OF LOCHABER. 31 



the map), which surrounds the south side of the isolated rock, 

 and at a little distance below, it throws itself over a beautiful, 

 and very considerable waterfall. From this point, where the 

 valley widens for a little way, the river runs through a gravel- 

 ly alluvial, and being soon afterwards joined by the stream 

 from Glen Turret, it begins gradually to display rocks in its 

 bed, through which, as it advances, it continues to cut deeper 

 and deeper, till it approaches the flat ground near the Spean. 

 But although the immediate course of the stream be thus held 

 amongst rocks, yet large beds of alluvial matter, chiefly a red * 

 clay, with rounded pebbles and sand, are every where to be 

 met with, hanging, as it were, on the sides of the inclination 

 of the valley, between the shelves and the river. These beds 

 are stratified more or less regularlv, and fine sections of them 

 are afforded by the streams which cut through them in various 

 places, in their way to join the Roy, which, in its progress 

 down the valley, receives several tributary brooks. 



I have already traced Shelf Atk around the hill of Bohim- 

 tine, and into the mouth of Glen Roy. It is continued up 

 the N. W. side of the valley, and runs along the face of the 

 hill, perhaps above one hundred feet below the level of the 

 bottom of the Gap, (Plate III. fig. 2.). From this point it is 

 almost every where very distinctly marked in its course up- 

 wards, until it comes to the opening of Glen Turret, into 

 which it expands in a wide-extended inclined plane, above 

 half a mile in diameter, displaying a surface of peat-moss, 

 formed over a deep alluvial deposit of gravel and sand, and 

 presenting a high and abrupt bank to the stream of the Roy, 

 running in a line with the bottom of it. The level of the 

 shelf seems here just to touch upon the houses of Glen Tur- 

 ret, 



* Hence, probably, the name of Glen Roy, or the Red valley. 



