The Yosemite guide-book : a description of the Yosemite Valley and the adjacent region of the Sierra Nevada, and of the big trees of California . its courseis here about the same that it was below, or nearly west; it holds thisdirection nearly up to the base of the Mount Lyell Group, where it heads,between the main crest of the Sierra and the parallel subordinate or siderange called by us the Merced or Obelisk Group. In the left hand, ornorthwesterly canon, the Tenaya Fork of the Merced comes down, and in theright hand, or southwesterly one, the South Fork,* or the Illilouette. * This is the S
The Yosemite guide-book : a description of the Yosemite Valley and the adjacent region of the Sierra Nevada, and of the big trees of California . its courseis here about the same that it was below, or nearly west; it holds thisdirection nearly up to the base of the Mount Lyell Group, where it heads,between the main crest of the Sierra and the parallel subordinate or siderange called by us the Merced or Obelisk Group. In the left hand, ornorthwesterly canon, the Tenaya Fork of the Merced comes down, and in theright hand, or southwesterly one, the South Fork,* or the Illilouette. * This is the South Fork of the Middle Fork, and not the main South Fork, which flows by-Clarks Eanch. To avoid confusion, it will be well to call it by the Indian name, Illilouette, one notyet much in use in the 66 THE YdSKMlTE (iUIDE-BOOK. At the angle where the Yoseiuite brandies we have, on the north side, theroxuidcd cohimnar mass of rock called the Washington Column, and imrae-diateh to the left of it the immense arched cavity called the RoyalArches, and over these is seen the dome-shaped mass called the NorthDome, shown in Fig. 4. Fig. THE NORTH DOME. The North Dome, rising to 3,568 feet above the Valle}^, is one of thoserounded masses of granite which are not uncommon in the Sierra dome-shaped masses are somew^hat characteristic of all granitic regions,but are nowhere developed on so giand a scale as in the Sierra. Anexamination of the figure wull show that the North Dome is made up ofhuge concentric plates of rock, overlapping each other, in such a way as toabsolutely prevent an ascent on the side presented to the Valley; to thenorth, however, the Dome runs out in a long ridge, as represented on *«^-l
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