224 GEOLOGICAL SURVEY OF THE TEERITORIES. 



we i3ass over the upturned edges of the same sandstone now dipping in 

 the opposite direction. Just above it is an outcrop of dark-blue lime- 

 stone only a few feet in thickness. This is the same fold that we find in 

 section No. 11, at the point B iu Fig. 3, Plate VI. The axis has a 

 direction nearly north and south. The fold continues southward, and is 

 shown again in a low hill above the salt-works at the point in 

 Fig. 7, Plate VI. It is not so decided here, however, and seems to be 

 dying out. Fig. 7, Plate VI, represents a section running from the 

 west side of the park eastward to the volcanic butte on the west side of 

 Four Mile Creek. The following section is made on the bluff shown in 

 Fig. 7 at the point C. It is in ascending order on the line al) : 



Section No. 12. 



a. 1. The beds at the base of the bluff are entirely concealed for some 

 distance, and then we have — 



2. Red shaly sandstones breaking into very irregular pieces, 18 feet. 



3. Light red shaly sandstones in bands of varying structure. The 



general color is of a brick red ; some of the bands are very 

 soft, and in fine laminae, while others are vrery hard. The latter 

 are very dark, almost brown. The top of the bed is especially 

 shaly, and has lighter-colored bands, 68 feet. 



4. Eather coarse, grayish-white sandstone, 8 feet. 



5. Reddish and greenish-gray sandstone, with interlamiuated shales. 



Near the top there are very fi.ne red shales, 45 feet. 



6. Greenish-gray sandstone with bands of shale, 5 feet. 



7. Brownish-reel sandstone with interlaminated pink shales, 50 feet. 



8. Coarse, light-pink sandstone, 12 feet. 



9. Shaly sandstones, dark-red and very compact, at toj) lighter colored 



and more shaly below, 8 feet. 



10. Conglomerate sandstone with irregular pebbles of limestone, 38 feet. 



11. Coarse yellowish sandstone, 10 feet. 



12. Coarse irregular sandstone, 10 feet. 



13. Compact dark-red sandstone, with interlaminated shales, 125 feet.. 



14. Soft light-red shaly sandstone, 15 feet. 



15. Soft and rather fine gray sandstone shales, 15 feet. 



16. Gray sandstone, 10 feet. 



17. Brownish-red shales, 28 feet. 



18. Light-red shales, 77 feet. 



19. Coarse white sandstone. 



20. Eed shales 



This last bed crowns the bluff. The dip of the beds is from 15° to- 



20°. They are, without doubt, of the same age as the beds of sections 10 

 and 11, which I thought were Permean. Near the salt-works we have 

 three isolated buttes. The most southern, the one on the east of the 

 salt-works, is trachy tic, and is about 580 feet high. The rock is of a liver- 

 color, and jaspers are scattered over it in abundance. The base of the 

 butte is covered up, but from the occurrence of gypsum in considerable 

 quantity I take the rocks to be either of Cretaceous or Jurassic age. 

 There are, however, no well-defined outcrops. To the east of this butte 

 are two others, which Mr. Taggart determined to be volcanic, and of the 

 same character. One of these buttes has two cone-like projections. 

 The plain around them is covered with an alkaline efflorescence. This 

 is especially seen in the valley in which the salt-works are situated. 

 All the water in the streams in this region has an alkaline taste. At 

 the works are two springs and two wells that have been sunk by the 



I 42 feet. 



