210 THE LOCH LOMOND AND OTHER VALLEYS. 



all the loose blocks and fragments, thereby clearing 

 out the basins. 



Loch Lomond occupies a remarkable valley, which 

 has a general bearing of north and south, correspond- 

 ing with the lie of other important breaks in that 

 part of Scotland. Extending from this valley east- 

 ward and westward are transverse features some 

 forming valleys, while others constitute greater or 

 less depressions in the hills. That all these valleys 

 and depressions are connected with dislocations in 

 the underlying strata is manifest by the strike of 

 the rocks being deflected, or the beds of rock rising 

 to the up-throw of the faults, or by the shifting of 

 conspicuous beds of rock. 



CLoch Lomond must, at no very remote period, have 

 been a fiord connected with the valley of the Clyde. 

 This is proved by the raised beaches of the latter 

 valley being on a similar elevation with the terraces 

 in the Loch Lomond valley, and the gravel-bar across 

 the latter, a little to the north of the lake. The lake- 

 basin, therefore, at that time, was a submerged valley, 

 which prior to its submergence, if the theory of the 

 subaerialists be correct, was excavated by rain and 

 rivers, or ice. 



The lake is divided into two portions by the chain 

 of islands stretching westward from Balmaha. From, 

 the chart * we learn that south of these islands it is 



1 Admiralty Chart, Scotland, Loch Lomond. 



