
D. MILNE HOME ON THE PARALLEL ROADS OF LOCHABER. 603 
burns have cut deep ravines, whose banks consist of cliffs or scaurs, at least 
400 feet high. Fig. 2 gives a representation of this A/t-na-Bruach Valley, as 
seen from the hill called Ben Chlinaig to the north. Fig 3. gives a section of 
one of the Escars. 
(5.) On the hill situated to the N.E. of the “Rough Burn,” situated on the 
east side of Glen Spean Valley, there are knolls of gravel at a height of 1700 
feet above the sea. These knolls are the remaining portions of extensive sheets 
of drift, which have been washed away by rains and streams. 
(6.) On the west side of Loch Laggan, I found abundance of coarse water- 
worn gravel upon the “ Bein-in hills,” as far up as I ascended, viz., 1890 feet 
above the sea. 
(7.) In Glen Collarig, there is in a lateral valley on the N.E. side, an enor- 
mous cliff of grey boulder clay. It is full of boulders and pebbles, and forms 
a vertical wall from 300 to 400 feet in height, above the highest shelf.* 
(8.) To the East of Loch Treig, at a height exceeding 1500 feet above the 
SSS 
E 2 
KZ4 
a S 

t ee ede ie 
“Eo iyo tnd Sd 






er 
Wa WE SS 
= Hata 
We 
Nis SQ 


































































































































































Fig. 3. 
Section of an Escar in Alt-na-Bruach Valley, cut through by a stream. No. 1 is a bed of 
’ stratified gravel, about 6 feet thick. No. 2 is stratified sand, about 20 feet thick, containing 
boulders. 
sea, a remarkable series of Kaims or Escars occur, consisting of detritus and 
Boulders. 
Tn corroboration of these observations regarding the enormous accumulation 
of detritus in these Lochaber valleys, it may be permitted to refer to the testi- 
mony of preceding inquirers. 7 
Maccuttocy, whose precision of description is well known (page 327) 
describes the hills forming Glen Roy as “ covered with a thick alluvium.” The 
nature of this alluvium he explains as consisting “of deposits of fine sand, 
eravel, clay, and rolled stones of different sizes, disposed in a manner irregu- 
larly stratified, and in a manner more or less horizontal,” (page 330). 
Darwin in his paper repeatedly alludes to the ‘‘ enormous accumulation of 
* To this cliff I particularly drew the attention of the Government Surveyors, and of Mr Jolly. 
VOL. XXVII. PART IV.. a8) 
