02 BATHYMETRICAL SURVEY OF 



the direction of the striae is E. 20 S., which coincides generally with the 

 long axis of the loch. Reference has already been made to the more 

 easterly movement of the ice as it left the mountainous region and 

 approached the low-lying districts; the course of Loch Ard coincides 

 with this easterly trend of the ice. 



From the evidence adduced it is obvious that the geological structure 

 of the basin of Loch Ard has had an important influence in the develop- 

 ment of its present features, the latter being adequately explained by 

 the theory of glacial erosion. 



The Lake of Menteith lies in various superficial deposits, composed 

 partly of boulder-clay and stratified beds of the 100-feet beach. It is 

 within the area occupied by the Old Red Sandstone, and the solid rock 

 is visible only at one locality, at Coilledon. Loch Leven likewise lies in 

 superficial deposits. 



