THE 
AMERICAN GEOLOGIST. 
Vol. XXII. OCTOBER, 1898. No. 4 
GLACIAL PHENOMENA IN OKANOGAN 
COUNTY, WASHINGTON. 
By William L. Dawson. 
In taking up the study of this great mountain county, it 
seems necessary to state that no systematic work, apart from 
that incident to mining operations, has ever been carried on 
here except that done last year, the results of which are not 
published yet. Hence this paper can only record scattering 
observations and a few inferences drawn from them in this 
large and little explored field. Mr. Bailey Willis in 1887 
took a hasty survey of the facts in the northern part of the 
county and along the Columbia river, publishing them briefly 
in his "Changes in River Courses in Washington Territory 
Due to Glaciation." (Bull. No. 40, U. S. Geol. Surv.) Israel 
Cook Russell, in the employ of the United States geological 
survey, visited the region about Chelan during the summer 
of '92, and makes some notes in Bulletin No. 108 (U. S. Geol. 
Surv.), entitled "A Geological Reconnoisance in Central 
Washington." It is to him that I am indebted for many of 
the facts in northern Douglas county, which need to be re- 
ferred to in order to make our present subject intelligible. It 
was the writer's privilege to spend some fourteen months in 
Okanogan county, from June, 1895, to August. 1896. With 
headquarters at Chelan, tours were made through all the prin- 
cipal valleys, and three or four expeditions were made in ad- 
dition to the high mountains about the head of lake Chelan. 
The Indian reservation, embracing all the land east of the 
Okanogan river, was not visited. 
