66 



YEARBOOK, PUBLIC MUSEUM, MILWAUKEE 



[Vol. II. 



tinct ice masses is known as a "cleaver," and many examples of such 

 rock forms can be found upon the slopes of this mountain. From the 

 point where these two branches coalesce to form the main Cowlitz 

 Glacier, a very prominent medial moraine is carried on the surface of 

 the ice. This is situated approximately in the center of the ice and 

 shows that the two tributary streams are of approximately equal 



Fig. 2)7. — The Cowlitz Rocks — a narrow ridge, or 

 "cleaver," separating the Cowlitz and Paradise Glaciers. 



strength. Both branches of the Cowlitz descend very steep slopes 

 immediately above their confluence, but the lower course of the glacier 

 is comparatively even and level. It is bordered by two lateral moraines 

 in the same way as is the Nisqually Glacier, and in its lower portion 

 these gradually grow wider and wider until they meet the medial mor- 

 aine in the center and beyond that point the entire surface of the ice- 



