602 D. MILNE HOME ON THE PARALLEL ROADS OF LOCHABER. 
When the sea began to fall in level, so as to expose the land to the agencies 
of rain, snow, and frost, water would collect wherever there were depressions in 
the surface of the country, and form lakes. As the sea retired, the streams 
issuing from these lakes would acquire more power to cut out for themselves 
deeper channels where the materials were susceptible of erosion. 
3. In support of this view, that the whole of this part of Scotland was 
covered with detritus, the following list of places, with their heights above the 
sea, is submitted :— 
(1.) On the hills which surround Glen Gluoy, at a height of 1700 and 2000 
feet above the sea, beds of sand and gravel 10 and 12 feet thick at least, are 
conspicuous in every lateral ravine, and in many of these ravines, the beds of 
sand and gravel form cliffs or scaurs nearly a hundred feet deep. These beds 
of detritus abound on Letter Finlay Hill, situated between the Great Glen and 
Glen Gluoy. 




Portion of the wide valley of Alt-na-Bruach, showing some of the numerous Escars or 
Kaims occuring in it. These Kaims consist of gravel and sand, and reach heights of from 
30 to 50 feet above the adjoining plain. 
(2.) Near the summit of Craig Dhu, the hill between Glen Roy and Glen 
Spean, I found water-worn gravel at a height of 2000 feet above the sea. . 
(3.) On Ben Chlinaig, a hill on the south side of Glen Spean, and 
nearly opposite to Craig Dhu, at a height of 1700 feet above the sea, beds 
of boulder clay and gravel are cut through by all the streams flowing down 
its sides. The beds are rudely stratified, and slope towards the valley. 
(4.) In “ Alt-na-Bruach,”* there are extensive Scaurs or Kaims of gravel 
and sand, up to a height of more than 1200 feet. Through these deposits the 
* T am told that this Gaelic word means “ Valley of high heaps or banks.” 

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