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Page |
Frontispiece. Half Dome at sunset |
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Plate |
1. Geologic map of Yosemite National Park and vicinity | II |
| 2. Geologic map of the Yosemite Valley area | 66 |
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Figure |
1. Yosemite National Park area | 1 |
| 2. The Sierra Nevada, an asymmetric mountain range | 2 |
| 3. Summit of Mount Hoffmann, with Charles F. Hoffmann at the transit | 3 |
| 4. Views from Mount Hoffmann | 4 |
| 5. Panorama from Mount Hoffmann | 6 |
| 6. Physiographic diagram of Yosemite National Park | 7 |
| 7. Geologic time scale | 9 |
| 8. Hornblende and biotite crystals | 10 |
| 9. Plutonic-rock classification | 12 |
| 10. El Capitan Granite | 13 |
| 11. Varieties of granodiorite | 14 |
| 12. Diorite | 14 |
| 13. Dike of aplite crosscutting granodiorite | 15 |
| 14. Porphyritic texture in the Cathedral Peak Granodiorite | 15 |
| 15. Aligned dark inclusions in granodiorite | 16 |
| 16. Schlieren, layered concentrations of dark minerals | 16 |
| 17. Features that determine the relative ages of plutonic rocks | 17 |
| 18. Bird’s-eye view of Yosemite Valley | 18 |
| 19. Diorite dikes on the face of El Capitan | 19 |
| 20. Evolution of the Tuolumne Intrusive Suite | 20 |
| 21. Johnson Granite Porphyry | 21 |
| 22. Final stages in the evolution of the Tuolumne Intrusive Suite | 21 |
| 23. Contorted chert beds along the Merced River | 22 |
| 24. Metamorphic rocks with relict sedimentary bedding | 23 |
| 25. Interior of the Earth | 24 |
| 26. Major plates of the world today | 25 |
| 27. Three principle kinds of plate motion | 25 |
| 28. Oceanic plate subducted beneath continental plate | 27 |
| 29. Uplift and tilt of the Sierran block | 28 |
| 30. Ancient channel of the Tuolumne River | 29 |
| 31. Volcanic mudflow deposit | 29 |
| 32. Columnar joints in basalt at the “Little Devils Postpile” | 29 |
| 33. Regional joints shown on aerial photograph | 30 |
| 34. Inclined joints determine the slope of Three Brothers | 31 |
| 35. Staircase Falls follow inclined joints | 31 |
| 36. Rectangular blocks formed in the El Capitan Granite | 32 |
| 37. The Rockslides and El Capitan | 32 |
| 38. Bold exposure of the Half Dome Grandiorite beneath Glacier Point | 33 |
| 39. Progressive rounding of massive granite by exfoliation | 34 |
| 40. Sheet joints follow topographic surfaces | 34 |
| 41. Undulating surface below Clouds Rest | 35 |
| 42. Royal Arches, a gigantic expression of sheet jointing | 35 |
| 43. Weathering of joint blocks and formation of corestones | 36 |
| 44. Spheroidal weathering around corestones | 36 |
| 45. Weather pans formed on the summit of North Dome | 37 |
| 46. Resistant potassium feldspar phenocrysts | 37 |
| 47. Knobs of resistant diorite protrude from weathered rock surface | 38 |
| 48. Natural bridge formed from resistant aplite | 38 |
| 49. Rockfall that blocked the El Portal Road | 38 |
| 50. Deeply incised canyon of the Merced River | 39 |
| 51. Uplift and stream incision over time | 39 |
| 52. Maclure Glacier, showing annual layers of ice accumulation | 40 |
| 53. Valley glacier, showing accumulation and wastage areas | 40 |
| 54. Roche moutonnee, showing the influence of jointing on its development | 41 |
| 55. Imprints on the rock left by passing debris-laden ice | 41 |
| 56. Mountain crest, showing glacial sculpture | 42 |
| 57. Jagged unglaciated spires of Unicorn Peak | 43 |
| 58. Valley modification by glacial erosion | 42 |
| 59. Bridalveil Fall, issuing from a hanging valley | 43 |
| 60. Glacial till, an unsorted mixture of debris | 44 |
| 61. Glacial erratic left behind as the ice melted | 44 |
| 62. Moraines formed by valley glacier | 45 |
| 63. Moraines in Lee Vining Canyon | 45 |
| 64. Tioga moraine with sharp crest and abundant boulders | 46 |
| 65. Tahoe moraine with subdued crest and scattered boulders | 46 |
| 66. Perched erratic from pre-Tahoe glaciation | 47 |
| 67. Tioga icefield and valley glaciers | 47 |
| 68. U-shaped glaciated valley | 48 |
| 69. Glacial polish high on Fairview Dome | 49 |
| 70. Pothole Dome, a large roche moutonnee | 49 |
| 71. Potholes angling up the side of Pothole Dome | 49 |
| 72. Subglacial water polish on Pothole Dome | 49 |
| 73. Kettles, small lake-filled depressions | 50 |
| 74. Glacial moraines in Yosemite Valley | 51 |
| 75. Glaciers come and go in the Yosemite Valley area | 51 |
| 76. Pre-Tahoe glaciation, its extent in the Yosemite Valley area | 52 |
| 77. Dana Plateau, unglaciated remnant of an ancient land surface | 53 |
| 78. Boulder-strewn upland surface on Dana Plateau | 53 |
| 79. West shoulder of Mount Hoffmann | 54 |
| 80. Lyell and Maclure Glaciers, 1972 | 55 |
| 81. Lyell and Maclure Glaciers, 1883 | 55 |
| 82. Dana Glacier, 1975 | 56 |
| 83. Dana Glacier, 1908 | 56 |
| 84. Avalanche chutes and talus cones in Lee Vining Canyon | 57 |
| 85. The Slide on Slide Mountain | 57 |
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