90 I. C. RUSSELL — HANGING VALLEYS 



On the south side of Lundy canyon there is a high lateral trib utary 

 valley, known as Lake canyon, which is a typical glaciated hanging 

 valley. The floor of Lake canyon is about 1,000 feet above the bottom 

 of the receiving canyon and approximately on a level with the highest 

 evidence of glaciation on its sides. Bloody canyon has recesses in the 

 higher portions of its walls, but none of them can be considered as even 

 moderately well shaped hanging valleys. So far as these two canyons 

 are concerned the one which has undergone the lesser amount of glacial 

 alteration is the one which has the best defined hanging valley opening 

 into it. 



Throughout the Sierra Nevada and the Cascade range it is the long, 

 low-grade troughs similar to the lower half of Lundy canyon which 

 have the best defined and most typical hanging valleys opening into 

 them. It is in connection with these canyons, also, that there is a con- 

 spicuous absence of evidence, such as is furnished by moraines, of glacial 

 erosion. 



Conclusions 



If I have read the story correctly, it would seem that both the destruc- 

 tional and constructional topographic forms due to glaciers in the Pacific 

 Cordilleras of the United States seem to favor two conclusions : First, 

 that the mountains were deeply stream-sculptured before the Glacial 

 epoch, and, second, that certain of the glaciated hanging valleys are not 

 due, either wholly or in a large measure, to differential ice erosion. 



