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Pywiack Domes
Pywiack Dome is a prominent 600 foot granite dome in Yosemite National Park, located north-east of Tenaya Lake, west of Tuolumne Meadows and from the Tioga Road. It is quite near Harlequin Dome, and North and South Whizz Domes are north. Josiah Whitney the head of California Geological Survey wrote in 1863 about Pywiack Dome in ''Geology'': Climbing The west face of the formation is popular with rock climbers and has several multi-pitch slab climbs easily visible from the Tioga Road. Earliest was ''Dike Route'' a 6 pitch YDS 5.9R first climbed in August 1966 by Tom Gerughty, Roger Evje and Dave Meeks. Other popular climbs include Zee Tree (a 5 pitch YDS 5.7) and Aqua Knobby (a 4 pitch YDS 5.9) Etymology "Py-we-ack" in the native language means "glistening rocks", and the native people applied it to both the Tenaya Creek and Tenaya Lake, due to the abundance of glacial polish in the upper Tenaya basin. In 1932 the name "Pywiack" has applied to Pywiack Cascade. Pywi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
California
California is a U.S. state, state in the Western United States, located along the West Coast of the United States, Pacific Coast. With nearly 39.2million residents across a total area of approximately , it is the List of states and territories of the United States by population, most populous U.S. state and the List of U.S. states and territories by area, 3rd largest by area. It is also the most populated Administrative division, subnational entity in North America and the 34th most populous in the world. The Greater Los Angeles area and the San Francisco Bay Area are the nation's second and fifth most populous Statistical area (United States), urban regions respectively, with the former having more than 18.7million residents and the latter having over 9.6million. Sacramento, California, Sacramento is the state's capital, while Los Angeles is the List of largest California cities by population, most populous city in the state and the List of United States cities by population, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
California Geological Survey
The California Geological Survey, previously known as the California Division of Mines and Geology, is the California state geology, geologic agency. History Although it was not until 1880 that the California State Mining Bureau, predecessor to the California Geological Survey, was established, the "roots" of California's state geological survey date to an earlier time. As might be expected for a state that owed its existence to the California Gold Rush, gold rush of 1849, the California State Legislature recognized that geologists could provide valuable information. In 1851, one year after California was admitted to the United States, the Legislature named John B. Trask, a medical practitioner and active member of the California Academy of Sciences, as Honorary State Geologist. In 1853 the Legislature passed a joint resolution asking him for geological information about the state. He submitted a report ''On the Geology of the Sierra Nevada (U.S.), Sierra Nevada, or California Ran ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Granite Domes Of Yosemite National Park
Granite () is a coarse-grained (phaneritic) intrusive igneous rock composed mostly of quartz, alkali feldspar, and plagioclase. It forms from magma with a high content of silica and alkali metal oxides that slowly cools and solidifies underground. It is common in the continental crust of Earth, where it is found in igneous intrusions. These range in size from dike (geology), dikes only a few centimeters across to batholiths exposed over hundreds of square kilometers. Granite is typical of a larger family of ''granitic rocks'', or ''granitoids'', that are composed mostly of coarse-grained quartz and feldspars in varying proportions. These rocks are classified by the relative percentages of quartz, alkali feldspar, and plagioclase (the QAPF diagram, QAPF classification), with true granite representing granitic rocks rich in quartz and alkali feldspar. Most granitic rocks also contain mica or amphibole minerals, though a few (known as leucogranites) contain almost no dark minerals. ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Quadrangle (geography)
A "quadrangle" is a topographic map produced by the United States Geological Survey (USGS) covering the United States. The maps are usually named after local physiographic features. The shorthand "quad" is also used, especially with the name of the map; for example, "the Ranger Creek, Texas quad". From approximately 1947-1992, the USGS produced the 7.5 minute series, with each map covering an area one-quarter of the older 15-minute quad series, which it replaced. A 7.5 minute quadrangle map covers an area of . Both map series were produced via photogrammetric analysis of aerial photography using stereoplotters supplemented by field surveys. These maps employ the 1927 North American Datum (NAD27); conversion or a change in settings is necessary when using a GPS which by default employ the WGS84 geodetic datum. Beginning in 2009, the USGS made available digital versions of 7.5 minute quadrangle maps based on GIS data that use the NAD83 datum, which is typically within one meter of ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
David Brower
David Ross Brower (; July 1, 1912 – November 5, 2000) was a prominent environmentalist and the founder of many environmental organizations, including the John Muir Institute for Environmental Studies (1997), Friends of the Earth (1969), Earth Island Institute (1982), North Cascades Conservation Council, and Fate of the Earth Conferences. From 1952 to 1969, he served as the first Executive Director of the Sierra Club, and served on its board three times: from 1941–1953; 1983–1988; and 1995–2000 as a petition candidate enlisted by reform-activists known as the John Muir Sierrans. As a younger man, he was a prominent mountaineer. Early life Brower was born in Berkeley, California. He was married to Anne Hus Brower (1913–2001) whom he met when they were both editors at the University of California Press in Berkeley. Anne was the daughter of Francis L M. Hus and Frances Hus (1876–1952), while Frances was the daughter of John P. Irish. Kenneth Brower, David Brower's s ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pywiack Cascade
