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Isle Royale National Park, Michigan. Ancient lava flow with ropy surface. Circa 1971. Figure 16 (upper photo), U.S. Geological Survey Bulletin 1309.
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Isle Royale National Park, Michigan. Bull moose feeding in a beaver pond. Circa 1971. Figure 6, U.S. Geological Survey Bulletin 1309.
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Yosemite National Park, California. North from Mount Hoffman, including snow- patched Sawtooth Ridge and Matterhorn Peak on the skyline at the north edge of the park. Photo by T.R. Alpha. Figure 4-B, U.S. Geological Survey Bulletin 1595.
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Isle Royale National Park, Michigan. Characteristic textures of volcanic rocks on Isle Royale: typical ophite, beach pebble from Mott Island. Circa 1971. Figure 4-A, U.S. Geological Survey Professional paper 754-C; Figure 12-A, U.S. Geological Survey Bulletin 1309.
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Yosemite National Park, California. Columnar joints in a basalt plug, a remnant of a volcanic conduit at "Little Devils Postpile" adjacent to the Tuolumne River west of Tuolumne Meadows. Figure 32, U.S. Geological Survey Bulletin 1595.
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Isle Royale National Park, Michigan. Ripple markings on sandstone, west of Attwood Beach. Photo by R.G. Wolff, circa 1971. Figure 35, U.S. Geological Survey Bulletin 1309.
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Yosemite National Park, California. Inclined joints determine the westward slope of the upper surface of the Three Brothers. Photo by U.S. National Park Service. Figure 34, U.S. Geological Survey Bulletin 1595.
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Yosemite National Park, California. Glacial polish high on the east shoulder of Fairview Dome. It and similar polish and erratics on the summit indicate that the dome was once overtopped by ice. Figure 66, U.S. Geological Survey Bulletin 1595.
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Isle Royale National Park, Michigan. Water-current feature formed by flow deflected around shale fragments. Direction of the current flow is toward the right. Circa 1971. Figure 31, U.S. Geological Survey Bulletin 1309.
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Yosemite National Park, California. Dike of light-colored, fine-grained aplite crosscutting granodiorite. Aplite is a silica-rich rock composed chiefly of quartz and potassium feldspar. Figure 13, U.S. Geological Survey Bulletin 1595.
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Yosemite National Park, California. Resistant potassium feldspar phenocrysts protrude from the weathered surface of Cathedral Peak Granodiorite. Matrix minerals formerly enclosing the phenocrysts have been weathered to grus (granite sand) and washed away. Figure 46, U.S. Geological Survey Bulletin 1595.
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Yosemite National Park, California. Rectangular blocks formed in El Capitan Granite by intersecting joints. Figure 36, U.S. Geological Survey Bulletin 1595.
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Yosemite National Park, California. El Capitan Granite. Rock surface chemically etched and stained to differentiate potassium feldspar (orange- yellow), plagioclase (red), and quartz (uncolored). Figure 10-B, U.S. Geological Survey Bulletin 1595.
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Porphyritic texture in Cathedral Peak Granodiorite, with potassium feldspar phenocrysts much larger than the other minerals in the rock matrix. Yosemite National Park. California. n.d. Published as figure 14 in U.S. Geological Survey. Bulletin 1595. 1987.
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Isle Royale National Park, Michigan. Native copper mass from the Minong mine. This is perhaps typical of specimens from the fissure deposits on Isle Royale, but larger than average. Circa 1971. Figure 70, U.S. Geological Survey Bulletin 1309.
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Yosemite National Park, California. South from Mount Hoffman, toward Clouds Rest, in the late spring, with Mount Clark on the left skyline. Half Dome, at the far right center, displays its northeast shoulder, in contrast to its often pictured profile from Yosemite Valley's floor. Photo by U.S. National Park Service. Figure 4-D, U.S. Geological Survey Bulletin 1595.
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Yosemite National Park, California. Sheet joints follow topographic surfaces. Concave sheeting on a valley floor. Figure 40C, U.S. Geological Survey Bulletin 1595.
