Till CONTENTS. 



LIST OF ILLUSTHATIONS. 



KEPORT OP F. V. HAYDEN. 



Flates. 

 So. , racing page— 



1. Dike atValmont, ei^d-view. \ 28 



2. Ideal section of dike ) 



3. Irregular layers of deposition, Saint Vrain's Creelj 31 



5* > Rock monuments, Monument Park, Colorado - 32 



6. Crushed strata \ 34 



7. Oblique lamina^. J 



8. Cathedral Eocks, Garden of the Gods, Colorado 36 



9. East side, granite anticlinal, Upper Arkansas Valley 48 



10. Upper Twin Lake, Colorado 50 



11. Map of Twin Lakes - 52 



12. Gothic Mountain 60 



13. Italian Mountain 60 



14. Teocalli Mountain • 62 



15. Irregular bedding of Carboniferous sandstone on Eagle Eiver 70 



16. Overturned strata, Elk Mountains } ^2 



17. Roches Mou tonuses - ) 



18. Mountain of the Holy Cross 74 



Sections. 



Section I. Southern end of anticlinal on Big Thompson Creek ? ^q 



Section II. Section on Saiut Vrain's Creek ^ 



Section III. Section at Platte Canon ) 



^ Section IV. Looking north from near divide between Platte and Arkansas > 30 

 ( Rivers - ) 



KEPORT OF ARCH. R. MARVINE. 



Flates. 

 (Folded.) 



I. Detail geological sections of the lower sedimentary rocks found along the 



eastern base of the Rocky Mountains from the Little Thompson to the 

 South Platte 93 



Sec. 1. Little Thompson. 



Sec. 2. Bear Canon. 



Sec. 3. Ralston Creek. 



Sec. 4. Golden City. 



Sec. 5. Bear Creek. 



Sec. 6. South side of South Platte, 



II. Geological sections along the eastern base of the Rocky Mountains, from Big 

 Thompson Creek to South Platte Canon . 136 



III. Geological sections in the Middle Park 192 



Figures. 



No. 1. Diagram showing the relations of the Sedimentary rocks of the plains '* 



to the Archfean rocks of the mountains 94 



No. 2. Esamplo of irregular junction between the Archgean schists and Trias- 



sic conglomerates and shales near Turkey Creek ; J. T. Gardner 96 



No. 3. To illustrate the shelviug-off, or overlays, of the Triassic sandstones on 



the Arcbtean, at Dry Creek, between the Big and Little Thompson Creeks . . 96 

 No, 4, (folded,) (misnamed Plate IV.) Map of the coal-openings, railroad-sections, 



&c., along the eastern base of the mountains, near Denver City 120 



No. 5. Golden City and the Table Mountains, viewed from a point six miles 



south ; Wm. H. Holmes 130 



No. 6. Diagram showing the outcrop of beds around the southern end of an 



6chelon fold , 132 



No. 7. Structural map of the eastern slope of the Front range 146 



