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Yosemite National Park, California. Silhouette view of the gorge that separates Liberty Cap from the Nevada Fall platform. This gorge was, at one time, the channel of the Merced River and still carries off some of the flood waters in spring. The trail to the top of the Nevada Fall is laid through it. Circa 1913.
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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.
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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.
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Yosemite National Park, California. Cascade Cliffs and Little Yosemite Valley. In few other places in the Yosemite region is the granite more continuously massive than in the Cascade Cliffs. Only one horizontal master joint divides the rock (in the lower left.) The scales on the cliffs are merely surficial features due to exfoliation. The dark streaks indicate the paths followed by the ribbon cascades which descend from the upland in the spring, when the snow is melting, and from which the cliffs take their name. In the background is Sugar Loaf (Bunnell Point). Circa 1914. Plate 45-A, U.S. Geological Survey Professional paper 160. Note: The Francois E. Matthes' papers and field notebooks are housed in the Brancroft...
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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.
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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.
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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.
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Yosemite National Park, California. Glaciated rocks between Mono Pass and Parker Pass in the Sierra Nevada. The direction of ice motion was from right to left. A joint face on the lee side, exposed by the plucking away of a block, remains unscored. 1903.
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Yosemite National Park, California. Lower Jack Main Canyon. Recent fissure traversing rocks in the foreground and the mountain in the background. 1936.
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Yosemite National Park, California. Kolana Rock and Hetch Hetchy Lake. September 14, 1936.
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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.
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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.
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Comma-separated values (.csv) file containing data related to mercury concentrations in dragonfly samples from U.S. National Parks collected as part of the Dragonfly Mercury Project (DMP). This data release supersedes Eagles-Smith, C.A., Nelson, S.J., Flanagan-Pritz, C.M., Willacker Jr., J.J., and Klemmer, A.J., 2018, Total mercury concentrations in dragonfly larvae from U.S. national parks (ver. 8.0, December 2022): U.S. Geological Survey data release, https://doi.org/10.5066/P9TK6NPT. Please contact fresc_outreach@usgs.gov for access.
Categories: Data, Data Release - Revised; Tags: Acadia National Park, Allegheny Portage Railroad National Historic Site, Amistad National Recreation Area, Apostle Islands National Lakeshore, Appomattox Court House National Historical Park, All tags...
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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.
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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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Yosemite National Park, California. Cliff and plain east of Unicorn Pass. The granite is traversed by nearly vertical zones of incipient schistosity which influence sculpture. The pass seen on the right is determined by a broader zone. On the plain are trunks of pine trees which have been brought by avalanches from a cirque on the right. 1903.
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Yosemite National Park, California. One of the best preserved moraines of the older series. Most of the older moraines have long since lost their ridge forms and can be identified with certainty only by the character of their constituent rock materials. This moraine is situated below the Wawona Road south of Turtleback Dome. Circa 1914. Plate 34-A, U.S. Geological Survey Professional paper 160.
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Yosemite National Park, California. Effect of fire on the base of large pine trees near Tioga Road. Capt. Alex Rogers, Park Superintendent, stands beside a burned tree. September 1897.
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Yosemite National Park, California. Northeast on the floor of the Hetch Hetchy Valley, showing Kolana Rock. 1906.
map background search result map search result map Total mercury concentrations in dragonfly larvae from U.S. national parks (ver. 9.0, November 2023) Total mercury concentrations in dragonfly larvae from U.S. national parks (ver. 9.0, November 2023)