A TYPE OF LAKE FORMATION IN CANADA 259 



and by implication a much more extended area, a certain kind 

 of drift ridge is more or less evident wherever a small valley 

 joins a larger one. 



2. These ridges are always found between the confluent 

 streams, are crossed by the lesser stream, and are nearly parallel 

 to the larger valley. 



3. They sweep out into the main valley or across the mouth 



Fig. 6. — Drawing to show probable flow of ice currents from Lake Louise valley. 



of the lesser one somewhat proportionally to the probable for- 

 mer dimensions of the glaciers occupying them. 



4. They are of unstratified drift, whose upper ends rest 

 against a rock buttress between the confluent valleys. 



5. They have a constant characteristic curve of outline, and 

 of horizontal projection, the latter corresponding to what would 

 be the lines of medial moraines on uniting glaciers from such 

 confluent valleys. 



6. They are not sharp crested, but are evidently a subglacial 



