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| | The Geologic Story of Yosemite Valley |
 | | Admiring Yosemite Valleys intricately sculptured walls as they appear today and knowing something about the granitic rock from which they were carved, we can look back in time to speculate on the evolution of the valleys formationits geologic history. |
 | | But the walls of Yosemite Valley are extremely ragged, with many pinnacles and spires projecting upward from themLeaning Tower, Cathedral Spires, Sentinel Rock, and Lost Arrow stand out strikingly. |
 | | Matthes, F. E., 1930, Geologic history of the Yosemite Valley: U.S. Geological Survey Professional Paper 160, 137 p., with an appendix on The granitic rocks of the Yosemite region, by F. Calkins. |
| www2.nature.nps.gov /geology/usgsnps/yos/topobk.html (4528 words) |
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