An Engineer's Holiday Or Notes of a Round Trip from Long. 00 to 00

Portada
Kegan Paul, Trench & Company, 1882
 

Páginas seleccionadas

Otras ediciones - Ver todas

Términos y frases comunes

Pasajes populares

Página 336 - We conceive that, during the process of upheaval of the Sierra, or, possibly, at some time after that had taken place, there was at the Yosemite a subsidence of a limited area, marked by lines of " fault " or fissures crossing each other somewhat nearly at right angles. In other and more simple language, the bottom of the Valley sank down to an unknown depth, owing to its support being withdrawn from underneath, during some of those convulsive movements which must have attended the upheaval of so...
Página 37 - We must be unanimous ; there must be no pulling different ways; we must all hang together.
Página 331 - ... almost, and soon divides into three branches, through either of which we may, going up a series of gigantic steps, as it were, ascend to the general level of the Sierra. Down each of these branches, or canons, descend streams, forks of the Merced, coming down the steps in a series of stupendous waterfalls. At its lower end, the valley contracts into a narrow gorge, or canon, with steeply inclined walls, and not having the U shape of the Yosemite, but the usual V form of California valleys.
Página 337 - Valley no remains of the moraines which such an operation could not fail to have formed. It appears to us that there is no way of disposing of the vast mass of detritus, which must have fallen from the walls of the Yosemite since the formation of the Valley, except by assuming that it has gone down to fill the abyss, which was opened by the subsidence which our theory supposes to have taken place. What the depth of the...
Página 336 - Yosemite in a way which has hardly yet been recognised as one of those in which valleys may be formed, probably for the reason that there are so few cases in which such an event can be absolutely proved to have occurred. We conceive that during the process of upheaval of the Sierra, or possibly at...
Página 337 - ... have been we have no data for computing; but that it must have been very great is proved by the fact that it has been able to receive the accumulations of so long a period of time. The cavity was, undoubtedly, occupied by water, forming a lake of unsurpassed beauty and grandeur, until quite a recent epoch. The gradual desiccation of the whole country, the disappearance of the glaciers and the filling up of the abyss to nearly a level with the present outlet, where the Valley passes into a canon...
Página 337 - ... such an exceptional result should not be brought about, amid the complicated play of forces which the elevation of a great mountain chain must set in motion. By the adoption of the subsidence theory for the formation of the Yosemite, we are able to get over one difficulty which appears insurmountable with any other. This is, the very small amount of debris at the base of the cliffs, and even, at a few points, its entire absence, as previously noticed in our description of the Valley.
Página 331 - The Valley is a nearly level area, about six miles in length and from half a mile to a mile in width, sunk almost a mile in perpendicular depth below the general level of the adjacent region. It may be...
Página 278 - Above this zone of red earth, softly modelled undulations, and dull, grayish groves, with a chain of mining towns, dotted ranches and vineyards, rise the swelling middle heights of the Sierras, a broad billowy plateau cut by sharp sudden canons, and sweeping up, with its dark, superb growth of coniferous forest to the feet of the summit peaks. For a breadth of forty miles, all along the chain, is spread this continuous belt of pines. From Walker's Pass to Sitka one may ride through an unbroken forest,...
Página 276 - By far the grandest of all these ranges is the Sierra Nevada, a long and massive uplift lying between the arid deserts of the Great Basin and the Californian exuberance of grain-field and orchard ; its eastern slope, a defiant wall of rock plunging abruptly down to the plain ; the western, a long, grand sweep, well watered and overgrown with cool, stately forests ; its crest a line of sharp, snowy peaks springing into the sky and catching the alpenglow long after the sun has set for all the rest...

Información bibliográfica