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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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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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Arvin-Tehachapi earthquake damage along the Southern Pacific Railroad near Bealville. Sharp bend in the tracks south of Tunnel 3 strikingly demonstrates that the ground had been shortened in this area. A landslide blocks the east portion of tunnel 3. Kern County, California. 1952. Published in California Department of Natural Resources, Division of Mines, Bulletin 171, Figure 6, pt. 1, contribution 7. 1955.
Categories: Image;
Tags: Arvin-Tehachapi earthquake,
Kern County, California,
Kupker, D.H. Collection,
Mills, Mines, Quarries,
Photographers, All tags...
photo print, Fewer tags
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Color layering in a thick textural layer of light-colored sodic granite in the Calamity Peak mass. The dark layers are mostly quartz and the light layers are mostly feldspar. The pick is 14 inches long. Custer County South Dakota. Published in U. S. Geological Survey Bulletin 1142-E. 1963.
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