178 
Proceedings of the Royal Society 
Notes by William Jolly, Esq., Inverness, on the Transportation 
of Rocks found on the South Shores of the Moray Firth. 
(Sent to Boulder Committee , October 1878.) 
Along the south shores of the inner portion of the Moray Firth, 
certain movements of rocks have taken place in geological times 
which are interesting as hearing on the inquiry into the general 
transportation of boulders over Scotland. These rocks are, happily, 
of very distinctive varieties, which renders the question of their 
source and movements a comparatively easy one. On these, I beg 
to offer some rapid notes, in connection with the work of the 
Boulder Committee. 
I. THE GRANITE OF THE DIRRIE MORE. 
At the back of Ben Wyvis, on the road to Ullapool, between the 
Ben and Strath Yaich, there exists a development of a peculiar 
granite in situ , easily seen in passing along the road. The granite 
occupies a considerable area in the centre of the valley, and is seen 
in great extent in the bed of the river, to which it imparts a wild 
and picturesque character, as the water dashes and foams amongst 
its projecting masses. The rock consists of the usual ingredients of 
trinary granite, but its distinctive feature is the existence of lenti- 
cular pieces of dark mica, arranged throughout its pinkish mass in 
pretty regular layers, which give the rock somewhat of the general 
aspect of a stratified deposit. It is peculiar in general appear- 
ance, and is easily distinguished wherever seen by its kenspeclcle 
character, even when not broken up. This rock is found scattered 
all over the country to the eastward of its parent position, and 
would seem to have been carried down the Blackwater valley in 
which it is found, and also right through the deep glen which exists 
in the very centre of the great bulk of Ben Wyvis, and which forms 
its most distinctive feature as seen from the Dirrie More, or Great 
Slope, as the long road to Ullapool is called. Thus viewed, Ben 
Wyvis seems cleft into two mighty masses by this great gorge, and 
has from this point, perhaps, its grandest and most commanding 
aspect. This granite is found scattered abundantly all over the 
Black Isle, where it exists as the most abundant surface rock, being 
imbedded in the debris and boulder clay that clothes the whole of 
