ON THE SHELL-BEARING DEPOSITS IN KINTYRE. 389 
occurrence of granite boulders derived from the mass in the north of Arran. 
They are met with in the boulder-clay and on the surface of the ground 
throughout the peninsula from the Mull of Kintyre to a point several 
miles north of Carradale Bay. Mr. Symes has noted many examples in 
the course of his survey of the region, and the members of the Committee 
who visited Kintyre likewise recorded several instances. The determina- 
tion of the northern limit of Arran granite boulders is a point of con- 
siderable interest in relation to the extent of the deflection of the ice 
across the peninsula. With the view of obtaining evidence on this question 
the Secretary of the Committee paid a special visit to Carradale Bay and 
traced the boulders northwards to Grogport, on the east coast. Mr. B. N. 
Peach, F.R.S., has noted erratics of quartz-felsite, resembling the quartz- 
felsite or trachyte of Drumadoon in Arran. 
Reference may also be made to the fact that along the west coast 
between Cleongart and Tangy Glen, where a narrow belt of Upper Old 
Red Sandstone, resting unconformably on the crystalline schists, fringes 
the coast, no fragments of red sandstone derived from this patch have 
been observed in the boulder-clay to the east, while blocks of the local 
crystalline schists have been carried westwards on to the area occupied by 
the Upper Old Red Sandstone. 
VI. Report by Dr. Davin Rosertson, /.G.S., ELS, 
Mem. Imp. Roy. Zool. Botan. Soc., Vienna. 
In the preparation of the clays for taking the percentage of mud, sand, 
and gravel of the different deposits, the term ‘mud’ is that which passes 
through a sieve of ninety-six meshes to the inch ; ‘sand’ is that which 
passes through a sieve of twenty-four meshes to the inch ; ‘ gravel’ is that 
which is retained in the same sieve of twenty-four meshes to the inch ; 
and ‘floats’ is that which is gathered on the surface of the water when 
the dry clay is put in and stirred up. 
T have all the materials parcelled separately, except the muds, which 
passed away in the washing. I have samples of the sand in small bottles, 
so that each sample can be compared with the others. The stones and 
gravels are parcelled up for the same purpose. 
The gravels are mostly water-worn ; some are angular, the proportions 
differing more or less in different samples. No striations were noticed on 
the stones, large or small, with the exception of one stone sent me by 
Mr. Gray, 2 lb. weight, which is well striated on the line of the longest 
axis on the under side, and obliquely on the upper. It seems possible, 
however, that this stone may have got into the shelly clay from the 
adjoining boulder-clay above. 
On our visit to the Cleongart deposit, no whole shells with their valves 
together could be seen, except one or two of the very smallest. This 
may be very well accounted for. Our friend, Mr. Gray, the discoverer 
of this shelly deposit some years ago, had made several visits to the place, 
and had gathered nearly all the shells worth taking that weathering had 
exposed, probably for a long time past. These are now to be seen in 
the Campbelton Museum. Although fragments of shells are still found 
thickly strewn over the bank, they are but sparsely met with in the dark 
blue clay underneath. This also may be explained by the action of 
weathering. 
