730 /. H. OGILVIE 



medial moraines. Between the ridges the ice is comparatively clean 

 and has melted so that the debris stands up on ridges of ice. 



A remarkable feature of this glacier is the presence of several lakes 

 on the ice. Their basins apparently began as transverse crevasses, and 

 grew by melting. Their walls are vertical, and display the synchnal 

 structure of the ice, with the drift covering on the surface. There are 

 several lakes in various stages of growth, the process being that of 

 melting away beneath, the top being shaded by debris, and the result 

 being the production of a nearly round lake from a long narrow one. 

 The largest of these lakes measured about 500 feet by 300 feet 



Fig. 5. — Lake on the ice of the glacier in Consolation Valley, showing the synclinal 

 structure of the ice and the debris covering. 



Debris was constantly falling into this lake. The layers of ice could 

 be plainly seen (Fig. 4). The lamination was due mainly to differences 

 in consistency of the ice. The amount of interbedded material was 

 small, but was all concentrated along definite layers. 



The lower end of this glacier was more completely covered with 

 debris than the upper part, the streaks of different colors being 

 pushed close together. The glacier ends in a lake, a nearly perpen- 

 dicular cliff of ice rising from the water. Here also the layer of ice 

 miay be seen (Figs. 5 and 6). 



One recessional moraine is present, extending in a peninsula from 

 the shore of the lake into the water. On the shore the northern edge 

 of this moraine is bordered with bushes, and there are no other recent 

 moraines. It is therefore evident that this glacier is only a few feet 

 shorter than at the time oi its recent maximum extension. 



