CHAPTER I. 



EOOKY MOUNTAINS. 



Section T. COLORADO RANGE— Physical aspect op th^ Great Plains- 

 Physical DESCRIPTION OF THE LaRAMIE HiLLS — ArCH^AN GEOLOGY — 



Physical description of the Colorado Arch^an body— Geology — 

 Eastern foot-hills — Paleozoic formations — Triassic formation— Ju- 

 rassic FORMATION — DAKOTA CRETACEOUS^COLORADO CRETACEOUS — DESCRIP- 

 TIVE GEOLOGY OF THE EASTERN FOOT-HILLS— CRETACEOUS PLAINS OP COLO- 

 RADO — Tertiary plains of Wyoming. 



Section II.— LARAMIE PLAINS— Physical description— General geology — 

 CoMo anticlinal. 



Section III.— MEDICINE BOW RANGE— Physical description- Geological 

 DESCRIPTION — Conclusions. 



Section IV. — ^NORTH PARK — Physical description — Paleozoic and Mesozoic 



FORMATIONS — VOLCANIC ROCKS — ^TERTIARY BEDS. 



Section V. — PARK RANGE — Physical description — Geological description. 



Section VL— CRETACEOUS REGION FROM COMO TO SEPARATION— Val- 

 ley OF THE Medicine Bow River — Carbon Basin — Elk Mountain region — 

 Valley of the North Platte River. 



Section VII.— WEST OF NORTH PLATTE RIVER— Bridger's Pass region— 

 Rawlings Peak uplift— Savory Plateau region. 



Section VII[.— ELKIIEAD MOUNTAINS— General discription- Trachytic 

 REGION — Basaltic region. 



Skction IX. — Valleys of the Yampa and Little Snake Rivers. 

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