The Pywiack Cascade is a waterfall in Yosemite National Park within the U.S. state of California. It is located a few miles downstream from the outlet of Tenaya Lake on Tenaya Creek at the head of the steep and rugged granite gorge, Tenaya Canyon. The waterfall can be viewed from Glacier Point, or by a hike from Olmsted Point, but the canyon is dangerous and the waterfall is unsafe to be reached on foot. The waterfall is highly seasonal. It typically rages in the spring and early summer while shrinking to a trickle by late summer to mid-autumn. The water of the Pywiack Cascade slides down a steep angle of solid granite, for a total of about . A small waterfall lies directly below the main drop. Below that, the creek continues over jumbled talus for less than a quarter of a mile (0.4 km) before it plunges over another large waterfall. Not much farther downstream is Three Chute Falls whose waters continue on into Mirror Lake and then finally empty into the Merced River, w ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tenaya Creek
Tenaya (died 1853) was a leader of the Ahwahnechee people in Yosemite Valley, California. Background Tenaya's father was a leader of the Ahwahnechee people (or Awahnichi). The Ahwahneechee had become a tribe distinct from the other tribes in the area. Lafayette Bunnell, the doctor of the Mariposa Battalion, wrote that "Ten-ie-ya was recognized, by the Mono tribe, as one of their number, as he was born and lived among them until his ambition made him a leader and founder of the Paiute colony in Ah-wah-ne." The Ahwahneechee occupied Yosemite Valley until a sickness destroyed most of them. The few Ahwahneechee left Yosemite Valley and joined the Mono Lake Paiutes in the eastern Sierra Nevada. Tenaya's father married a Mono Paiute woman and Tenaya was born from that union. Tenaya grew up amongst his mother's people. Leadership An Ahwahneechee medicine man and friend of his Father persuaded a young Tenaya to return. Tenaya took the few remnants of the Ah-wah-nee-chees that had been l ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Yosemite Decimal System
The Yosemite Decimal System (YDS) is a three-part system used for rating the difficulty of walks, hikes, and climbs, primarily used by mountaineers in the United States and Canada. It was first devised by members of the Sierra Club in Southern California in the 1950s as a refinement of earlier systems, particularly those developed in Yosemite Valley, and quickly spread throughout North America. Description The class 5 portion of the class scale is primarily a rock climbing classification system, while classes 1–2 are used mainly in hiking and trail running. Class 3 describes easy and moderate climbing (i.e. scrambling), with varying amounts of exposure (length of a possible fall). Class 4 is an "in-between" rating that describes a very exposed scramble, corresponding roughly to the IFAS classification of PD+. Climbers, specifically those involved with technical class 5 climbing, often abbreviate "class 3" and "class 4" to "3rd" and "4th" respectively. Originally the system was ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pitch (ascent/descent)
In rock climbing and ice climbing, a pitch is a steep section of a route that requires a rope between two belays, as part of a climbing system. Standard climbing ropes are between 50 and 80 metres long, so a pitch is always shorter, between two convenient ledges if possible; longer routes are multi-pitch, requiring the re-use of the rope each time. In free climbing, pitch refers to classification by climbers of the difficulty of ascent on certain climbing routes. illustrated superimposed on the successful ascent of the Dawn Wall, as photographed on El Capitan in Yosemite. In climbing In advanced climbing or mountaineering, another definition of ''pitch'' is not restricted by the length of the rope. On easier terrain or when moving quickly, ...[...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Slab Climbing
Slab climbing is a type of rock climbing where the rock face is at an angle less steep than vertical. It is characterized by balance- and friction-dependent moves on very small holds. It is often not leadable, or climbable from the ground up, unless it has pre-drilled bolts to protect the climb, making most slab climbs either top rope climbing or sport climbing. Special techniques such as smearing are necessary to climb slab. It is a type of face climbing and is distinctly different from crack climbing. Slab climbing is a relatively new area of climbing, having become more popular in the last 30 years, and some of the highest graded routes are currently being realized. History The first routes put up on new cliffs almost always follow cracks, due to the ease of placing protection, or pieces of equipment which arrest a fall, while on lead. Slab climbs rarely have cracks or other features that can be protected. Therefore, slab climbs are usually discovered well after the cr ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Multi-pitch Climbing
Multi-pitch climbing is the ascent of climbing routes with one or more stops at a belay station. Each section of a climb between stops at belay stations is called a pitch. The leader ascends the pitch, placing gear and stopping to anchor themselves to the belay station. The general purpose of these stops is to allow the second climber to ascend to the point of the lead climber while collecting the protective gear from the route in the course of the lead climber's ascent. At the belay station, the protective gear is collected, possibly exchanged to a new leader, and the leader of the next pitch ascends the route. Reasons for invoking stops Climbers invoke stops either by choice, convention or necessity. Examples include: *The rope is too short to do the entire route in one pitch. *The leader has run out of protective gear. *There is a convenient protectable ledge, or fixed bolts placed by previous climbers, at the location for a belay station. *The leader chooses to rest or excha ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
