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Isle Royale National Park, Michigan. Specimen from the Washington Island Flow. Ophitic texture is obscure, but characteristic dark chlorite splotches are visible. Circa 1971. Figure 16, U.S. Geological Survey Professional paper 754-C; Figure 25, U.S. Geological Survey Bulletin 1309.
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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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Yosemite National Park, California. Half Dome Granodiorite contains large, well-formed hornblende crystals. Figure 11-A, U.S. Geological Survey Bulletin 1595.
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Yosemite National Park, California. Weather pans (or pits) formed on the summit of North Dome, high above Yosemite Valley. Neighboring pans coalesce as a result of progressive expansion at the expense of intermediate partitions. Photo by U.S. National Park Service. Figure 45, U.S. Geological Survey Bulletin 1595.
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Yosemite National Park, California. Tenaya Lake in the middle distance, Tuolumne Meadows in the wooded area on the left, and Mount Dana the highest summit on the skyline. Photo by D.L. Peck. Cover, U.S. Geological Survey Bulletin 1595.
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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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Isle Royale National Park, Michigan. Tuff-breccia overlying the Greenstone Flow. Fragmental character is clearly evident in this outcrop, which is close to the base of the pyroclastic unit on the north shore of Tobin Harbor near Newman Island. The knife is 7 centimeters long. Circa 1971. Figure 20, U.S. Geological Survey Professional paper 754-C; Figure 20, U.S. Geological Survey Bulletin 1309.
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Yosemite National Park, California. Pothole Dome, a large roche moutonne on the west side of Tuolumne Meadows, was shaped by glacial smoothing and plucking. The ice moved from right (stoss side) to left (leeside). The fluted surface was shaped by subglacial water scour. Figure 70, U.S. Geological Survey Bulletin 1595.
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Yosemite National Park, California. Glacial till, an unsorted mixture of boulders, sand, and clay exposed along the Tioga Road at Siesta Lake. Figure 60, U.S. Geological Survey Bulletin 1595.
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Isle Royale National Park, Michigan. Chlorastrolite amygdules showing characteristic segmented pattern. Circa 1971. Figure 72, U.S. Geological Survey Bulletin 1309.
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Isle Royale National Park, Michigan. Slabby sandstone outcrop on Stone House Island. Circa 1971. Figure 28, U.S. Geological Survey Bulletin 1309.
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Yosemite National Park, California. West shoulder of Mount Hoffmann. Smooth, unglaciated south-facing slope (on the left) is abruptly truncated by a north- facing glacial cirque - a striking contrast in erosional processes. Figure 79, U.S. Geological Survey Bulletin 1595.
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Yosemite National Park, California. Crevassed ice of Dana Glacier is exposed in the left center, and the glacier's bergschrund is barely visible in the shadowed area above. Since the early part of the 20th century, the glacier has retreated headward from its terminal moraine, visible in the lower right. View is southwest. Photo by M.M. Clark. 1975. Figure 82, U.S. Geological Survey Bulletin 1595.
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Yosemite National Park, California. Schlieren - streaks or layers formed by the clustering of dark minerals during differential flow within the partially solidified magma. Note the parallel alignment of potassium feldspar phenocrysts by the same process. Larger phenocrysts are about 2 inches long. Figure 16, U.S. Geological Survey Bulletin 1595.
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Yosemite National Park, California. Tahoe moraine in the Harden Lake area, showing its subdued crest and only scattered boulders exposed on the surface. Figure 65, U.S. Geological Survey Bulletin 1595.
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Yosemite National Park, California. Road cut at Big Meadow Overlook on Big Oak Flat Road. Spheroidal weathering around corestones. Rectangular pattern of sheets reflects horizontal and vertical orientation of joints originally bounding the disintegrating blocks. Figure 44, U.S. Geological Survey Bulletin 1595.
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Yosemite National Park, California. The Rockslides and El Capitan. The Rockslides (left) is a jumbled collection of talus blocks of diorite, the most closely jointed rock in Yosemite Valley. In contrast, El Capitan (right) is largely unjointed granite, and the pile of debris at its foot, though concealed in this photograph, is comparatively small. Figure 37, U.S. Geological Survey Bulletin 1595.
