DU NOTER— ON THE SOUTH OF IRELAND. 
247 
suppose that its origin is twofold : first, attributable to the sea-cur- 
rent, and then that of the river which flowed out of this glen, and of 
which it is the delta ; and secondly, of the glacier, which eventually 
blocked up this mountain gorge, when the land had been sufficiently 
elevated and the climate favourable for the formation of such pheno- 
mena. 
The innermost semicircular mound is, therefore, most probably 
the true moraine of the glacier; it measures 700 yards in length by 
about 150 yards in width ; its height above the sea in its central 
part where it is bisected by the Eiver Loe being 224 feet, and where 
it is escarped by the stream to the depth of 85 feet, without the rock 
being exposed. 
As the climate became less and less favourable for its formation, 
the glacier lessened in width and receded, and the rubbish brought 
down by it also decreased in amount, and it appears that the glacier 
ceased to be formed when its termination rested at a height of 800 
feet above the sea, as its debris is found at that height on the north- 
ern flank of Tomics E-ock. 
Throughout the entire extent of the Gap of Dunloe many of the 
rock-bosses along the precipitous flanks of Purple Mountain, and at 
the end of the Reeks on the western side of the gorge are rounded and 
striated, the striae being all parallel to the length of the Gap, or about 
N. and S. 
Over many rock-surfaces along the shores at the head of Glen- 
garifl" Bay, the glacial striae are well developed within a few yards 
of the sea-level. This is important, as it proves that the temperature 
of the sea and climate was Arctic after the country had assumed its 
present physical features. 
On the northern flanks of the Tralee range of mountains, which ter- 
minate in the summit of Caherconree, and at the mouths of the Glens 
of Bartugaum and Derrymore there are exceedingly well-marked small 
moraines, cut through by the streams which issue from these glens, 
and which escarp them to the depth of from 30 to 50 feet. 
Glacial striae are observed in both these gorges, and in manv 
places the Old Eed Sandstone rocks are polished, rounded, and fur- 
rowed in the direction of the length of the glens, or N. and S. 
The moraines are merely single semicircular mounds, measuring 
nearly half a mile from end to end, where they rest on the flank of 
the mountain, and having a width of fully a quarter of a mile. 
Over the rocky promontory in the county of Cork, formed by Dun- 
