CONTENTS.  9 
Page. 
Chapter  XIII.  The  Cordilleras — Continued. 
Section  4.  Utah 779 
Summary  of  literature 779 
Uinta   Mountains 77! » 
Wasatch  Mountains 782 
Promontory    Ridge,    Fremont    Island,    and   Antelope    Island 
ranges 789 
Raft   River   Range 789 
Summary  of  present  knowledge 789 
Uinta    Mountains 789 
Wasatch  Mountains 790 
Promontory  Ridge,  Fremont  Island,  and  Antelope  Island 791 
Section  5.  Nevada 791 
Summary  of  literature 791 
Summary  of  present  knowledge 1 799 
Section   6.  Colorado 800 
Summary  of  literature 800 
Front  Range  north  and  east  of  the  Arkansas 800 
Wet  and  Sangre  de  Cristo  mountains 812 
Park    Range 814 
Sawatch  and  Elk  ranges  and  adjacent  parts  of  Arkansas  and 
Gunnison  valleys 815 
Grand  and  Gunnison  rivers 818 
Southwestern  Colorado,  including  the  San  Juan,  Needle,  and 
La  Plata  mountains 819 
Summary  of  present  knowledge 824 
Colorado,  general 824 
Introductory  note 824 
General  statement -___  824 
Ancient  gneisses  and  schists 825 
Greenstone  schists  and  allied  rocks 825 
Pre-Cambrian    sediments ^ _ 825 
Massive   igneous   rocks 826 
Front    Range 826 
Wet  and  Sangre  de  Cristo  ranges 828 
Park    Range 828 
Sawatch  Range  and  adjacent  valleys 829 
Grand  and  Gunnison  valleys 829 
Needle  Mountains  and   vicinity 829 
General  statement 829 
Archean  gneisses  and  schists 830 
Irving   greenstone 830 
Needle   Mountains   group s:'-i 
Intrusive  granites  and  other  rocks 831 
Uncompahgre    Canyon 832 
Rico  Mountains 832 
La  Plata  Mountains 832 
Correlation s;,>;; 
Section  7.  Wyoming s:>""> 
Summary  of  literature —  833 
Laramie,    Medicine    Bow,    and    Park    ranges    in    southern 
Wyoming 833 
