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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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Sequoia National Park, California. The largest and most perfectly formed avalanche chute in the park, viewed from the High Sierra Trail east of the camp in Bearpaw Meadow. Like its smaller companion, this chute is carved in massive exfoliating granite and terminates at the brink of the glacial U-shaped canyon below. The downward narrowing of the chute is explained by the protection given to the lower part of the chute by a snow cone on the surface of the glacier which lays in the canyon. Circa 1935. Frontispiece, U.S. Geological Survey Professional paper 504-A.
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Sequoia National Park, California. East face of Mount Hitchcock. The entire mountain has a vertically sheeted structure, and infiltration of water and consequent frost action are facilitated along the weaker zones. There the rock is split into thin plates and slivers; the fragments loosened by frost are then swept down by avalanches. These chutes stand in marked contrast to those shown in photo mfe01060, which are not controlled by fractures but are worn in massive granite. Circa 1935. Figure 50, U.S. Geological Survey Professional paper 504-A.
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Sequoia National Park, California. West across the canyon of Marble Fork Kaweah River, showing one of the great cliffs of white marble from which the stream takes its name. The cliff is cut from a vertical bed of marble transected by the canyon. To the left of the marble bed are thin beds of various dark-hued metamorphic rocks. All of these strata are the stubs of a huge fold that probably once rose to a height of several thousand feet, but whether the upper portion of the fold (anticline) lay to the right or left is unknown. Circa 1935.
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Sequoia National Park, California. 70-foot block of granite in the bed of the Kaweah River near Hospital Rock. 1935.
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Sequoia National Park, California. East end of Tunnel Rock fly road construction. Circa 1935.
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Sequoia National Park, California. Sheer cliffs 2,000 to 2,400 feet high, north of Hamilton Lake (just out of view). At the lower right is a stretch of the trail leading to Kaweah Gap. The cliffs owe their remarkable columnar forms mainly to a vertically sheeted structure, which has permitted the incision of sharp gullies along narrow zones of intense fracturing. The erosional work has been done by avalanches of snow and by water from rain and snow carrying loosened rock grains. The white cliff on the right is composed of wholly undivided massive granite.
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Sequoia National Park, California. Concrete steps have been built along the broken edge of the curving top shell of Moro Rock. This shell is already cracked in a number of places, and some of the fragments have slid a short distance as a result of gravity and pressure exerted by ice forming in the fractures. Circa 1935.
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Sequoia National Park, California. The most perfectly formed avalanche chute in the park, viewed from the High Sierra Trail east of the camp in Bearpaw Meadow. This chute is carved in massive exfoliating granite and terminates at the brink of the glacial U-shaped canyon below. The downward narrowing of the chute is explained by the protection given to the lower part of the chute by a snow cone on the surface of the glacier which lays in the canyon. Meltwater cascading from the snow in the chute has carved a gulch beneath it. The scales on the granite in the chute are produced by exfoliation and are purely superficial features. 1936.
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Sequoia National Park, California. West from Moro Rock along the cliffs bordering the platform on which the Giant Forest stands. Part of the Giant Forest is seen at the right. The cliffs are of sparsely jointed granite that is exfoliating very slowly and rather irregularly. Similar massive granite outcrops elsewhere on the platform indicate that the whole platform is made up largely of this durable material. It is, no doubt, to this circumstance that the platform, a remnant of an ancient erosion surface, owes its preservation. Circa 1935. Figure 7, U.S. Geological Survey Professional paper 504-A.
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Sequoia National Park, California. Up the unglaciated lower part of Kaweah River canyon toward the platform on which the Giant Forest stands. Moro Rock (right) owes its prominence in the landscape to the fact that it is composed of massive granite. The platform is also held up mainly by massive granite, but the mountain slopes below have been eroded from normally jointed rocks, partly granitic, partly metamorphic. Circa 1935. Figure 6, U.S. Geological Survey Professional paper 504-A.
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Sequoia National Park, California. Branching avalanche chutes on the west flank of Mount Whitney. Some of the chutes are more than 100 feet deep. Their cutting has been facilitated by the thoroughly jointed structure of the granite. In some places, they are controlled by vertical master joints, but elsewhere they cross these fractures at various angles. Exposure to the afternoon sun has promoted melting of snow in these chutes, and running water has, therefore, played a more important part in modifying their form than it has on the shady north face of Mount Hitchcock. 1935.
