SANDSTONE DIKES OF UTE PASS. 129 



general relations of the formations for both localities. It 

 will be observed that the flexing of the beds is entirely 

 normal — upward on the downthrow side of the fault and 

 downward on the upthrow side. From the top of the 

 curve the dike sandstone dips gently (5° to 10°) into the 

 hill. The outcrop, in part nearly horizontal, can be 

 followed right around the hill to the extreme south side. 

 The sandstone seems to become gradually thinner and 

 to die out finally in the bottom of the lateral gulch. The 

 upper contact is well exposed in a prospect hole and is 

 seen to be much broken by minor transverse faults, and 

 both sandstone and granite are much crushed and slicken- 

 sided along the contact. Below the main body of sand- 

 stone the granite is a complete network of sandstone 

 dikes from three inches to several feet wide running in 

 all directions. Apparently, the granite has overridden 

 the sandstone bed, and the unconsolidated portions were 

 forced down into the cracks in the granite below. Some 

 of the sandstone is quite coarse and gritt}', with many 

 feldspar grains ; and there are slickensided surfaces all 

 through it. In this hill and the preceding, the sandstone 

 is mainly brown. Gray sandstone is most characteristic 

 of vertical or highl}' inclined strata, probably because 

 that position is most favorable to the circulation of the 

 meteoric waters which have bleached the strata. The 

 stratification is in part as perfect as in any of the sand- 

 stones of the region — a fine and even lamination. This 

 dike is exposed again, with essentially the same char- 

 acters, on the east side of the creek ; but before gaining 

 the crest of the first main ridge it ends abruptly, appar- 

 ently cut ofi" by a transverse fault. 



Going up the west side of the valley, we find south of 

 the lateral gulch, first granite and then at least two hun- 

 dred feet of sandstone of the usual dike character. Its 



