Earl Compton on the Rocks of the Isle of Mull . 371 
indeed much sharper and finer, I think, than they are in general 
at StafFa. 
On the shore appears a small whin dyke, a few inches thick, and 
running in a direction about north-west and south-east. A little 
farther, is a very curious insulated rock, standing on the sea shore, 
about one hundred yards from the main rocks of the coast. It is 
of a very singular form, and basaltic, with very distinct columns, 
some of which are nearly horizontal. It is a curious circumstance 
that no columns are visible in that part of the precipice directly 
opposite to this rock. The name of this rock is Uamh Doun, and 
it is about seventy-two feet in height, as I have been informed. 
I was unable to proceed further to the east, but I understand that 
the interest of the coast in that direction is far from being exhausted. 
Between the house and Carseg, and the three whin dykes, there 
are, under high water mark, rocks on the shore of a very dark 
colour, and micaceous texture, containing cornua ammonis. As 
my path lay considerably higher, and as my time was fully occupied, 
I was unable to visit them. Except these micaceous rocks, and the 
small quarry of free-stone already mentioned, I am not aware of 
any rocks, not basaltic, between Carseg farm house and Uamh 
Doun. The basaltic rocks to the eastward of Carseg, being more 
compact than those to the westward, have fewer cavities and 
imbedded minerals. 
Proceeding now to the west of Carseg, at about a quarter of a 
mile from the house, and on the sea shore, is seen a small whin 
dyke, about eight inches thick, rising but a few inches from the 
ground, and running in a direction about north-east and south-west. 
The range of rocks is much higher to the westward of the farm, 
than to the eastward, the former varying in general from perhaps 
about two hundred feet, to five hundred in height ; the latter are 
