550 KEPORT UNITED STATES GEOLOGICAL SURVEY. 



fold, as seen from a distance, appears complete, and tlie red sandstones 

 are the only beds on tlie mountain that are broken through. On the 

 east side the Carboniferous limestones appear to curve over uninter- 

 ruptedly, the curve being abrupt on the east side. As far as seen, no 

 Jurassic strata are involved in the folds of the range. The direction of 

 the fault fold just described is a few degrees east of south. The fold 

 continues southward beyond the head of Smith's Fork, where it will 

 be again considered farther on in this report. 



As we have already observed, the synclinal fold of Glacier Creek 

 continues southward, and its influence is seen in the course of Shoshone 

 Creek at its head. It flows northward along the western side of the 

 ridge, extending south from Station 56. South of Shoshone Creek the 

 depression is filled mainly with the red Triassic C?) sandstones. East 

 of Station 58 the depression is narrow and the eastern side very steep. 

 South the valley widens somewhat, but narrows again near Mount 

 Wagner, and probably disappears south of that point. The anticlinal 

 east of this depression was not crossed, but it is probably very sharp 

 and much eroded. Looking at the range from the Wyoming Eange, 

 a bluffy face is presented, back of which sharp peaks rise. These are 

 the summits that mark the anticlinal crest. The following general sec- 

 tion was made at Station 58, and corresponds with the figures in an 

 accompanying plate, the letters identifying the beds : 



Section No. 15. 



1. Massive limestone ^ 



2. Gray slialy sandstones and limestones. These are in all probability the [ 



beds that outcrop on Station 56, and contain the fossils given in the sec- [ 

 tion (No. 13) of those beds J 



3. Red sandstones and shales, probably Triassic ? ^ 



4. Same as No. 3, only reversed in dip 5 



5. Same as No. 2, reversed in dip c. 



6. Massive limestones. The portion nearest No. 5 being the same as those of 



layer No. 1. They stand almost on end in the centre, but dip westward 



as they are followed toward the station, showing an overturn d. 



7. Quartzites e. 



8. Massive blue limestones /. 



9. Yellow and gray shales and limestones g. 



The following section was made from a point west of Station 58 to the 

 valley of Salt Eiver. Beginning at the west, we have : 



Section JVb. 16. 



1. Limestones. 



2. Shales. 



3. Red sandstones. 



4. Quartzite. 



5. Blue limestone. 



6. Sandstones. 



7. Blue limestone. 



8. Sandstones. 



9. Red sandstones. 



10. Limestone shales. 



11. Blue limestones, in which a Productns was found. 



These beds all dip westward at high angles, and against them abut 

 beds of which the following is a general section, beginning at the top : 



Section JVo. 17. 



1. Blue limestone. 



2. Red sandstone. 



3. Blue limestone. ^ 



4. Greenish and gray limestone. 



