IV TABLE OF CONTENTS. 



Page. 

 Hbpokt of a. C. Peale— Continued. 



Report on the geology of tlie Green River District — Continued. 



Chapter IV. Descriptive geology — Snake River drainage area 543 



Jolin Day's River 543 



Salt River Range 545 



Salt River 551 



Blackfoot Basin , 556 



Portneuf River 563 



Marsh Creek 565 



Portuexif Range 567 



Baunack Range 570 



Chapter V. Descriptive geology — Bear River drainage area 573 



Bear River 573 



Upper Bear River Valley 573 



Smith's Fork of Bear River 577 



Suhlette Range 580 



Thomas' Fork , 581 



Bear Lake Plateau 582 



Bear Lake Valley 587 



Preuss Range 589 



Soda Springs and Bear River Bend 590 



Soda Springs Valley 596 



Soda Springs Hills 596 



Basalt Valley 597 



Bear River Range , 598 



Gentile Valley 600 



Middle Cauon of Bear River 602 



Cache Valley 603 



Malade Range 606 



Malade Valley 608 



Blue Spring Hills -. 609 



Chapter VI. R«Ssum6 of the geographical formations of the district 611 



General section 612 



ArchsBan rocks 613 



Palaeozoic rocks 613 



Silurian 613 



Carboniferous 616 



Palaeozoic orography 620 



Mesozoic rocks 621 



Jura Trias 622 



Cretaceous 629 



Post-Cretaceous 629 



Mesozoic and Post-Cretaceous orography 632 



Cenozoic rocks , 634 



Tertiary 634 



Wahsatch Group 1 635 



Green River Group 637 



Bridger Group 639 



Pliocene deposits 640 



Tertiary orography 640 



Quaternary 641 



Volcanic rocks 643 



Appendix 645 



A. — Minerals of the district 645 



B. — Catalogue of rocks 646 



PART II.— TOPOGRAPHY. 



Report of A. D. Wilsox, Chief ToPoaEAPHER [1 map]. 



Letter of transmittal 649 



Report on the primary triaugulation of 1877 and 1878 ., 651 



Measurement of the Rawlins base-line 651 



Report on the j)rimary triaugulation of 1878 655 



Report op Henry Gannett, M. E., Topographer : 



Letter of transmittal 673 



Report of Henry Gannett, M. E. : 



Chapter I 675 



Methods of work 675 



Metliods of survey 675 



