BOUNDARY OF THE GLACIATED AREA. 



181 



of the adjacent fresh-water lakes have a general north-and- 

 south direction, parallel with the axis of the valley. This is 

 specially noticeable near Seattle, where Lake Washington, 



Fig. 59.— Typical section of till in Seattle. State of Washington, about two hundred feet 

 above the sound. This is on the height between tne sound and Lake Washington. 



elevated sixteen feet above tide, and twenty-five miles long, 

 is strictly parallel- with the sound, and is separated from it 



