U.S. GOVERNMENT PRINTING OFFICE: 1975
Library of Congress Cataloging in Publication Data Lohman, Stanley William, 1907- The geologic story of Arches National Park. (Geological Survey Bulletin 1393) Bibliography: p. Includes index. Supt. of Docs. no.: I 19.3:1393 1. Geology—Utah—Arches National Park—Guide-books. 2. Arches National Park, Utah—Guide-books. I. Title. II. Series: United States Geological Survey Bulletin 1393. QE75.B9 No. 1393 [QE170.A7] 557.3′08s [557.92′58] 74-23324
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Contents
Page [Beginning of a monument] 1 [Graduation to a park] 5 [Early history] 9 [Prehistoric people] 9 [Late arrivals] 12 [Geographic setting] 18 [Deposition of the rock materials] 20 [Bending and breaking of the rocks] 24 [Uplift and erosion of the Plateau] 33 [Origin and development of the arches] 37 [Examples of arches] 46 [How to see the park] 50 [A trip through the park] 52 [Colorado River canyon] 52 [Headquarters area] 57 [Courthouse Towers area] 63 [The Windows section] 68 [Delicate Arch area] 74 [Fiery Furnace] 79 [Salt Valley and Klondike Bluffs] 82 [Devils Garden] 83 [Summary of geologic history] 98 [Additional reading] 104 [Acknowledgments] 105 [Selected references] 105 [Index] 109
Figures
Page [Frontispiece. Balanced Rock.] [1. Arches National Park] 6 [2. Rock art in Arches National Park] 11 [3. Wolfe’s Bar-DX Ranch] 14 [4. Rock column of Arches National Park] 21 [5. Common types of rock folds] 25 [6. Common types of rock faults] 26 [7. Paradox basin] 27 [8. Geologic section across northwest end of Arches National Park] 28 [9. Index map of northwestern part of Arches National Park] 28 [10. Gravity anomalies over Salt Valley] 31 [11. Tilted block of rocks in Cache Valley graben] 34 [12. Jointed northeast flank of Salt Valley anticline] 36 [13. Index map] 38 [14. Tunnel Arch] 43 [15. “Baby Arch”] 44 [16. Broken Arch] 45 [17. Double Arch] 47 [18. Pothole Arch] 48 [19. Glen Canyon Group] 53 [20. Navajo Sandstone cliffs] 54 [21. Mouth of Salt Wash] 55 [22. Southeast end of faulted Cache Valley anticline] 56 [23. Faulted Seven Mile-Moab Valley anticline] 58 [24. Three Penguins] 59 [25. Moab Valley] 60 [26. Faulted wall of Entrada Sandstone] 61 [27. Park Avenue] 62 [28. Balanced rocks on south wall of Park Avenue] 64 [29. Courthouse Towers] 65 [30. The Three Gossips] 66 [31. Sheep Rock] 66 [32. Petrified sand dunes] 67 [33. “Hoodoos and goblins”] 68 [34. Eye of The Whale] 69 [35. Intricate crossbeds in Navajo Sandstone] 70 [36. Cove Arch and Cove of Caves] 71 [37. North Window] 72 [38. Looking southwestward through North Window] 73 [39. South Window] 74 [40. Turret Arch] 75 [41. Parade of Elephants] 76 [42. Suspension foot bridge across Salt Wash] 78 [43. Delicate Arch] 78 [44. Fiery Furnace] 80 [45. Trail to Sand Dune Arch] 81 [46. Sand Dune Arch] 82 [47. Tower Arch] 84 [48. Skyline Arch] 85 [49. Campground in Devils Garden] 86 [50. View north from campground] 87 [51. Southeastern part of Devils Garden trail] 88 [52. Pine Tree Arch] 89 [53. Landscape Arch] 91 [54. Navajo Arch] 92 [55. Partition Arch] 93 [56. Double O Arch] 93 [57. Dark Angel] 94 [58. “Indian-Head Arch”] 95 [59. Geologic time spiral] 96
