Glacial PJienomoia m WasJmigton. — Dazvso)i. 213 
at the top. The bottom of this rent, which is a mile in length, 
is occupied at present by glacial debris. 
(3). To this third type also belong many small coulees 
which parallel for short distances the main valleys of the 
county. These are generally deep and narrow gorges which 
the ice has hollowed out between some sturdy outlying spur 
and its parent mountain. At least seven such well marked 
miniature coulees are to be found within a radius of four miles 
from Chelan. 
Bearing no less emphatic testimony to the occupation by 
the ice, the terraces of Okanogan county deserve particular no- 
tice. I only regret that my observations with reference to these 
were not more accurate, and especially that a table of levels 
was not prepared. Mr. I. C. Russell has offered some com- 
ments upon the appearance of the terraces about Chelan, but 
I must confess that I cannot agree with some of his conclu- 
sions, and especially those relative to a lake Lewis. It might 
be that a careful re-examination of the facts would demon- 
strate the grounds for his supposition, but inasmuch as his 
pamphlet did not come into my hands until since my return, 
I must beg leave to explain the facts in another way, and to 
call attention in place to a few discrepancies in Mr. Russell's 
notes. 
The subject may be divided into river terraces and lake 
terraces. To the former we have already alluded in the topo- 
graphical sketch. In speaking of these features, Mr. Russell 
first describes a "great terrace" as noted in the Columbia 
valley a little below the mouth of the Chelan river, "the sur- 
face of which is 700 feet above the Columbia." Afterward he 
alludes to this "great terrace" repeatedly as appearing in his 
progress up the stream. Now this great terrace can be none 
other than the 300 foot terrace, which has notable expansions in 
the Howard or "poverty" flat, above the mouth of the Chelan 
river; in Paslay's bench above the mouth of the Methow; and 
in the Okanogan flats, with which also the great terrace of the 
Okanogan river is substantially continuous. Either Mr. Rus- 
sell is mistaken in his estimate of the hight of the true, great 
terrace, or else at fault in trying to correlate his 700 foot ter- 
race with the "great terrace." This point is important, for 
Mr. Russell on this mistaken supposition proceeds to correlate 
