DRIFT PHEXOMENA IN WISCONSIN 147 



outlet above the Lower Narrows down to the level of its bottom. 

 The location of this extinct lake is shown on the map, in Fig. i. 



Other extinct lakes. — The beds of at least two other extinct 

 ponds or small lakes above the level of the Baraboo are known. 

 These are at m and n, Fig. 2. They owe their origin to depres- 

 sions in the drift, but the outflowing waters have cut down their 

 outlets sufficiently to bring them to the condition of marshes. 

 Both were small in area and neither was deep. 



From the foregoing it is seen that the small area centering 

 about Devil's Lake presents a number of interesting drift phenom- 

 ena, some of which are possessed of unusual significance. This is 

 particularly true of the phenomena of the terminal moraine in its 

 passage over the quartzite ridge, and of the phenomena which 

 have led to the determination of the slope of the ice at its 

 extreme edge, along the south side of the quartzite range. 



RoLLiN D. Salisbury, 

 Wallace Walter Atwood. 



