36 SILYER-LEAD DEPOSITS OF EUREKA, NEVADA. 



has a northwesterly and southeasterly course. No rhyolite accompanies it, 

 but between it and the succeeding stratified limestone there is the ordinary 

 clay produced by attrition. The phenomena just described conclusively 

 prove the uplifting of this country in benches. 



The quartzite was most raised, sliding along its contact with the Pros- 

 pect Mountain limestone ; this limestone also being uplifted along the fissure 

 while the shale was raised along the fault between it and the stratified lime- 

 stone. During the upward motion of these different benches each rising 

 portion drew along with it more or less that which next succeeded. This is 

 visible in the present arrangement of the strata. In ascending it will be 

 observed that the main fissure, which faults or cuts off the shale, is no 

 longer in contact with this rock on the third level of the Jackson, Fig. 2, 

 Plate V. This is probably owing to the irregular form of the shale mass. 



The lower shale in the phoenix. — The next place where the shale is encountered is 

 on the sixth level of the Phoenix. It is laid bare by a northeastern cross- 

 cut 50 feet long 3<)0 feet northwest of the northeastern cross-cut from the 

 main incline. At the point where it is to be seen it is but 50 feet from the 

 main fissure, but as the drift does not pass through it it is not possible to 

 determine whether the same fault exists that is to be found on the north- 

 eastern side of the shale in the Jackson. It is altogether probable that it 

 does, however, and that this is the same body of shale that is exposed in 

 that mine, as its position is that which would be occupied by the Jackson 

 shale did it follow the course and dip which has been exposed in the cross- 

 cuts to the old Jackson shaft. Moreover it occurs on a line between the 

 next shale encountered in the Eureka and that found in the Jackson. The 

 Phoenix shale also does not appear on the surface. 



Lower shale in the k. k. — There is probably shale to be seen in the lower work- 

 ings of the K. K., but as everything in that mine has been flooded below 

 the sixth level for several years, it was not possible to examine the ground, 

 and information in regard to it was not reliable, as the clay in the main 

 fissure has often been described as shale. Still as shale is encountered in 

 the lower levels of the Eureka and Phoenix mines, it is likely that it is to be 

 found in those of the K. K. 



