160 ' GEOLOGY OF THE EUKEKA DISTlilCT. 



iug much tlie same lithological habit throughovit and everywhere lying 

 inchned toward the west at high angles. 



At Bold Bluff, where the quartzite gives out, the Newark fault brings 

 the lower members of the limestone next the White Pine shale. Along the 

 west side of Hayes Canyon both formations dip into the ridge, but it is 

 somewhat difficult to recognize the unconformity along the contact, owing 

 to the amount of debris, in spite of the fact that the angle of dip between 

 the two horizons varies from 20° to 30°. Several observations, taken at 

 different points along the canyon wall, gave about 25° as the angle of 

 unconformity. The evidence of the unconformity is strengthened b}' the 

 absence of the entire thickness of quartzite, the true position of which, 

 between the limestone and shale, is so well exhibited both on the east side 

 of Diamond Peak and in the neighborhood of Bold Bluff and Water 

 Canyon. Again, the wedging out of the White Pine shale, which is 

 completely lost at the mouth of Hayes Canyon, gives additional evidence of 

 the unconformity. 



The upper members of the Lower Coal-measures are quite as sharply 

 defined on the west side by the Alpha fault, which for a short distance 

 follows along the steep northwest slope of Diamond Peak, bringing the 

 Upper Coal-measures unconformably against the quartzite. Nearly due west 

 of the summit the fault trends off to the southwest and the Lower Coal- 

 measures come in next the quartzite, the line of fault marking the contact 

 between the two bodies of Carboniferous limestone. The Alpha fault con- 

 tinues southward along the base of Alpha Peak, but terminates abruptly 

 on reaching the north slope of Weber Peak. It is rarely that an uncon- 

 formity in Carboniferous limestone strata is more strikingly shown than b}' 

 the two Coal-measure formations along the Alpha fault. There may be 

 seen here on one side of the fault, the underlying limestones dipping west- 

 ward at angles varying from 65° to 85°, and on the opposite side, the over- 

 lying limestones inclined at angles rarely exceeding 10°. 



At Weber Peak, where the Alpha fault terminates, an east and west 

 fault brings up the Weber conglomerate, and from here southward the beds 

 of the latter epoch are found in their true geological position conformably 

 overlying the Lower Coal-measures. This east and west fault does not 



