Frontispiece. Balanced Rock II Figure 1. John Otto 2 2. John Otto’s Monument 4 3. Map of Colorado National Monument 6 4. Petroglyphs 9 5. Cave 14 6. Independence Monument 19 7. Rock Column of Colorado National Monument 20 8. Geologic Map 22 9. Block diagrams of early Proterozoic events 25 10. Petrified sand dunes 30 11. The Coke Ovens 31 12. Red Canyon 33 13. Thin-bedded Kayenta Formation 34 14. Kayenta Formation 36 15. Gap in the rock record 37 16. Entrada Sandstone 41 17. Moab Member of Entrada Sandstone 42 18. Mottled salmon-and-white Slick Rock Member 43 19. White Entrada Sandstone 44 20. Summerville Formation 46 21. Morrison Formation 48 22. Excavating type specimen of _Brachiosaurus altithorax_ Riggs 51 23. Skeletons of typical dinosaurs of Morrison Formation 52 24. Burro Canyon Formation and Dakota Sandstone 54 25. Mount Garfield 57 26. Photo index map 58 27. Common types of rock folds 62 28. Common types of faults 65 29. Ladder Creek monocline and Redlands fault 66 30. Lizard Canyon monocline 67 31. Kodels Canyon fault 68 32. Kodels Canyon fault 69 33. Geologic structures at Fruita entrance to Colorado National Monument 70 34. Probable drainage patterns and land forms near the Monument at four successive stages of development 74 35. Fallen Rock 81 36. Unaweep Canyon 82 37. Redlands fault 89 38.