SANDSTONE DIKES OF UTE PASS. 127 



which is probably not more than ten to fifteen feet thick 

 and seems to retain its strong southwest hade. 



The south dike does not seem to cross the next spur, 

 but across its steep north end is some float that may be 

 referred to the great north dike ; and on passing around 

 to the northeast corner of this spur, where it slopes down 

 to the next little gulch, there is a great development 

 of sandstone. It meets the sfranite alons^ a northeast-south- 

 west line and quite certainly extends under the granite 

 at a low angle. In part the sandstone is quite distinctly 

 stratified, in beds one to two feet thick, and these are 

 sometimes minutely laminated. On the south side of 

 the outcrop and near the granite, the dip is toward the 

 granite, indicating that the sandstone underlies the gran- 

 ite ; but toward the north side of the dike the beds dip 

 slightly in that direction. In all cases the dip is low — 

 5° to 15°. Apparently we have here the original stratifica- 

 tion of the sandstone. The granite has been thrust 

 -obliquely over it, crushing nid disturbing the (then) halt 

 consolidated sandstone, but not wholly obliterating its 

 bedding. The sandstone is traversed in all directions, 

 but especially parallel to the bedding planes, by highly 

 perfect slickensides. 



In the bottom of the gulch, below the dike sandstone, 

 the Fountain beds are seen tilted 90° or more. Farther 

 down, both in this gulch and the next one, the Fountain 

 beds quickly subside to a northerly dip of 10° to 15°. 

 Tlie great fault evidently hades southwest at a very low 

 angle, so far as the southwest wall of the dike is con- 

 cerned, but in the bottom of the gulch the dike sand- 

 stone, where it comes nearest to the Fountain beds 

 (the nearest outcrops being thirty to forty feet distant), 

 is inclined at the same angle (S. W. 85°). The stratifica- 

 tion is very distinct, and the sandstone beds are evidently 



