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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. 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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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. 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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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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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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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. 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. 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. 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. Bridalveil Fall, an outstanding example of a waterfall issuing from a hanging valley far above the Yosemite Valley floor. Photo by J.A. Thomas. 1987. Figure 59, U.S. Geological Survey Bulletin 1595.
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Album caption and index card: Exfoliation in granite near Shuteye Peak in the Sierra Nevada Mountains. Man for scale. Shuteye Peak quadrangle. Madera County, California. n.d. (Same as U.S.G.S. photo no. 73). Published on page 38 in U.S. Geological Survey. Annual report. 1978.
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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.
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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.


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. Exfoliation in granite near Shuteye Peak in the Sierra Nevada Mountains. Shuteye Peak quadrangle, Madera County, California. No date. 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. Exfoliation in granite near Shuteye Peak in the Sierra Nevada Mountains. Shuteye Peak quadrangle, Madera County, California. No date.