Figures
William R. Keefer
Page
Frontispiece
Midway Geyser Basin
II
Plate 1.
Geologic map of Yellowstone National Park
36
Figure 1.
Geographic map of Yellowstone National Park
2
2. Index map showing photograph localities
3
3. Skyline of the Gallatin Range in northwestern Yellowstone National Park
6
4. View north along the Yellowstone River and Hayden Valley toward the Washburn Range
6
5. The rocks of Yellowstone National Park
8
6. The geologic time scale
10
7. View downstream along the Lamar River and closeup view of Precambrian gneiss
12
8. Positions of seaways and landmasses during the middle part of Permian time
14
9. Crowfoot Ridge in the southern Gallatin Range
15
10. Mount Everts
16
11. The faunal succession in sedimentary rocks
17
12. Beds of limestone along Pebble Creek and closeup views of outcrop and fossils
18
13. Common kinds of geologic structures produced by deformation of the earth’s crust
20
14. Geologic structures in Yellowstone National Park
22
15. Intrusive and extrusive igneous rock bodies
24
16. The Absaroka volcanoes and their rocks
25
17. Massive beds of volcanic breccia of the Absaroka volcanic rocks and closeup view of outcrop
26
18. Massive layered breccias of the Absaroka volcanic rocks at Barronette Peak
28
19. Giant petrified tree trunks in Yellowstone’s fossil forest
29
20. Closeup view of a specimen of intrusive igneous rock
30
21. Bunsen Peak, a body of intrusive igneous rock
31
22. Outline of the Yellowstone caldera
35
23. Various stages in the development of the Yellowstone caldera
40
24. Extent of the rhyolite welded tuffs that once covered Yellowstone National Park
42
25. The Yellowstone Tuff at Golden Gate and closeup views of tuff specimens
43
26. Cross section through the Mount Washburn-Canyon area, showing relationships along north edge of the Yellowstone caldera
44
27. View southeast across Yellowstone Lake toward the Absaroka Range
45
28. Radar image of lava flows in southwestern Yellowstone National Park
46
29. Obsidian Cliff
47
30. Thick rhyolite lava flow along Firehole River and closeup view of specimen
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31. Brecciated lava flows
49
32. Outcrop and closeup view of glassy rhyolite lava
50
33. Basalt flows at Tower and closeup views of outcrop and specimen
52
34. Giant glacial boulder of Precambrian gneiss at Inspiration Point
54
35. Glacial terrain along the Northeast Entrance Road
56
36. Typical profiles of canyons cut by stream erosion and glaciation
57
37. Aerial oblique view of Electric Peak
58
38. Extent of ice in Yellowstone National Park during the maximum spreading of the Pinedale glaciers
60
39. Beds of sand, silt, and clay deposited in a glacially dammed lake in Hayden Valley
61
40. Waterfalls in Yellowstone National Park
62
41. Grand Canyon and Lower Falls of the Yellowstone River
65
42. Various stages in the development of the Grand Canyon of the Yellowstone
66
43. Common kinds of thermal features in Yellowstone National Park
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44. Norris Geyser Basin, showing solid floor of hot spring deposits
72
45. Diagram of a thermal system
72
46. Infrared image of a portion of Upper Geyser Basin
73
47. Mound of geyserite (sinter) at Ca
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