222 



GEOLOGICAL SURVEY OF THE TERRITORIES. 



andstone ° I ^n f 



10. Space covered up | ^^^" 



11. Light-gray saudstoue. ^9 f^^f 



12. Eed sandstone ]^^ ^^^^• 



13. Blue limestone 10 feet. 



. 14 Eed sandstone shales 8 feet. 



15. Dark-gray argillaceous sandy shales, breaking into fine 



layers, between which are crystals of pseudo-malachite 10 feet. 



16. Eed sandstone shales 25 feet. 



17. Light-gray sandstone 8 feet. 



1). 18. Very dark blue, almost black, limestone 5 feet. 



These beds are, I think, a portion of those just below the red-beds 

 included in section No. 9, between beds 17 and 51. I am inclined to 

 refer them all to the Permian or Permo-Carboniferous. At any rate, if 

 not Permian, they are high up in the Carboniferous. I shall refer to 

 them again in a subsequent chapter, when I have occasion to speak of 

 similar rocks found on the Eagle Eiver, a branch of the Grand Eiver. 



Between the points A and B in Fig. 2, Plate VI, the Little Platte 

 makes a bend, as is seen on the map. The section in the illustration 

 crosses the stream twice, therefore, as shown at the points c and d. We 

 then ascend the hill B, which, from the exposures of bright-red sand- 

 stones where the river had cut through, is conspicuous from a long dis- 

 tance. It is from the summit of this hill westward that section ISo, 11 

 is made. 



Section No. 11. 



Made in descending order : 



\ 1. Eed sandstone shales outcropping on the summit 

 of the hill dipping south 50° west, at an angle 

 of about 30° 



2. Yery compact sandstones, generally of a mottled ') 

 character, in rather thin layers ; general color, 

 brick red 



3. Yery soft red sandstone, the first outcrop dipping 

 as No. 2. Proceeding a very short distance 

 we find that these sandstones form the center ! 

 of a small synclinal fold, the dip of the west- < 

 ern side being to the northeast, at an angle 

 of about 35° to 40°. We then have beds No. 

 2 and 1 the same as given above j below 

 which we have — 



e. to/. ^ 4. Bright red shales 3 



40 feet. 



5. Coarse pink sandstone 



6. Eed sandstones and shales 



7. White sandstone with greenish tinge 



8. Yery hard light-gray sandstones with bands of 



red shaly sandstone, varying from 4 inches to 

 3 feet 



9. Hard gray sandstone, very similar to No. 8, with 



bands of soft red shales. The gray sand- 

 stone is in bands from 6 inches to a foot .... 



10. Brick-red sandstones with pinkish layers 



11. Bands of hard gray sandstone with interlami- 



nated shales, very fine and dark red. The 

 lower band is about 2 feet thick, middle 6 

 inches, and top 1 foot 



10 feet. 



80 feet. 



3 feet. 



40 feet. 



20 feet. 

 31 feet. 



33 feet. 



