710 REPORT UNITED STATES GEOLOGICAL SURVEY. 



the purpose of locating routes for wagon-roads from South Pass west- 

 ward. These were made by the Interior Department and were in charge 

 of Mr. F. W. Lander. By combining the topographical work of the 

 different parties engaged, a map, on a scale of nine miles to one inch, of 

 the area here treated of was made. This map, though containing many 

 grave errors in position, was by far the best and most detailed map of 

 any considerable area in the West at that time. 



In 1873, Capt. W. A. Jones led a reconnaissance up the Big Sandy, 

 on his way to the Yellowstone National Park, without, however, adding 

 anything to our knowledge of the section of country under consideration. 



tn 1871, the boundary line between Utah and Idaho was run, estab- 

 lishing with some exactness the parallel of 42°. I was fortunate enough 

 to be enabled to make trigonometric connection with the corner post as 

 established by this survey to indicate the northeast corner of Utah and 

 the southeast corner of Idah 3. Belative to my own work, the corner 

 stands 0.78 miles too far east, while in latitude it is practically correct. 



The west boundary of Wyoming was run in the summer of 1873. I 

 succeeded in connecting a stake on this boundary with our geodetic 

 work and found the discrepancy to be but 0.16 miles, or 845 feet, which 

 was entirely in longitude. This stake was a few miles south of the 

 Utah-Idaho corner. 



