Following is one of the most descriptive and eloquent tributes ever paid to this unrivaled array of stupendous nature statuary:—
Every rock in its walls seems to glow with life. Some lean back in majestic repose; others, absolutely sheer or nearly so for thousands of feet, advance beyond their companions in thoughtful attitudes, giving welcome to storms and calms alike, seemingly aware, yet heedless, of everything going on about them. Awful in stern, immovable majesty, how softly these rocks are adorned, and how fine and reassuring the company they keep: their feet among beautiful groves and meadows, their brows in the sky, a thousand flowers leaning confidingly against their feet, bathed in floods of water, floods of light, while the snow and waterfalls, the winds and avalanches and clouds shine and sing and wreathe about them as the years go by, and myriads of small winged creatures—birds, bees, butterflies—give glad animation and help to make all the air into music. Down through the middle of the valley flows the crystal Merced, River of Mercy, peacefully quiet, reflecting lilies and trees and the onlooking rocks; things frail and fleeting and types of endurance meeting here and blending in countless forms, as if into this one mountain mansion Nature had gathered her choicest treasures, to draw her lovers into close and confiding communion with her. (John Muir, in "The Yosemite.")
HALF DOME, YOSEMITE
1. ICE-KING TOPOGRAPHY
The splendid scenic endowment of the Yosemite Valley, its stupendous architecture and vast sculpturing, its natural landscape engineering, are largely triumphs of the ice age. Many theories have been advanced to account for the origin and the extraordinary features of this valley, especial prominence being given to subsidence, uplift, explosion, with earthquake modifications and influences of violent cataclysmic nature. Stream erosion has been strongly urged. All these theories attribute minor influences to one or more other factors.
The theory now generally accepted gives ice the leading part in the scooping of the valley and the creation of its wondrous forms. There is much evidence to support this conclusion. The ice theory is championed by John Muir, by Clarence King, and by F. E. Matthes. Matthes and Muir probably have made the most careful and exhaustive studies of the geological history of the valley.
This famous depression is of varying width. Examination of its walls shows that in the wider places it is composed of fissured rock that was more readily carried away by the ice than the adjoining unfissured rock-sections. These resisting unfissured places jut into the valley.
Erosion by ice probably was preceded and somewhat guided by stream erosion. But this ice sculpture, the rock-forms and features wrought, must have been determined in a marked measure by the rock-structure. That is to say, the dense quality of the rock, the number and the position of the cleavage joints, or their absence in the rock, were factors that helped determine the rock-forms of Yosemite. Other factors since the ice age have altered or modified this glacial topography.
It is certain that a vast ice-stream poured over the walls and forced through this valley. This is shown in the rock-groovings and perched boulders high on the walls, and also by the massive moraine which dams the outlet of the valley. It appears certain that this must have been left when the ice vanished; and apparently it formed a lake that filled the entire valley nearly to the height of the dam. The lake finally filled with sediment and sand, its surface corresponding approximately with the present surface of the valley. The valley floor is noticeably smooth, and its margins along the bottoms of the walls are comparatively free from rock-débris.