PEA£j;.J 



GEOLOGY SECTION NO. 11, 



223 



14. 

 15, 

 16. 

 17. 



107 feet. 

 13 feet. 



9' < 



20. 

 21. 



23. 



^ 12. Coarse light-red sandstone 6 feet. 



13. Maroon-colored sandstone, shales streaked with 

 red. iTear the top there are lighter-colored 

 bands showing a gradual change toward 



No. 12 



White sandstone 



Maroon-colored shales , - . 400 feet. 



Pink sandstone with red bands 110 feet. 



Fine maroon-colored shales 220 feet. 



18. Light-maroon red sandstone shales 108 feet. 



19. Dark-maroon red sandstone shales, very fine- 

 grained 



Eeddish maroon -colored sandstone 



Gray micaceous sandstone with green spots, 

 very closely resembling those found in bed 

 15 of section i^o. 10. I think this is a higher 



bed, however 



Sandstones of a general greenish-gray color 

 extending for about a quarter of a mile. 

 These are probably a few beds of interlami- 

 nated limestone. The beds were too much 

 covered up, however, except to show that 



the sandstones are micaceous 



Dull reddish sandstone, rather light colored. 

 This bed is on the summit of the bluffs at C 



in the figure 



Fine black and gray shales 



Yellowish- white sandstone 



Brownish-red sandstone , 



Space reaching to the bottom of the hill, proba- 

 bly filled with sandstone, but so covered with 

 debris that the rocks are entirely concealed. 

 All the beds given in this section are probably above those of section 

 No. 11. They probably came up in the valley of the river between the 

 points A and B, where the river turns, their softness allowing them to 

 yield readily to the action of the water. 



My time was too limited to carry the section any farther either to the 

 eastward or to the west. In the latter direction the beds continue down 

 through the Carboniferous and Silurian. In following up the Little 

 Platte we find exposures of red sandstone shales resting on limestones. 

 I did not have time to make any section in the canon, but in a subse- 

 quent portion of the chapter will give a section made a little to the 

 north of the creek. To the eastward, about five miles down the stream, 

 I learn from the notes of Mr. Taggart, is a butte on the northeast side, 

 west of which are exposures of red -beds, as shown in Fig. 7, Plate VI, 

 at B. The dip here is 5'^ toward the northeast. Therefore, between 

 this point and the bend of the stream where section No. 10 was made, 

 is an anticlinal axis increasing from north to south, for there is no indi- 

 cation of it due east of Fair Play. This is probably the only fold, there 

 scarcely being room for more. The axis is about north and south. The 

 butte itself is volcanic, and the red-beds tipped up against a dip from 

 8^ to 10'=' to the westward, as shown in the illustration. Crossing 

 Four Mile Creek the dip is again east or northeast. Eeturning to the 

 road, which keeps close to the low hills, a short distance below the point 

 where sections Nos. 10 and 11 were made, is an outcrop of gray sand- 

 stone, dipping a few degrees north of west. Still farther down the road 



i. 



24. 



i. 



25. 



li. 



26. 



I. 



27. 



108 feet. 

 20 feet. 



15 feet. 



660 feel 



16 feet. 

 22 feet. 

 15 feet. 

 26 feet. 



38 feet. 