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Sequoia National Park, California. Up the valley of Tyndall Creek from the Bighorn Plateau, which appears in the lower right foreground. The flat-topped peak in the right center is Diamond Mesa. The barren ridges of rock debris extending toward the lower left corner are lateral moraines of the Wisconsin Stage. The uppermost moraine marks the highest level reached by the Tyndall Glacier during that stage. The lower, timber-covered moraines were laid down during the recession of the glacier. The smooth slope of the Bighorn Plateau seems devoid of glacial features, yet in places it bears scattered erratic boulders left from El Portal Stage. Circa 1935. Figure 42, U.S. Geological Survey Professional paper 504-A.
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Sequoia National Park, California. Levees of rock grains at the sides of a Rain water rill near Wright Creek. Circa 1935. Photos mfe01204 and mfe01205 form a panorama.
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Sequoia National Park, California. West end of Tunnel Rock after completion of the fly road. Circa 1935.
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Sequoia National Park, California. Glacial boulder split by frost action, on a lateral moraine of Wisconsin stage, from Rock Creek Glacier on the north edge of Siberian Outpost. Circa 1935.
map background search result map search result map West from Moro Rock along the cliffs bordering the platform on which the Giant Forest stands. Sequoia National Park, California. Glacier polish, striae, and grooves above the head of Kern Canyon. Sequoia National Park, California. 1935. Avalanche chute. Sequoia National Park, California. 1935. Up the valley of Tyndall Creek from the Bighorn Plateau. Sequoia National Park, California. 1935. East face of Mount Hitchcock. Sequoia National Park, California. 1935. Up the unglaciated lower part of Kaweah River canyon toward the platform on which the Giant Forest stands. Sequoia National Park, California. 1935 Sheer cliffs 2,000 to 2,400 feet high, north of Hamilton Lake (just out of view). Sequoia National Park, California. No Date. Branching avalanche chutes on the west flank of Mount Whitney. Sequoia National Park, California. Solution cavities in granite at Sunset Rock. Sequoia National Park, California. 1935. Glacial boulder split by frost action, on a lateral moraine of Wisconsin stage. Sequoia National Park, California. 1935. Levees of rock grains at the sides of a Rain water rill near Wright Creek. Sequoia National Park, California. 1935. West across the canyon of Marble Fork Kaweah River. Sequoia National Park, California. 1935. Hospital Rock. Sequoia National Park, California. Circa 1935. Moro Rock, viewed from Hospital Rock. Sequoia National Park, California. 1935. Concrete steps have been built along the broken edge of the curving top shell of Moro Rock. Sequoia National Park, California. 1935. Avalanche chute. Sequoia National Park, California. 1936. 70-foot block of granite in the bed of the Kaweah River near Hospital Rock. Sequoia National Park, California. 1935. West end of Tunnel Rock after completion of the fly road. Sequoia National Park, California. 1935. East end of Tunnel Rock fly road construction. Sequoia National Park, California. 1935. Tunnel Rock. Sequoia National Park, California. Circa 1935. West from Moro Rock along the cliffs bordering the platform on which the Giant Forest stands. Sequoia National Park, California. Glacier polish, striae, and grooves above the head of Kern Canyon. Sequoia National Park, California. 1935. Avalanche chute. Sequoia National Park, California. 1935. Up the valley of Tyndall Creek from the Bighorn Plateau. Sequoia National Park, California. 1935. East face of Mount Hitchcock. Sequoia National Park, California. 1935. Up the unglaciated lower part of Kaweah River canyon toward the platform on which the Giant Forest stands. Sequoia National Park, California. 1935 Sheer cliffs 2,000 to 2,400 feet high, north of Hamilton Lake (just out of view). Sequoia National Park, California. No Date. Branching avalanche chutes on the west flank of Mount Whitney. Sequoia National Park, California. Solution cavities in granite at Sunset Rock. Sequoia National Park, California. 1935. Glacial boulder split by frost action, on a lateral moraine of Wisconsin stage. Sequoia National Park, California. 1935. Levees of rock grains at the sides of a Rain water rill near Wright Creek. Sequoia National Park, California. 1935. West across the canyon of Marble Fork Kaweah River. Sequoia National Park, California. 1935. Hospital Rock. Sequoia National Park, California. Circa 1935. Moro Rock, viewed from Hospital Rock. Sequoia National Park, California. 1935. Concrete steps have been built along the broken edge of the curving top shell of Moro Rock. Sequoia National Park, California. 1935. Avalanche chute. Sequoia National Park, California. 1936. 70-foot block of granite in the bed of the Kaweah River near Hospital Rock. Sequoia National Park, California. 1935. West end of Tunnel Rock after completion of the fly road. Sequoia National Park, California. 1935. East end of Tunnel Rock fly road construction. Sequoia National Park, California. 1935. Tunnel Rock. Sequoia National Park, California. Circa 1935.