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Yosemite National Park, California. Sheet joints follow topographic surfaces. Near vertical sheeting on Matthes Crest. Figure 40-D, U.S. Geological Survey Bulletin 1595.
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Isle Royale National Park, Michigan. Wave-cut arch on Amygdaloid Island. A short distance west is a collapsed arch. Circa 1971. Figure 18, U.S. Geological Survey Professional paper 754-A; Figure 68, U.S. Geological Survey Bulletin 1309.
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Yosemite National Park, California. Glacial moraines in Yosemite Valley. Tioga-age recessional moraine exposed in a road cut below Cathedral Rock. Large boulder in the center is Cathedral Peak Granodiorite. Figure 74-B, U.S. Geological Survey Bulletin 1595.


map background search result map search result map Yosemite National Park, California. North from Mount Hoffman, including snow- patched Sawtooth Ridge and Matterhorn Peak on the skyline at the north edge of the park. Yosemite National Park, California. South from Mount Hoffman, toward Clouds Rest, in the late spring, with Mount Clark on the left skyline. Isle Royale National Park, Michigan. Wave-cut arch on Amygdaloid Island. A short distance west is a collapsed arch.  Circa 1971. Characteristic textures of volcanic rocks on Isle Royale: typical ophite, beach pebble from Mott Island. Isle Royale National Park, Keweenaw County, Michigan. 1971. Yosemite National Park, California. Columnar joints in a basalt plug, a remnant of a volcanic conduit at "Little Devils Postpile" adjacent to the Tuolumne River west of Tuolumne Meadows. Yosemite National Park, California. Inclined joints determine the westward slope of the upper surface of the Three Brothers. Isle Royale National Park, Michigan. Bull moose feeding in a beaver pond. Circa 1971. Yosemite National Park, California. Sheet joints follow topographic surfaces. Concave sheeting on a valley floor. Yosemite National Park, California. Sheet joints follow topographic surfaces. Near vertical sheeting on Matthes Crest. Isle Royale National Park, Michigan. Ancient lava flow with ropy surface. Circa 1971. Isle Royale National Park, Michigan. Water-current feature formed by flow deflected around shale fragments. Circa 1971. Isle Royale National Park, Michigan. Ripple markings on sandstone, west of Attwood Beach. Native copper mass from the Minong mine. Isle Royale National Park, Michigan. 1971. Yosemite National Park, California. Glacial polish high on the east shoulder of Fairview Dome. Isle Royale National Park, Michigan. Wave-cut arch on Amygdaloid Island. A short distance west is a collapsed arch.  Circa 1971. Characteristic textures of volcanic rocks on Isle Royale: typical ophite, beach pebble from Mott Island. Isle Royale National Park, Keweenaw County, Michigan. 1971. Isle Royale National Park, Michigan. Bull moose feeding in a beaver pond. Circa 1971. Isle Royale National Park, Michigan. Ancient lava flow with ropy surface. Circa 1971. Isle Royale National Park, Michigan. Water-current feature formed by flow deflected around shale fragments. Circa 1971. Isle Royale National Park, Michigan. Ripple markings on sandstone, west of Attwood Beach. Native copper mass from the Minong mine. Isle Royale National Park, Michigan. 1971. Yosemite National Park, California. North from Mount Hoffman, including snow- patched Sawtooth Ridge and Matterhorn Peak on the skyline at the north edge of the park. Yosemite National Park, California. South from Mount Hoffman, toward Clouds Rest, in the late spring, with Mount Clark on the left skyline. Yosemite National Park, California. Columnar joints in a basalt plug, a remnant of a volcanic conduit at "Little Devils Postpile" adjacent to the Tuolumne River west of Tuolumne Meadows. Yosemite National Park, California. Inclined joints determine the westward slope of the upper surface of the Three Brothers. Yosemite National Park, California. Sheet joints follow topographic surfaces. Concave sheeting on a valley floor. Yosemite National Park, California. Sheet joints follow topographic surfaces. Near vertical sheeting on Matthes Crest. Yosemite National Park, California. Glacial polish high on the east shoulder of Fairview Dome.