270 Proceedings of the Royal Society of Edinburgh. [Sess. 
with the stone, and is of the nature of a boulder clay. The faceting of 
many of the striated stones shows that they were in all probability embedded 
in a moraine profonde sufficiently tenaceous to hold them in place while the 
ice passed over them and cut facets upon them (PL IY.). 
The presence of the globigerina ooze indicates that at the period of the 
distribution of the stones there was a surface warm-water current from the 
west, and that at Station 95 the water could not have heen shallow but 
probably much the same depth as at present, showing that the continental 
shelf had already been drowned. 
The observations of Messrs Wright and Muff* * * § prove that in the Cork 
district of Ireland there is a rock -notch and beach not far above present 
sea-level which are covered up by the till left by the combined Scottish 
and Irish ice during the period of maximum glaciation. This notch has 
also been recognised in Wales by Dr Jehu,f and in the Western Islands of 
Scotland by Mr Wright, J indicating that in these regions the relative level 
of land and sea is much the same now as it was at the beginning of the 
Glacial Period. 
The absence at Station 95 of gabbro fragments like those dredged in 
great profusion from the “ Porcupine Bank,” § which is evidently the worn- 
down stump of a great Tertiary volcanic centre comparable with that of 
Mull, Skye, or St Kilda, also goes to indicate that the bank was 
“drowned” and out of reach even of ice at the period of distribution of 
our material. 
The conclusion arrived at regarding the stones from Station 95 may 
appear to be at variance with that set forth by Messrs Cole and Crooke in 
their memoir on “ Rock Specimens dredged from the Floor of the Atlantic 
off the Coast of Ireland,” || who infer that the material examined by them 
is mainly the debris of rocks in place on the sea- floor. The difference, 
however, is more apparent than real. A great deal of their material comes 
from what is part of the “continental shelf” or its immediate margin. 
They may therefore be dealing in part with an old land surface and the 
delta of rivers that flowed across it, which had been pushed forward on to 
the “ Atlantic Rise,” the Porcupine Bank being at the time a volcanic pile 
rising out of the deep water as an island in process of being cut down to 
* W. B. Wright and H. B. Muff, “The Pre-glacial Raised Beach of the South Coast of 
Ireland,” Scient. Proc. Boy. Dublin Soc ., N.S., vol. x. p. 250, 1904. 
t Jehu, Trans. Boy. Soc. Edin., vol. xlvii. (1909), p. 27. 
I W. B. Wright, Geol. Mag., Dec. V., vol. viii. (1910), pp. 98-109. 
§ A. J. Grenville Cole and T. Crooke, “ On Rock Specimens dredged from the Floor of the 
Atlantic off the Coast of Ireland,” Mem. Geol. Survey of Ireland (1910), pp. 4-10, and map. 
j| Op. cit., pp. 26-27, and map. 
