196 
BATHYMETRICAL SURVEY OF 
by an examination of the depth map, that the deep water at the west 
end of the loch runs in the direction of this flat ground. Some deep 
borings along this flat ground might lead to interesting results. 
Loch Morar (as well as Loch Beoraid) is a glen-lake which lies in a 
transverse valley — that is to say, in a valley the direction of which 
is independent of the geological structure of the region and crosses 
FIG. 32. INDEX MAP OF THE MORAH, SHIEL, AILOET, AND NAN UAMH BASINS. 
irregularly the strike of the rocks. This fact very probably accounts 
for the steep sides and the great depth to which. the valley has been 
scooped out. Should the country be depressed about 40 feet. Loch 
Morar would be converted into a submerged valley and an arm of the 
sea like Loch Etive. By some observers it is held that the great depth 
of Loch Morar precludes the idea that it was scooped out by river- 
action or by ice. 
