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Classic Nature Writing 19th Century
Industry Reviews "Not only is [Muir] the author to whom all men turn when they think of the Sierras and Northern glaciers. The Rescue Dog. Frequently Asked Questions. Multimedia Gallery. Park Passes. Technical Announcements. Employees in the News.
Emergency Management. Geological Survey looks back on the integral role its science has played in the long-term health, management, and understanding of the park and its natural resources. Johnson were formally mapping the glaciers on the highest peaks in Yosemite National Park.
Compare that early map to the most recent topo map of El Capitan in Yosemite. The first written geologic observations of Yosemite came from the William Henry Brewer party of Henry W. One of the significant findings to come out of the Matthes volume was the confirmation of the role glaciers played in the shaping of Yosemite Valley. Although proposed much earlier by others, including John Muir, Matthes finally settled the debate of whether glaciers carved the Yosemite Valley we see today. USGS geologist N.
Cooling and crystallization of this deep-seated magma required millions of years. The resulting rock, composed of interlocking crystals of several kinds of minerals, is called a plutonic rock, named for Pluto, the Roman god of the underworld. Formation of the plutonic rocks of the Sierra occurred over a long timespan, as magma episodically rose from the Earth's interior, intruding older host rocks, and eventually crystallizing to create one of many individual bodies of rock called plutons. Many of these plutons are today exposed at the Earth's surface due to erosion of the once overlying older rocks.
Rockfalls and landslides are natural part of the processes that shape the steep valley walls and rock domes of Yosemite. Most go unnoticed by visitors, but when rockfalls happen in places popular with visitors, the results can be catastrophic. In past years, there have been instances of deaths and injuries in the Park when visitors were hit by rocks falling from the Yosemite Valley walls.
Rockfalls were noticed and written about by visitors and geologists in the late 19 th century, but only when a number of significant rockfalls affected lives and Park infrastructure in the s and s, did USGS become involved in formal Yosemite rockfall studies. To understand the rockfall process, and to prevent additional deaths or injuries, USGS collaborated with NPS in a landmark study assessing the areas in the Park most at-risk for rockfalls. As a result of the rockfall hazard and risk study that outlined the most hazardous areas, the Park Service removed and repurposed infrastructure located throughout Yosemite Valley including some rental cabins from Curry Village in When a rock fell on February 11, and landed within the footprint of one of the cabins that was removed, it demonstrated the merit of the scientific hazard and risk assessment and the prudent removal of buildings by NPS from hazardous areas, and probably saved lives or at least prevented serious injury.
Current USGS research on rockfalls in Yosemite Valley continues, using state-of-the-art lidar and radar technology, as well as motion sensors to track rock movements, as precursors to rockfalls.
Mod Lib The Yosemite (Modern Library Classics)
The U. Geological Survey has worked with the National Park Service for three decades, performing timely, relevant rock fall research in and for Yosemite National Park. These efforts include rockfall hazard response and investigation, investigation of triggering mechanisms, compilation of rockfall inventories, and performing rock fall hazard and risk assessments.
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Taken as a whole, these efforts and body of research has dramatically reduced risks from rock fall in Yosemite. Pages can include considerable notes-in pen or highlighter-but the notes cannot obscure the text. Plus d'informations sur ce vendeur Contacter le vendeur.
Ajouter au panier. Description du livre Modern Library.
Light rubbing wear to cover, spine and page edges. Very minimal writing or notations in margins not affecting the text. Possible clean ex-library copy, with their stickers and or stamp s. Description du livre Modern Library, Etat : New. Never used!. Etat : Very Good. Ships from the UK.
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Former Library book. Great condition for a used book! Minimal wear. Description du livre Modern Library, NY, Soft cover. Muir, John and Gleason, Herbert photog illustrateur. Close to new, faint stray ink mark on front cover. Text clean. Vertical crease on covers near spine, spine itself uncreased. A 5th printing of a Modern Library facsimile reprint of the Houghton Miifflin edition.
Muir recounts his yiouthful experiences of exploring Yosemite area of California. Introduction by Mike Davis. A classic in environmental literature. Size: 8vo -- 8 in Tall. Description du livre Etat : good.
Best Yosemite Hikes Away from the Crowds
Used products do not contain supplements and some products may include highlighting and writing. Description du livre Modern Library, New York, Trade Paperback. Herbert W.
Gleason and John Muir illustrateur. Complete number line with the 1 present.