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Yosemite National Park, California. Potholes angling up the side of Pothole Dome on the west side of Tuolumne Meadows. Bowl-shaped potholes are carved into the rock by the grinding action of stones whirled around and kept in motion by the force of a stream in a given spot. Here, the stream flowed into a tunnel beneath the ice that covered this area during the Tioga glaciation. Figure 71, U.S. Geological Survey Bulletin 1595.
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Isle Royale National Park, Michigan. Copper Harbor Conglomerate sloping gently southeast into Lake Superior near Attwood Beach. Circa 1971. Figure 26, U.S. Geological Survey Bulletin 1309.
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Isle Royale National Park, Michigan. Amygdaloid with calcite amygdules and calcite vein at top. Circa 1971. Figure 14, U.S. Geological Survey Bulletin 1309.


map background search result map search result map Yosemite National Park, California. Half Dome Granodiorite contains large, well-formed hornblende crystals. Isle Royale National Park, Michigan. Specimen from the Washington Island Flow. Ophitic texture is obscure, but characteristic dark chlorite splotches are visible. Circa 1971. Isle Royale National Park, Michigan. Tuff-breccia overlying the Greenstone Flow. Fragmental character is clearly evident in this outcrop, which is close to the base of the pyroclastic unit on the north shore of Tobin Harbor near Newman Island . Circa 1971. Isle Royale National Park, Michigan. Amygdaloid with calcite amygdules and calcite vein at top. Circa 1971. Yosemite National Park, California. Road cut at Big Meadow Overlook on Big Oak Flat Road. Isle Royale National Park, Michigan. Copper Harbor Conglomerate sloping gently southeast into Lake Superior near Attwood Beach. Circa 1971. Yosemite National Park, California. Weather pans (or pits) formed on the summit of North Dome, high above Yosemite Valley. Isle Royale National Park, Michigan. Slabby sandstone outcrop on Stone House Island. 1971. Isle Royale National Park, Michigan. Chlorastrolite amygdules showing characteristic segmented pattern.  Circa 1971. Yosemite National Park, California. Glacial till, an unsorted mixture of boulders, sand, and clay exposed along the Tioga Road at Siesta Lake. Yosemite National Park, California. Tahoe moraine in the Harden Lake area, showing its subdued crest and only scattered boulders exposed on the surface. Yosemite National Park, California. Pothole Dome, a large roche moutonne on the west side of Tuolumne Meadows, was shaped by glacial smoothing and plucking. Yosemite National Park, California. West shoulder of Mount Hoffmann. Smooth, unglaciated south-facing slope (on the left) is abruptly truncated by a north- facing glacial cirque - a striking contrast in erosional processes. Isle Royale National Park, Michigan. Specimen from the Washington Island Flow. Ophitic texture is obscure, but characteristic dark chlorite splotches are visible. Circa 1971. Isle Royale National Park, Michigan. Tuff-breccia overlying the Greenstone Flow. Fragmental character is clearly evident in this outcrop, which is close to the base of the pyroclastic unit on the north shore of Tobin Harbor near Newman Island . Circa 1971. Isle Royale National Park, Michigan. Amygdaloid with calcite amygdules and calcite vein at top. Circa 1971. Isle Royale National Park, Michigan. Copper Harbor Conglomerate sloping gently southeast into Lake Superior near Attwood Beach. Circa 1971. Isle Royale National Park, Michigan. Slabby sandstone outcrop on Stone House Island. 1971. Isle Royale National Park, Michigan. Chlorastrolite amygdules showing characteristic segmented pattern.  Circa 1971. Yosemite National Park, California. Half Dome Granodiorite contains large, well-formed hornblende crystals. Yosemite National Park, California. Road cut at Big Meadow Overlook on Big Oak Flat Road. Yosemite National Park, California. Weather pans (or pits) formed on the summit of North Dome, high above Yosemite Valley. Yosemite National Park, California. Glacial till, an unsorted mixture of boulders, sand, and clay exposed along the Tioga Road at Siesta Lake. Yosemite National Park, California. Tahoe moraine in the Harden Lake area, showing its subdued crest and only scattered boulders exposed on the surface. Yosemite National Park, California. Pothole Dome, a large roche moutonne on the west side of Tuolumne Meadows, was shaped by glacial smoothing and plucking. Yosemite National Park, California. West shoulder of Mount Hoffmann. Smooth, unglaciated south-facing slope (on the left) is abruptly truncated by a north- facing glacial cirque - a striking contrast in erosional processes.