3G4 eepoet' united states geological survey. 



In passing on to the southwest through this gently undulating portion 

 of the country without any boldly expressed drainage system, we pass 

 on our right a complicated cluster of buttes sloping like all the rest of 

 the upheavals in this region toward the north and northwest, showing 

 also abrupt faces on the south side. Seven miles beyond we arrive at 

 the Yellow Jacket Pass, which constitutes the lowest saddle in the third 

 and last ridge of hills north of the White Eiver Yalley. From this pass 

 we march for six miles through pretty rugged caiions and descend finally 

 into the White Eiver Yalley, which we enter at Simpson's Park only 

 some five or six miles from the White River agency house. Arriving 

 tit the latter place on August 28, after marching ten consecutive 

 days, preparations were made to commence field-work at once, and after 

 a few days of work geodetic connection with the survey of 1875 was 

 satisfactorily effected. We followed, then, the usual order of working 

 through tbe district assigned to us. 



