1900-1901. | A Geological Trip. 165 
VI—A GEOLOGICAL TRIP TO AULTNACALLAGACH 
AND INCHNADAMFF. 
By Mr T. CUTHBERT DAY. 
(Read Feb. 6, 1901.) 
Far away in the north-west of Scotland we have exposed to 
view some of the very oldest rocks, geologically speaking, that 
are to be found in the world. In addition to this, great dis- 
location and overthrusting of the strata have taken place in 
this district, which has had the effect of complicating in a very 
great degree the geological study of the rocks. The tract of 
country to which I allude stretches in a narrow strip from a 
little to the east of Cape Wrath—namely, Whitten Head on 
Loch Erriboll—to the island of Skye. It was known for a long 
time as the “Secret of the Highlands,’ and for many years 
baffled the ingenuity of geologists, though you may be sure 
many and arduous attempts were made to solve the problem. 
Within comparatively recent years the puzzle has been in a 
great measure cleared up, and the country carefully mapped. 
It was only by persistent study, sheer hard work, untiring in- 
dustry, and careful attention to minute detail that this was 
accomplished. The names of those who took part in this great 
work are well known, and it is unnecessary for me to attempt 
to assign individual merit where all have shone conspicuously. 
They have made for themselves a monument more enduring 
than brass. 
It was the desire to study this interesting district that took 
me northwards in the summer of 1895 to spend a nine days’ 
holiday, all too short for the purpose, in going over a portion 
of the country now so well mapped out, and especially that 
part which has been affected by earth movements. Fig. 1 is 
a sketch-map of the part visited. To get there, the usual 
course is to take train by the Highland Railway vid Inver- 
ness to Lairg, and there to take a place in the mail-cart, which 
goes daily from that place to Lochinver on the west coast. 
The distance from Lairg to Aultnacallagach is about twenty- 
five miles. In the first part of the drive the country is fairly 
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