 1925. Photomicrograph of typical physico-chemical incrustation of calcite. Sweetwater County, Wyoming. 1923. Photomicrograph showing the association of the three principal types of structure found in the algae reefs of the Green River formation. Sweetwater County, Wyoming. 1923. North across Henrys Fork, showing the south end of Cedar Mountain with its thick capping of the Bishop conglomerate. Sweetwater County, Wyoming. 1930. Microfossil of the oil shale of the Green River formation: spores resembling those of Macrosporuim. Colorado or Utah. 1925. Microfossil of the oil shale of the Green River formation: Zygospore, perhaps desmid. Colorado or Utah. 1925. Microfossil of the oil shale of the Green River formation: Pollen similar to that of Quercus pinus. Colorado or Utah. 1925. Microfossil of the oil shale of the Green River formation: larva of Chironomidae. Colorado or Utah. 1927.