CAEICO AND EAILROAD PEAKS. 625 



of, pure white quartzite taken from near the summit of Carico Peak shows 

 that it is made up largely of silica. It yielded : 



Silica ...-• 97.60 



Water 0.28 



97.88 



The other ingredients were alumina and iron. As to the geological 



horizon of these quartzites but little definite evidence was obtained, as they 



are either surrounded by volcanic material or Quaternary deposits, with no 



exposure of either an overlying or underlying limestone. It seems highly 



probable, however, that they belong to the same great series of quartzites 



that characterize the Shoshone and Toyabe Ranges, and have been referred 



to the Weber Quartzite. 

 40 D G 



