382 



W. A. Johnston^— Sedimentation in 



Bottom Sample No. 1 



Lake Louise, Alta. 



Depth 5 Fath. 



Fig. 1. 



Bottom Sample No. 2 



Lake Louise, Alta. 



Depth 35 Fath. 



Section of 



banded silt and clay 



Ottawa, Ont. 



J ; i# 





Fig. 1. — Core samples (Nos. 1 and 2) of sediments being formed in Lake 

 Louise, Alberta, Canada, and a section of banded silt and clay from Ottawa, 

 Canada. The samples are mounted in plaster of paris and have been sec- 

 tioned vertically to show the character of the stratification. 



