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Panoramic view from the summit of Custer Peak. Black Hills. This view shows the distribution of the parks and woods about Custer. Panoramic view includes Photo #388, 389, 390, 391, 392, and 393. Custer County, South Dakota. September 1897.
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Pyrite in matrix of nodule bed. At upper left is the border of relatively large nodule in bed. At lower left is an area clouded with iron oxides. Note small nodules in lower center. Elongated objects lower right are fragments of fish bone in matrix. Enlargement X 40. Smoothed surface photographed in green light. Custer County, South Dakota. circa 1967. (Photomicrograph) Published as figure 9 in U.S. Geological Survey Professional Paper 594-L. 1968.
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Forest through which fire has run. 7 Miles east of Custer. Black Hills. Custer County, South Dakota. September 1897.
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Contact between Niobrara Formation (above) and Carlile Shale (below) at a locality about k miles south of Fairburn in the NW 1/4, SE 1/4, sec. 13, T. 5 S., R. 7 E. The phosphate nodules are in the bed at the head of the hammer. The matrix of the bed consists of pyrite, mostly oxidized to yield iron oxides and gypsum. Custer County, South Dakota. Circa 1967. Published as figure 3 in U. S. Geological Survey Professional Paper 594-L. 1968.
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Young growth of pines starting up in an area where a fire has swept through the forest, 7 miles east of Custer, Black Hills. Custer County, South Dakota. September 1897.
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Pelagic foraminifer replaced by barite and filled with apatite and pyrite. Fragments of other foraminifer tests also are visible. Globular body at left is a section of either a foraminifer chamber or a radiolarian filled with barite and containing two pyrite crystals. Enlargement X 100. Custer County, South Dakota, ca. 1967. (Photomicrograph) Middle portion published as plate 2, figure 7 in U. S. Geological Survey. Professional paper 594-L. 1968.
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Textural layering in the Calamity Peak mass of granite-pegmatite complex. Tape line indicates line of samples from location B. The average thickness of the layers in 3 inches. Custer County, South Dakota. Circa 1949. Published in U.S. Geological Survey, Bulletin 1142-E. 1963.
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Young growth of pines starting up in an area where a fire has swept through the forest, 7 miles east of Custer, Black Hills. Custer County, South Dakota. September 1897.
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Contact of pegmatite and gneiss in northeast face of open cut at Firestone Mica mine, near Custer. Custer County, South Dakota. Before 1923. Plate 28-A in U.S. Geological Survey. Bulletin 740. 1923.
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View of pegmatite rocks on Sylvan Lake, 6 miles north northeast of Custer, Black Hills. Custer County, South Dakota. September 1897.
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Young growth of pines starting up in an area where a fire has swept through the forest, 7 miles east of Custer, Black Hills. Custer County, South Dakota. September 1897.
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Very large wrinkles (forming stairway in photograph) in schist in the northern part of the area. The main schistosity and the bedding strike north 60 degrees west and dip 50 degrees southwest (parallel to the crests of the wrinkles). A second schistosity is developed locally that strikes north 67 degrees east and dips 40 degrees northwest (parallel to the axial planes of the Wrinkles). The geologic pick rests on a sinuous quartz vein about 1 inch thick that follows the crenulations of wrinkles. The knobby character of the schist is caused by quartz-sillimanite knots. Custer County South Dakota. Published in U. S. Geological Survey Bulletin 1142-E. 1963.
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Panoramic view from the summit of Custer Peak. Black Hills. This view shows the distribution of the parks and woods about Custer. Panoramic view includes Photo #388, 389, 390, 391, 392, and 393. Custer County, South Dakota. September 1897.
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View of pegmatite rocks on Sylvan Lake, 6 miles north northeast of Custer, Black Hills. Custer County, South Dakota. September 1897.
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End of intrusion of small dike of pegmatite at Crown Mica mine, near Custer. Custer County, South Dakota. Before 1923. Plate 27-B in U.S. Geological Survey. Bulletin 740. 1923.
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Part of cross section of nodule-bed specimen. Specimen from locality pictured in photo no. tah00033. Most of the ooids are replaced with pyrite. The veins in the nodules are filled mostly with pyrite that extends into the matrix. Calcite incorporates pyrite in some parts of the veins, and some of the pyrite has altered to gypsum. The light-gray mineral surrounding fragments at the lower left of the nodule is pyrite. Custer County, South Dakota, ca. 1967. Published as figure 7 in U. S. Geological Survey. Professional paper 594-L. 1968.
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View of pegmatite rocks on Sylvan Lake, 6 miles north northeast of Custer, Black Hills. Custer County, South Dakota. September 1897.


map background search result map search result map Textural layering in the Calamity Peak mass of granite-pegmatite complex. Custer County, South Dakota. Circa 1949. Contact between Niobrara Formation (above) and Carlile Shale (below). Custer County, South Dakota. Circa 1967. Part of cross section of nodule-bed specimen. Custer County, South Dakota. 1967. Pyrite in matrix of nodule bed. Custer County, South Dakota. circa 1967. Pelagic foraminifer replaced by barite and filled with apatite and pyrite. Custer County, South Dakota. 1967. Panoramic view from the summit of Custer Peak. Custer County, South Dakota. 1897. Panoramic view from the summit of Custer Peak. Custer County, South Dakota. 1897. Farm in park, 5 miles west southwest of Custer, Black Hills. Custer County, South Dakota. 1897. Farm in park, 5 miles west southwest of Custer, Black Hills. Custer County, South Dakota. 1897. WMR 053 - Bellemare and Wildwood Pegmatites. Custer County, South Dakota. 1943. Textural layering in the Calamity Peak mass of granite-pegmatite complex. Custer County, South Dakota. Circa 1949. Contact between Niobrara Formation (above) and Carlile Shale (below). Custer County, South Dakota. Circa 1967. Part of cross section of nodule-bed specimen. Custer County, South Dakota. 1967. Pyrite in matrix of nodule bed. Custer County, South Dakota. circa 1967. Pelagic foraminifer replaced by barite and filled with apatite and pyrite. Custer County, South Dakota. 1967. Panoramic view from the summit of Custer Peak. Custer County, South Dakota. 1897. Panoramic view from the summit of Custer Peak. Custer County, South Dakota. 1897. Farm in park, 5 miles west southwest of Custer, Black Hills. Custer County, South Dakota. 1897. Farm in park, 5 miles west southwest of Custer, Black Hills. Custer County, South Dakota. 1897. WMR 053 - Bellemare and Wildwood Pegmatites. Custer County, South Dakota. 1943.