Geology Underfoot in Yosemite National Park Table of Contents
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Preface
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vii
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Introduction |
1
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Yosemite's Geologic Backdrop
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1
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How Glaciers Work and How They Shaped Yosemite
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10
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What Is a Glacier?
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11
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How Glaciers Erode
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16
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Glacial Modification of Landscapes
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18
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What Glaciers Leave Behind
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22
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History of Glaciers in Yosemite
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24
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Modern Glaciers
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29
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Rivers and Streams in Yosemite
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30
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Geologic Study of Yosemite
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36
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1. Bones of the Earth
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Granite, Granodiorite, and the Bedrock of Yosemite
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41
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2. Vertical Exposure
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The Geology of Yosemite Climbing
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57
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3. Pushed of a Cliff |
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The Origin of Yosemite Falls
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71
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4. Giant Steps
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Vernal and Nevada Falls
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77
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5. Free-Falling Granite
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The 1996 Happy Isles Rockfall and Its Unusual Air Blast
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85
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6. That's the Way the Cookie Crumbles
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The 1982 Cookie Cliff Rockslide
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95
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7. The Walls Came Tumbling Down |
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Earthquakes and Rock Avalanches in Yosemite Valley
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103
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8. How Water Sculpts Yosemite
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The Flood of 1997
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111
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9. A Natural Dam Across Yosemite Valley |
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The El Capitan Moraine
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121
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10. Cracks in the Earth
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The Fissures of Taft Point
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131
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11. Half a Dome Is Better Than None
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Sentinel Dome and Half Dome
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139
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12. The Earth as an Onion |
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Exfoliation Joints
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147
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13. The Ice Went Thataway!
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The Shaping of Pothole Dome
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155
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14. Exotic Erratics
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Glacially Transported Boulders at Olmsted Point |
165
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15. Why are There Trees Poking Out of Tenaya Lake? |
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The Great Medieval Megadrought
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171
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16. Soda Springs |
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That Fizzy Taste Carries a Geochemical Surprise
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181
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17. Runaway Rocks
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Metamorphic Rocks at May Lake
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187
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18. Root of an Ancient Volcano |
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Little Devils Postpile
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195
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19. Tombstone Rocks, Slate and Greenstone
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Rocks of the Western Approaches
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205
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20. Inverted Landscape |
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The Stanislaus Table Mountain Lava Flow
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217
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21. Eocene Erosion |
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Ancient, Weathered Landscapes of the Sierra Nevada
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225
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22. An Ancient, Ice-Bound Sea |
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Mono Lake and Ancestral Lake Russell
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235
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23. An Underwater Volcano |
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Mono Lake's Black Point
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247
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24. Evidence of the Ice Ages |
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Glacial Deposits In and Around Lee Vining Canyon
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255
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25. Dreams of Silver |
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The Mines of Bennettville and Dana Village
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267
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Glossary
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274
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Sources of More Information
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282
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Index
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289
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