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The Geologic Story of Yosemite National Park (1987) by N. King Huber


ILLUSTRATIONS

Page
Frontispiece. Half Dome at sunset
 
Plate  1. Geologic map of Yosemite National Park and vicinityII
 2. Geologic map of the Yosemite Valley area66
 
Figure  1. Yosemite National Park area1
 2. The Sierra Nevada, an asymmetric mountain range2
 3. Summit of Mount Hoffmann, with Charles F. Hoffmann at the transit3
 4. Views from Mount Hoffmann4
 5. Panorama from Mount Hoffmann6
 6. Physiographic diagram of Yosemite National Park7
 7. Geologic time scale9
 8. Hornblende and biotite crystals10
 9. Plutonic-rock classification12
10. El Capitan Granite13
11. Varieties of granodiorite14
12. Diorite14
13. Dike of aplite crosscutting granodiorite15
14. Porphyritic texture in the Cathedral Peak Granodiorite15
15. Aligned dark inclusions in granodiorite16
16. Schlieren, layered concentrations of dark minerals16
17. Features that determine the relative ages of plutonic rocks17
18. Bird’s-eye view of Yosemite Valley18
19. Diorite dikes on the face of El Capitan19
20. Evolution of the Tuolumne Intrusive Suite20
21. Johnson Granite Porphyry21
22. Final stages in the evolution of the Tuolumne Intrusive Suite21
23. Contorted chert beds along the Merced River22
24. Metamorphic rocks with relict sedimentary bedding23
25. Interior of the Earth24
26. Major plates of the world today25
27. Three principle kinds of plate motion25
28. Oceanic plate subducted beneath continental plate27
29. Uplift and tilt of the Sierran block28
30. Ancient channel of the Tuolumne River29
31. Volcanic mudflow deposit29
32. Columnar joints in basalt at the “Little Devils Postpile”29
33. Regional joints shown on aerial photograph30
34. Inclined joints determine the slope of Three Brothers31
35. Staircase Falls follow inclined joints31
36. Rectangular blocks formed in the El Capitan Granite32
37. The Rockslides and El Capitan32
38. Bold exposure of the Half Dome Grandiorite beneath Glacier Point33
39. Progressive rounding of massive granite by exfoliation34
40. Sheet joints follow topographic surfaces34
41. Undulating surface below Clouds Rest35
42. Royal Arches, a gigantic expression of sheet jointing35
43. Weathering of joint blocks and formation of corestones36
44. Spheroidal weathering around corestones36
45. Weather pans formed on the summit of North Dome37
46. Resistant potassium feldspar phenocrysts37
47. Knobs of resistant diorite protrude from weathered rock surface38
48. Natural bridge formed from resistant aplite38
49. Rockfall that blocked the El Portal Road38
50. Deeply incised canyon of the Merced River39
51. Uplift and stream incision over time39
52. Maclure Glacier, showing annual layers of ice accumulation40
53. Valley glacier, showing accumulation and wastage areas40
54. Roche moutonnee, showing the influence of jointing on its development41
55. Imprints on the rock left by passing debris-laden ice41
56. Mountain crest, showing glacial sculpture42
57. Jagged unglaciated spires of Unicorn Peak43
58. Valley modification by glacial erosion42
59. Bridalveil Fall, issuing from a hanging valley43
60. Glacial till, an unsorted mixture of debris44
61. Glacial erratic left behind as the ice melted44
62. Moraines formed by valley glacier45
63. Moraines in Lee Vining Canyon45
64. Tioga moraine with sharp crest and abundant boulders46
65. Tahoe moraine with subdued crest and scattered boulders46
66. Perched erratic from pre-Tahoe glaciation47
67. Tioga icefield and valley glaciers47
68. U-shaped glaciated valley48
69. Glacial polish high on Fairview Dome49
70. Pothole Dome, a large roche moutonnee49
71. Potholes angling up the side of Pothole Dome49
72. Subglacial water polish on Pothole Dome49
73. Kettles, small lake-filled depressions50
74. Glacial moraines in Yosemite Valley51
75. Glaciers come and go in the Yosemite Valley area51
76. Pre-Tahoe glaciation, its extent in the Yosemite Valley area52
77. Dana Plateau, unglaciated remnant of an ancient land surface53
78. Boulder-strewn upland surface on Dana Plateau53
79. West shoulder of Mount Hoffmann54
80. Lyell and Maclure Glaciers, 197255
81. Lyell and Maclure Glaciers, 188355
82. Dana Glacier, 197556
83. Dana Glacier, 190856
84. Avalanche chutes and talus cones in Lee Vining Canyon57
85. The Slide on Slide Mountain57


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