CONTENTS. XV 



Page. 

 Descriptive geology of the Mosquito Kauge — Coutiuued. 



Noitheasteru division- — Continued. 



Mounts Cameron and Bross llij 



Redampbitbeater 119 



Kasteru foot-bills 122 



Buckskin ampbitbeater 123 



North Mosquito ampbitbeater 125 



Middle-eastern division 12G 



Glacial erosion 126 



Buckskin section 128 



Loveland Hill KiO 



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 Loudon fault 144 



Sacramento arch 147 



Gemini Peaks 149 



Little Sacramento gulch l.jl 



Spring Valley — Horseshoe gulch 152 



While Ridge 153 



North wall of Horseshoe gulch 155 



Four-Mile amphitheater 1.58 



The Horseshoe 160 



South wall of Horseshoe gulch 161 



Lamb Mountain 103 



Sheep Mount;, in 165 



Southern division 169 



Sheep Ridge 169 



Black Hill ITO 



Twelve-Mile Creek 171 



Weston's pass 173 



South Peak Ridge 174 



Western slopes 175 



AVeston 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 Ziou 186 



Tennessee Park 189 



East Arkansas Valley 11*0 



Buckeye Peak 193 



Chalk Mountain 194 



Upper Ten-Mile Valley 197 



Mosquito fault 198 



Arkansas amphitheater 199 



Ten-Mile and Clinton amphitheatera 201 



