66 NEW TRACKS IN NORTH AMERICA. 
managed to twine around it, and by following in its bed we 
succeeded in doing so too. : 
From this point the walls on both sides are perpendicular. 
They are formed for the first few miles of conglomerate alone, 
which is horizontally stratified ; in fact, drift-washed down ~ 
by primeval waves from the mountain’s side. But as the ¥ 
feet per mile, brought us deeper into the earth, we reached 
the sandstones, and gradually passed through them to the 
hard granite beneath. 
Luxuriant vegetation fills up the space between the walle 
the undergrowth consists of willows, young trees, bunch i 
grass, reeds, &c., forming in many places an impenetrable” 
thicket; and ies them a succession of noble trees tower 
gradual fall of the stream bed, which is on an average 50 
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