of Edinburgh, Session 1882-83. 
211 
large pieces of it. These must have come from some site between 
the Kyle of Durness and Loch Carron. 
“ Again, another piece of rock is not to be distinguished from a 
mass of granular labradorite, which I found near the summit of one 
of the hills in Eum Island. 
“I have taken some trouble with these specimens, qualitatively 
analysing about four of them. Though somewhat differing in appear- 
ance, they are all coming out a finely crystalline, dense, pale yellow 
dolomite, approaching to marble, and so may have come from Assynt 
or the north of Ireland. 
‘‘It is most marked, the great number of pieces of this one kind 
of rock. I regard it as a ^find’ of importance; for surely now 
that it has been analysed, the rock can be found somewhere in 
situ.^’ 
In a memoir on the Orkneys by Messrs Horne and Peach {Quar- 
terly Journal of London Geological Society for Nov. 1880), it is 
mentioned, that in the island of Stronsa (not far from Eonaldshay) 
boulder clay on the eastern shore forms “ a continuous cliff for 
nearly half a mile.” “ The deposit, which varies from 20 to 30 feet 
in depth, consists of a tough gritty clay, of a reddish colour, full of 
well-smoothed and striated stones.” “The greater nnmber of in- 
cluded blocks have been derived from the flagstones and sandstone 
rocks of the neighbourhoods ; but the following rocks are likewise 
represented: — Granite, pinh 'porgiliyritic felstone, gneiss, schist, quartz- 
ite, white quartz, dark limestone, oolitic breccia, chalk, and chalk 
flmts, — all of which are foreign to the island.” (Page 657.) 
“ Equally important is the presence of numerous fragments of 
marine shells throughout the deposit.” “ Nearly all the fragments 
are smoothed and striated, like the stones in boulder clay; there 
can be little doubt that these characteristics are due to the very same 
cause in both cases.” (Page 657.) 
“ In the island of Shapinshay shelly boulder clay occurs at various 
localities, and contains finely striated chalk-stones.” (Page 657.) 
