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6,750 foot contour accordant junctions amount of over-deepening average gradient blocks Branner cross-profile deepening depth of alluvium discordance in junction due to weathering entrench evidence extensive glacial Falls Fig farther favor feet flowing former elevation glacial basin glacial erosion glacial over-deepening glacial trough granite hanging valleys headwater areas Hetch Hetchy Hetch Hetchy Valley ice streams Illilouette Creek Illilouette Falls Illilouette Glacier Illilouette Valley joint planes jointed rocks lateral cutting Little Yosemite Valley longitudinal profile Lower Yosemite Falls main river main stream Merced River miles Nevada Falls North Fork notch due notches beside occupied open valley over-steepened lower course Portal portion present river erosion shown Sierra Nevada slope stream erosion stream level Tehipite Valley Tenaya Canyon Tenaya Creek Tenaya Glacier tilting tion topographic tributary streams Turner unstable position uplift Valley Map valley widening Vernal Falls vertical faces weathering along joint widening in jointed width Yosemite Creek Yosemite Quadrangle young stream
Page 13 - Bulletin, 1911. are in no sense comparable with the hanging valleys tributary to wide open valleys, such as the Yosemite, which appear to afford strong evidence in favor of glacial erosion. Instead of disproving the glacial origin of the Yosemite, the comparison of valleys suggested by Turner really affords strong evidence in favor of the theory of glacial erosion. It is no mere coincidence that of the six valleys named by that writer the two most unlike the Yosemite have presumably suffered little...