and on the Age of the Cascade Mountains. 171 
forming a perpendicular cliff on that side. The point first 
visited by us was nearly opposite the lower steamboat landing. 
The section here revealed is of the extremest interest. In figs. 
2 and 3 I give rude sketches of the face of the cliff (fig. 2) and 
2. 
ice me 
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a peo SET POC 7] 
of a section at right angles to the face (fig. 8). These sketches 
make no attempt at accuracy in form or proportion. They are 
RE? 
wide LE Per Bases zZ he ad ee 
found a very coarse conglomerate (a) of rounded porphyritie 
pebbles and ‘boulders of all sizes up to five or six feet in diam- 
img the boulder material, a, beneath, and therefore ev1 ue m 
stu. One of these is at least two feet in diameter, and its 
Spreading roots could be traced over an area of 20 feet diam- 
eter. The roots of the other and smaller one was traceable 
four or five feet. Besides these two, there were three other 
Vertical trunks in the éverbanging cliff, the roots of which I 
Suppose had been washed away by the river at high water. 
