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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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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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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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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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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.
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Upper part of Evacuation Creek member in east wall of Evacuation Creek Canyon in sec. 8 T. 10 S., R. 25 E. Salt Lake meridian; shows numerous ellipsoidal cavities formed by the growth of bladed aggregates of an unknown salt while the beds were still plastic. Uintah County, Utah. September 6, 1925. Plate 5-A, U.S. Geological Survey. Professional paper 168. 1931.
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Southwest across the valley of Minnie Maud Creek; the remarkably flat bench is the top of the Horse Bench sandstone lentil. The inner canyon of Minnie Maud Creek is cut into the sandy deltaic facies of the Green River formation, and the principal oil-shale group is just below the rim of the inner canyon. The road in the foreground furnishes a scale: Near the boundary between Duchesne and Uintah Counties, Utah. September 9, 1925. Plate 9-B, U.S. Geological Survey. Professional paper 168. 1931.
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Mud cracked organic marlstone bed from Indian Canyon; small calcite pseudomorphs of a salt, probably glauberite, fill the cracks. Note the marked convexity of the polygon surfaces. Duchesne County, Utah. September 2, 1925. Plate 10-B, U.S. Geological Survey. Professional paper 168. 1931.