CONTENTS. XV 



Page. 

 Descriptive geology of the Mosquito Range Continued. 



Northeastern division Continued. 



Mounts Cameron and Bross 115 



Red amphitheater 119 



Eastern foot-hills 122 



Buckskin amphitheater 123 



North Mosquito amphitheater 125 



Middle-eastern division 126 



Glacial erosiou 126 



Buckskin section 128 



Loveland Hill 130 



North Mosquito section 131 



South Mosquito section 133 



Pennsylvania Hill 135 



London fault 136 



Main crest from Mosquito Peak to Mount Evans 139 



South Mosquito amphitheater Sacramento amphitheater 140 



London Hill 141 



Pennsylvania Hill west of London fault 144 



Sacramento arch 147 



Gemini Peaks 149 



Little Sacramento gulch 151 



Spring Valley Horseshoe gulch 152 



White Ridge ". 153 



North wall of Horseshoe gulch 155 



Four-Mile amphitheater 158 



The Horseshoe 160 



South wall of Horseshoe gulch 161 



Lamb Mountain 163 



Sheep Mountain ^ 165 



Southern division 169 



Sheep Ridge 169 



Black Hill 170 



Twelve-Mile Creek 171 



Weston's pass 173 



South Peak Ridge 174 



Western slopes 175 



Weston fault Empire Hill 176 



Empire gulch 181 



Main crest north of Ptarmigan Peak 182 



Lake beds 183 



Northwestern division 184 



Prospect Mountain 184 



Mount Zion Porphyry 185 



Mount Zion -. 186 



Tennessee Park 189 



East Arkansas Valley , 190 



Buckeye Peak 193 



Chalk Mountain 194 



Upper Ten-Mile Valley 197 



Mosquito fault 198 



Arkansas amphitheater 199 



Ten-Mile and Clinton amphitheaters 201 



