554 REPORT UNITED STATES GEOLOGICAL SURVEY. 



down both strikes on the map, it seems probable that they connect the 

 two localites. 



Crow Crecl\ — Crow Creek rises opposite tlie head of Preuss Creek. 

 It receives its water mainly from the eastern side of the Prenss Range. 

 In this portion of its course the creek flows northward. The range on 

 the west is composed of Carboniferous limestones in almost vertical 

 position, dipping about S0° or 85° to the eastward. On the east side of 

 the creek occur the beds that have been noted on Beaver Creek. The 

 relation between them and the limestones of the range could not be de- 

 termined. I think that between Beaver Creek and Crow Creek there is 

 a synclinal and perhaps an anticlinal. On receiving a large branch from 

 the Preuss Range, Crow Creek turns eastward, and soon crosses the anti- 

 clinal of the head of Beaver Creek. A few miles below, two creeks come 

 in nearly opposite each other. The one from the south occupies the 

 synclinal noted at the two locations made in the bend of Beaver Creek. 

 Between this point and the valley of Salt River there are two anticlinals 

 and a broad synclinal. The eastern anticlinal forms a rounded hill 

 facing Salt River Valley. It is composed of greenish-gray sandstones. 

 The section from this hill to the beds of the central portion of the anti- 

 clinal is the following : 



Section No. 18. 



1. Greenish-gray sandstones with bands of shale. 



2. Purplish and reddish sandstones. 



3. Conglomerates. 



4. Red sandstones. 



5. Gray shales. 



The red sandstones, ~No. 4, and conglomerates, No. 3, are probably the 

 same as noted on Beaver Creek. 



On the north branch of Crow Creek the conglomerates dip eastward 

 on the east side. On this creek, near the main stream, there are remnants 

 of old spring deposits forming dams of calcareous tufa across the creek. 

 The beds on the west side clip west. On a station at the south end of the 

 ridge, Mr. Mushback observed limestones, probably Carboniferous ; and 

 on a station north of this, but probably east of the axis line of the ridge, 

 Mr. Gannett noted sandstones, but of what age I could not determine. 



The valley on this branch of Crow Creek is broad and well grassed. 

 A number of small branches come in from the west. 



Smoking Creek. — This is the only large branch of Salt River not yet 

 described. It drains the country north of Crow Creek, and consists of 

 two principal branches, one coming from the north having its sources 

 opposite those of the Blackfoot River, and the second coming from the 

 south through a broad valley similar to the one on the branch of Crow 

 Creek last described. When these two streams unite the direction is 

 changed to east, and the stream formed forces its way to Salt River 

 through a canon cut in low rolling hills. It is in this region that the 

 salt beds occur, from which Salt River derives its name. On the west 

 side of Salt River, below the mouth of Smoking Fork, there are salt flats, 

 and where the two branches of the latter stream unite above the cation 

 there are numerous salt springs. Here is where the old salt works were 

 located, at the point where the old Lander road crosses the creek. 



In the bluff east of this place red and gray sandstones are seen clip- 

 ping eastward. The reddish beds are below, and seem to be the ones 

 from which the salt is derived. Farther east an anticlinal fold was seen. 

 This region was not thoroughly explored, as time did not permit our 

 going through these hills. The evident structure, however, is a series 



