peale.] DESCRIPTIVE GEOLOGY SALT RIVER. 555 



of gentle folds in the gray and reddish sandstones and conglomerates 

 noted farther south. North of our district the beds occur also, and were 

 doubtfully referred to the Cretaceous by Mr. St. John. We did not find 

 any fossils in them, and cannot, therefore, refer them positively to that 

 age in our district. The salt works are situated on the North Branch a 

 mile or two above the junction of the streams. The company is termed 

 the Oneida Salt Works Company, operated by B. F. White, of Malade 

 City, Idaho. 



The following information was obtained from Mr. G-. W. Gordon, who 

 was in charge when we passed the works : There are several springs, 

 but only one was being used. !STo pumping is required, but the water 

 is run through wooden troughs into three vats. Two hundred thousand 

 pounds per month was the yield, at an expense of about $20 per day. 

 The force working was ten men, a portion being employed in cutting 

 wood in the adjacent hills. This force would be reduced to five men 

 after the wood was cut. At the works the salt was sold for 1^ cents per 

 pound. When delivered by the company the price, of course, is depend- 

 ent on the distance from the springs and the mode of sacking. The 

 principal market for the salt was Idaho and Montana, large quantities 

 being sent to the mining regions. The wagon road (Lander's cut-off) 

 passes the works and follows up the creek from which it crosses to the 

 head of the main Blackfoot. 



At the head of Smoking Creek we made two stations (Nos. 63 and 64). 



On Station 63 gray sandstones outcrop, dipping steeply to the east- 

 ward or northeastward, and a short distance south on the ridge they 

 dip steeply to the west. Above them are red sandstones, also dipping 

 west or southwest. On Station 64 the dip is west, so at Station 63 there 

 is evidently an overturn. Below the stations is a steep bluff, facing the 

 northeast. Beddish beds outcrop at the foot of the bluff, and there ap- 

 pear to be salt springs along its edge. Between the stations and the 

 wagon road are shaly limestones, dipping southwest. Above them are 

 coarse conglomeratic sandstones. These beds have the appearance of 

 Jurassic strata, but no fossils were found to prove it. Following down 

 the ridge from Station 64 the strike appears to curve to westward and 

 southward. On Station 67, which is between the Blackfoot and the 

 head of Smoking Creek, there is a dip to the northeast, so between Sta- 

 tions 63 and 64 and Station 67 there must be a synclinal. On the latter, 

 the beds, as seen from a distance, and from descriptions given by those 

 who were on the station, must be the Triassic red sandstones. There 

 has been some crushing and folding in this region, but we could not 

 spare the time to investigate it. Farther south on the ridge the dip in 

 the sandstones (at Station 62) is also toward the east, but the inclination 

 appears to be more gentle than it is to the northward. The range, there- 

 fore, is a monoclinal as we view it from the west, but toward the east 

 there is a broad synclinal. The strike of the beds appears to curve from 

 east of south to south and west of south as we follow the ridge south- 

 ward toward Crow Creek. 



These folds will be referred to again when describing the Blackfoot, 

 as they are developed between the branches of that stream which head 

 in the spurs of the Preuss Mountains. 



We have therefore seen that the country between the Salt Biver 

 Bange and the Blackfoot is filled with gently-folded rocks, forming com- 

 paratively low, rounded hills. The rocks, especially those west of Salt 

 Biver, seem to indicate deposition in rather shallow seas. A fault ap- 

 pears to extend along the western side of the Salt Biver Bange, while 

 the relations between the faulted beds and the Preuss Bange are not 



