ILLUSTRATIONS. VII 



FIGURES. 



Page. 

 Figure 1. Map of Colorado and part of Utah, showing areas covered by 

 United States Geological Survey topographic maps and 

 geologic folios xr 



2. Dakota hogback and mountain front north of Plainview, as 



seen from the " Moffat road " 8 



3. Arch of the Front Range restored 9 



4. Diagrams showing effect of stream and glacial erosion 11 



5. Dakota hogback south of South Platte River 19 



6. Section at mouth of Platte Canyon 25 



7. Castle Rock from the north 26 



8. Sketch section through Palmer Lake, showing fault 32 



9. Section at Pikeview, showing the fault that separates the rocks 



of the plains from those of the mountains 33 



10. Section through Garden of the Gods 37 



11. Profile section through Pikes Peak and Cascade, showing the 



relation of the mountain peak to the lower land (peneplain) 



on either side 44 



12. Sections showing supposed outline of the Cripple Creek vol- 



cano .50 



13. Section showing fault at foot of Cheyenne Mountain .53 



14. State of .lefferson, as it was proposed in 1858 63 



15. Sandstone bed at base of coal-bearing formation at crossing of 



Arkansas River near mouth of Oil Creek 70 



16. Section from Canon City to Parkdale, showing former extent 



of the Dakota and Morrison formations and the pinching out 

 westward of the lower formations 80 



17. Cross section of the Sangre de Cristo Range and the valley on 



its east side, at Pleasanton, showing the anticline of the moun- 

 tain and the syncline on the east 85 



18. Lava-capped hill south of Howard 86 



19. Section of the Sangre de Cristo Range and the valley on its 



east side, through Hunts Peak and Howard 88 



20. Ideal section from Sawatch Range to Brown Canyon, show- 



ing the deep gravel fiUing in the old channel of the Arkan- 

 sas 92 



21. Sketch map of Brown Canyon, showing its relation to the 



granite and the gravel 92 



22. Mount Yale from Nathrop— 94 



23. Great cirque on Mount Harvard 99 



24. Mountain peaks of Sawatch Range at the head of Lake Creek, 



as seen from milepost 265 103 



25. The Mosquito Range as seen from milepost 269, at the mouth of 



Iowa Gulch 103 



26. Mineral production of Lake County from 1877 to 1918, inclu- 



sive 107 



27. Section through some of the workings at Leadville, showing the 



relation of the ore to the limestone, porphyry, and quartzite_ 108 



28. Section across Eagle Park, showing the thin cap of quartzite 



on the west and the same bed dipping into the base of the 



slope on the east 114 



29. Meanders of Eagle River in Eagle Park near Deen 114 



30. Sketch map showing old and new moraines above Minturn__ 120 



