/,' ti. 



TABLE OF CONTENTS. 



Page. 



Title I 



Table of contents lu 



Mst of illustrations vii 



Report of F. V. Hayden ix 



Letter to the Secretary ix 



PART I.— GEOLOGY AND PALEONTOLOGY. 



Report op F. M. Endlich, S. N. D. [Plates I- VI] 3 



Report on the geology of the Sweetwater District 5 



Itinerary 5 



Chapter I. Introduction ; topography ; drainage ; lakes ; Indians ; settle- 

 ments, «fec. ; vegetation ; same 41 



Chapter II. Geology of the Wind River Range and country eastward . . 64 



Chapter III. Geology of the Sweetwater Valley and adjacent regions.. 95 



Chapter IV. Geology of the depressed Southern Area 119 



Chapter V. Economic geology of the Sweetwater District 142 



Conclusion 152 



Table of formations 154 



Appendix : Catalogue of minerals occi;irring in the Sweetwater Dis- 

 trict 157 



Report OP C. A. White, M. D. [Plates 1-10] 159 



Report on the palseontological field-work for the season of 1877 161 



Contributions to invertebrate palaeontology. No. 1 : 



Cretaceous fossils of the Western States and Territories 273 



Rbport of Orestes St. John, Geologist op the Tipton Division [Plates 



VII-XLVI] 321 



Report of the geological field-work of the T6ton Division 323 



Chapter I. Area and boundaries 323 



Chapter II. Southwestern section 327 



Chapter in. The T^ton or Middle section 411 



Chapter IV. The Eastern section 442 



Chapter V. Archaean areas 474 



Report op A. C. Peale, M. D., Geologist of Green River Division [Plates 

 XLVII-LXXVI] : 



Letter of transmittal 509 



Report on the geology of the Green River District : 



Chapter I. General introduction 511 



Area 511 



Former geological explorations 511 



Drainage, mountains, &c 512 



Geological formations 515 



Chapter II. Itinerary 516 



Green River City to Granger 516 



Granger to Fort Hall 517 



Fort Hall to Franklin 519 



Franklin to Ogden 521 



Chapter III. Descriptive geology — Green River drainage area 523 



Green River Basin 523 



Wind River Mountains 524 



Drainage 525 



Oyster Ridge 533 



Ham's Fork Basin 534 



Ham's Fork Plateau 534 



Absaroka Ridges , 536 



Meridian Ridge 536 



Fontenello Hogbacks 538 



Thompson Plateau 539 



Meridional Valley 539 



Wyoming Range 541 



in 



