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Yosemite National Park, California. Yosemite Falls and surrounding cliffs, viewed from the valley floor. Only the head of Lower Yosemite Fall is visible through the trees. Dark zones of vegetation crossing the cliffs on the left reveal narrow terraces developed along zones of sheared rock. Sparseness of vegetation in the intermediate spaces is indicative of the absence of joints in the rock. Circa 1913.
Yosemite National Park, California. Bold exposure of unjointed Half Dome Granodiorite (in sun) capped by mostly well-jointed tonalite (in shade) making up Glacier Point. The contact between the two rock types angles upward to the left. Figure 38, U.S. Geological Survey Bulletin 1595.
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Huber, N.K. Collection,
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Northeastward from Granite Dome. The rock-basin lake is in granite. The visible parts of the ridges beyond are of volcanic rock. California. 1905.
Yosemite National Park, California. Three-quarters profile view of Royal Arches, showing the inclination of rock sheets and in-curving of partings under the edge of the rock terrace, a feature characteristic of exfoliation. Half Dome in the background. Circa 1913.
Sequoia National Park, California. Glacier polish, striae, and grooves above the head of Kern Canyon. The rock is aplite, which weathers more slowly than the coarser granite and, therefore, holds its glacial markings longer. Since being glaciated, the aplite has been somewhat disrupted into angular blocks by repeated frost action. Circa 1935. Figure 23, U.S. Geological Survey Professional paper 504-A.
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photo print
Yosemite National Park, California. Glaciated floor and side of upper Merced Canyon. All the rock features shown are smoothed and polished by the ice. In few places in the world is glacier polish more abundant than here. The row of stones in the foreground serves to mark the trail across the otherwise featureless rock floor. Circa 1914. Plate 36, U.S. Geological Survey Professional paper 160.
Yosemite National Park, California. Exfoliating granite on Lower Quarter Dome. This rock mass originally had angular edges and a sharp point, but these are now largely transformed into smooth curves of exfoliation. Circa 1913. Plate 48-C, U.S. Geological Survey Professional paper 160.
Yosemite National Park, California. Glaciated rock between Mono Pass and Parker Pass. The direction of ice motion was from the foreground on the right toward the distance on the left. An angular cavity, due to the plucking of a block separated by joint planes, was modified by subsequent abrasion. The hill beyond is a spur of Mount Gibbs. 1903.
Death Valley National Park, California. West distributary of Salt Creek where it crosses the smooth silty rock to the flood plain in Cottonball Basin. This channel is 32 feet wide and 1 foot deep. Much of the efflorescence on the channel upstream from the pool is mirabilite, the hydrous sodium sulfate. Circa 1960.
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Hunt, C.B. Collection,
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Sequoia National Park, California. Down the canyon across one of the Hamilton Lakes, viewed from near the source of Hamilton Creek. Massive granite forms the impressive cliffs on the right and the rock barrier across which the lake has its outlet. In the center, on the distant mountain, is a well-formed avalanche chute. Photo by W.L. Huber, circa 1935. Figure 35, U.S. Geological Survey Professional paper 504-A.
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Tags: California,
Huber, W.L. Collection,
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Sequoia National Park,
Yosemite National Park, California. Up Hetch Hetchy Valley from the trail to Lake Eleanor. Kolana Rock on the right. North Dome on the left. Circa 1914.
Yosemite National Park, California. Perched erratic deposited on the ridge west of Upper Yosemite Fall during a pre-Tahoe glaciation. Pedestal height of 5 feet indicates the amount of rock weathered away since the boulder was dropped by the ice. Photo by U.S. National Park Service. Figure 66, U.S. Geological Survey Bulletin 1595.
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Tags: California,
Huber, N.K. Collection,
National parks,
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Yosemite National Park,
Album caption: Detail view of another part of the ice-scoured rock floor of Evolution Basin, near Sapphire Lake. In foreground, a series of crescentic gouges; beyond, two series of curved tension cracks. To the right some perfect gouges. Handwritten notes on album caption: Fresno County, California, 1921; Kings Canyon National Park, California. Index card: Matthes, F. E. 574: Detail view of part of the ice-soured rock floor of Evolution Basin, near Sapphire Lake. In foreground, a series of crescentic gouges; beyond, two series of curved tension cracks. To the right some imperfect gouges. Kings Canyon National Park, Fresno County, California, 1921. Note: The Francois E. Matthes' papers and field notebooks...
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Death Valley National Park, California. Concentric rings of the Death Valley salt pan. View is northwest from Dantes View. Badwater is in the lower left corner. Gypsum in the sulfate zone forms the crescentic deposit in the lower left center. Rock salt of the chloride zone extends over several square miles in the left center. Shoreline features of the Holocene lake that deposited the salts are plainly seen cutting across the toes of the fans on the far side of the valley. Photo by H.E. Malde, circa 1960.
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Tags: California,
Death Valley National Park,
Malde, H.E. Collection,
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Seismology and Seismometry. Helicorders monitor signals at a seismograph station at Berkley from stations in the University of California Seismographic Network. Photo by R. McKenzie. Earthquake Information Bulletin, v. 9, no. 3, back cover.
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Tags: California,
McKenzie, R. Collection,
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photo print
Yosemite National Park, California. Vernal Fall at low water, showing the massive character of the rock. There is not a single parting in the 300-foot cliff. No notch is cut by the stream. The cliff recedes by the scaling off of huge vertical rock sheets. In the lower right corner is a fragment of the last rock sheet that broke off. Circa 1913.
Yosemite National Park, California. Vernal Fall precipice at low water. In the foreground are characteristic current scoops developed in the massive rock. Beyond, a dark line of moss and grass reveals an incipient parting, developing parallel to the cliff face. Circa 1913.
Death Valley National Park, California. Volcanic rocks and sediments derived from them form the front of the Black Mountains at Artist Drive. Photo by J.R. Stacy, circa 1960.
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Tags: California,
Death Valley National Park,
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Stacy, J.R.Collection,
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This is a mammoth landslide that came off of Blackhawk Mountain, on the north side of the San Bernardino Mountains, an estimated 17,000 years ago. It is spread across the Lucerne Valley in Southern California. (Photo by Doc Searls)
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Tags: Blackhawk, California landslide,
California,
Highland, Lynn M. Collection,
Landslides,
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