66 EEPORT UNITED STATES GEOLOGICAL SURVEY. 



White and Grand is but 12 miles distant, and there several creeks in our 

 district reach the Grand without leaving it. Among tbem Kifle Creek 

 is the most prominent. This heads near station 4, and flows in a gen- 

 eral southwestern course until it enters the Grand. Eoan, Salt, and Bit- 

 ter Creeks merely reach our district with their head- water drainage, 

 and, following a course east of south, join the Gr«nd at varying inter- 

 vals of space. These southern streams carry more water, *. e., water 

 for a greater distance in miles, than the northward-flowing tributaries 

 of the White. While treating of the stratigraphy'- of the entire region 

 this will be discussed. 



Summarizing the approximate lengths of water-courses contained in 

 our district, and heading within its limits, we arrive at a result which 

 shows that the length of the main streams is a comparatively large one, 

 as compared with the area. Did all the streams contain water through- 

 out the entire distances of their courses the region would be amply sup- 

 plied with moisture. As it is, however, it is dry. 



WHITE RIVER DRAINAGE. 



Miles. 



Length of "White River within district 120 



■Cattle Creek ,-. 15 



Pi-ce-ance Creek 45 



Douglas's Creek 35 



Evacuation Creek 30 



Asphalt Wash ---. IB 



Total - 263 



Bitterwater Fork • 22 



Two Water Creek 18 



Sweetwater Fork 19 



Dickerson's Creek 32 



Total - 354 



GRAND RIVER DRAINAGE. 



Nameless Creek 22 



Rifle Creek 17 



Roan Creek 32 



•Salt Creek 27 



Bittt r water Creek 30 



Desert Creek 32 



Total 160 



Along nearly all of these main tributaries of the two rivers we found 

 Indian trails, greatly facilitating travel, and frequently leading to 

 springs which could scarcely have been found' without their guidance. 

 It is improbable that much travel should ever occur in that region, but 

 for casual travellers the trails will prove to be of invaluable service. 



TOPOGRAPHY. 



» 



The larger portion of the district is, viewed as a whole, simply an ex- 

 tensive plateau, which slopes to the north. Topographically it is a con- 

 tinuation of the Grand Mesa south of the Grand River. As generally 

 is the case, so here, too, the geological formations prove to exhibit cer- 

 tain types of orographic features. We find in the eastern portion of 

 the district that the mesozoic group is represented, and that there the 

 country is more irregularly broken than farther west. A long line 

 of heavy hogbacks stretches in a general direction a little east of south 

 from the White to the Grand. At several places streams cut through 

 this hogback, flowing westward. On its eastern face it is steep, generally 



