GEOLOGICAL SUEVEY OF THE TE*EEITOEIES. 81 



of August last. Two belts of country have been explored : 1. North of 

 the railroad by way of North Platte, Eed Buttes, Sweetwater, South Pass, 

 to Fort Bridger. 2. South of the railroad, from Fort Bridger via Henry's 

 Fork, Green River, Bitter Creek, Bridger's Pass, Medicine Bow Moun- 

 tains, Cheyenne Pass, to Cheyenne again. 



We shall occupy ourselves next with a description of the third or mid- 

 dle belt connecting the two already described, extending from Cheyenne 

 to Salt Lake Valley along the line of the Union Pacific Railroad. 



We shall also gather up some of the fragments from point to point 

 which may have been omitted, or not fully explained, in the preceding 

 portions of this report. 

 6 G 



