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TABLE OF CONTENTS. 



Page. 



Introductory Letter — xi 



Letter to the Geologist in Charge xiii 



Chapter L Eocky Mountains 1 



Section L Colorado Eange. By Arnold Hague 2 



II. Laramie Plains. By Arnold Hague • 73 



III. Medicine Bow Eange. By Arnold Hague. . . 94 



IV. North Park. By Arnold Hague 112 



V. Park Eange. By Arnold Hague 130 



VI. Cretaceous Eegion from Como to Separa- 



tion. By Arnold Hag QE 142 



VII. West or North Platte. By S. F. Emmons . . . 156 

 VIII. Elkhead Mountains. By S. F. Emmons 167 



IX. Valleys of the Yampa and Little Snake 



EiVERS. By S. F. Emmons 181 



Chapter II. Green Eiver Basin. By S. F. Emmons 191 



Section I. Physical Description 191 



II. General Geology 198 



III. Descriptive Geology of the Basin Eegion.. 207 



IV. Descriptiye Geology op the Mountain 



Eegion.. 254 



V. Tertiaries op the Uinta Valley 307 



Chapter III. Utah Basin 311 



Section I. Western Uinta Eange. By S. F. Emmons . 311 



II. From Aspen to Echo City. By S. F. Emmons. 326 



III. Wahsatch Eange. By S. F.Emmons 340 



IV. Northern Wahsatch Eegion. By Arnold 



Hague V. 393 



V. Eegion north of Salt Lake. By Arnold 



Hague 420 



VI. Lake Eegion. By S. F. Emmons 431 



VII. Eegion souts of Salt Lake. By S. F. 



Emmons 443 



VIII. Desert Eegion. By S. F. Emmons 462 



vn 



