Geology and Mineralogy. ae 
plateau, which has an elevation of a little over 3,000 feet above 
the sea-level. Suddenly, just before reaching Colfax, a sharp 
bend in the line, at a place called Cape Horn ened the road bed 
just on to the edge.o of the cafion of the North Fork of the Ameri- 
ean, down into and along which there is an ee rete view for 
eight o or ten miles, the bottom of the cafion being about 1,600 feet 
below the level of the road. The effect of the scene aye to 
e course of the old channels are pes partially Bony sc 
energy where it would cae nthe y olume gives a detailed account 
of observations on the gravel daposita and hit bed-rock made for 
ae ara maps of the areas of eee and d grave 
se of i ial interest we here one of the sections 
of the bac. or Tuolumne County, “Table coor aenenen from Plate 
mn Ty) A 
A 
A Alli ac _ a tl 
_ a a 
um . cn omnes a 
( 
eer Me “rim” of the old channel; and a tunnel (¢) is represented 
hrough this rim to the gold-bearing gravels, a common 
m erg of search, though attended with large expense and not 
always successful. 
