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