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El Capitan from south, the cliff of El Capitan lies near the center, with Guadalupe Peak concealed behind it. Numbers (on published photo; progressing down the mountain) refer to original section by Shunard; White limestone (Capitan); upper dark limestone (Pinery); yellow sandstone (Delaware Mountain); basal black limestone (Bone Spring). Letters (on published photo progressing downward) refer to Quaternary deposits; older slope deposits; younger slope deposits: Oblique aerial photo by U.S. Army Air Corps. Culberson County, Texas. Circa 1945. Plate 1, in U.S.Geological Survey Professional paper 215. 1948.
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Laminated sediments of Permian age, the laminations may be varves or annual deposits; thin sections, in transmitted light: Black limestone of Bone Spring, several hundred feet above base, from Sierra Diablo scarp north of Victorio Canyon. Culberson County, Texas. Circa 1934. Plate 10-A, in U.S.Geological Survey Professional paper 215. 1948.
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Some fossils from Guadalupe Mountains: natural size; Pisolites, probably in part of algal origin, from Carlsbad limestone. Culberson County, Texas. Circa 1934. Plate 19-A, in U.S.Geological Survey Professional paper 215. 1948.
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Laminated sediments of Permian age, the laminations may be varves or annual deposits; thin sections, in transmitted light: anhydrite of Castle formations, on road to 9 K ranch 4 miles south of U.S. Highway no. 62. Texas. Circa 1934. Plate 10-B, in U.S.Geological Survey Professional paper 215. 1948.
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Structural features in Black limestone of Bone Spring: Contorted beds in ravine 3.5 miles south-southeast of El Capitan, note recumbent folds and vertical joints. Photo by J.B. Knight. Culberson County, Texas. Circa 1934. Plate 11-B, in U.S.Geological Survey Professional paper 215. 1948.