Post 24444
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Two of the most songful of the rivers, the Tuolumne and Merced, water nearly all the Park, spreading their branches far and wide, like broad-headed oaks; and the highest branches of each draw their sources from one and the same foundation on Mount Lyell, at an elevation of about thirteen thousand feet above the sea. The crest of the mountain, against which the head of the glacier rests, is worn to a thin blade full of joints, through which a part of the glacial water flows southward, giving rise to the highest trickling affluents of the Merced; while the main drainage, flowing northward, gives rise to those of the Tuolumne. After diverging for a distance of ten or twelve miles, these twin rivers flow in a general westerly direction, descending rapidly for the first thirty miles, and rushing in glorious apron cascades and falls from one Yosemite valley to another. Below the Yosemites they descend in gray rapids and swirling, swaying reaches, through the chaparral-clad cañons of the foothills and across the golden California plain, to their confluence with the San Joaquin, where, after all their long wanderings, they are only about ten miles apart.
The main cañons are from fifty to seventy miles long, and from two to four thousand feet deep, carved in the solid flank of the range. Though rough in some places and hard to travel, they are the most delightful of roads, leading through the grandest scenery, full of life and motion, and offering most telling lessons in earth sculpture. The walls, far from being unbroken, featureless cliffs, seem like ranges of separate mountains, so deep and varied is their sculpture; rising in lordly domes, towers, round-browed outstanding headlands, and clustering spires, with dark, shadowy side cañons between. But, however wonderful in height and mass and fineness of finish, no anomalous curiosities are presented, no “freaks of nature.” All stand related in delicate rhythm, a grand glacial rock song.
Among the interesting and influential of the secondary features of cañon scenery are the great avalanche taluses, that lean against the walls at intervals of a mile or two. In the middle Yosemite region they are usually from three to five hundred feet high, and are made up of huge, angular, well-preserved, unshifting boulders, overgrown with gray lichens, trees shrubs, and delicate flowering plants. Some of the largest of the boulders are forty or fifty feet cube, weighing from five to ten thousand tons; and where the cleavage joints of the granite are exceptionally wide apart a few blocks may be found nearly a hundred feet in diameter. These wonderful boulder piles are distributed throughout all the cañons of the range, completely choking them in some of the narrower portions, and no mountaineer will be likely to forget the savage roughness of the roads they make. Even the swift, overbearing rivers, accustomed to sweep everything out of their way, are in some places bridled and held in check by them. Foaming, roaring, in glorious majesty of flood, rushing off long rumbling trains of ponderous blocks without apparent effort, they are not able to move the largest, which, withstanding all assaults for centuries, are left at rest in the channels like islands, with gardens on their tops, fringed with foam below, with flowers above.