12 
PROCEEDINGS OF SOCIETIES. 
mountable difficulty, and that is, that we actually find the Glengarriff 
grits graduating conformably upwards, not only into the Old Eed Sand¬ 
stone, all the convolutions of which they follow (this latter being iden¬ 
tical with the Old Red of Dingle, as well as with that of Waterford, 
Cork, and Kilkenny); but also, as a matter of course, conforming to the 
plant beds of the Yellow Sandstone, such as those of the Coomhola or the 
Roughty Rivers, as well as to the Carboniferous Slate, the Lower and Upper 
Limestone and the Coal. So that, south of Dingle Bay, we have the Glen¬ 
garriff grits conforming to the Old Red Sandstone and the Carbonife¬ 
rous series; while north of the bay we have them conforming to the 
Silurian rocks, and at the same time underlying the Old Red Sandstone 
and Carboniferous strata unconformably. 
The Old Red Sandstone of the promontory south of Dingle Bay ex¬ 
tends east and west from the Lakes of Killarney, north of Mac Gilli- 
cuddy’s Reeks, by Lough Caragh, and north of Cahirciveen to Doulus 
Head on the west coast; a small outlier occurring from the west of 
Carrantuohill, to the east of Cummeennapeasta, which forms the sum¬ 
mit of the reeks ; and again on the south, it occupies the valley of Ken- 
mare, on both sides of Kenmare Bay, as may be seen from the section 
which I have prepared across the Dingle district to the valley of Ken¬ 
mare ; and it may be said to surround the Glengarriff grits on every side: 
these rocks again occurring between the Old Red of the south shore of 
Kenmare Bay, and that of the north shore of Bantry Bay. 
The grits which derive their name from the latter district, where 
they occur in a typical form in the neighbourhood of Glengarriff, being 
distinguished on my Geological Map by a special letter and colour, con¬ 
sist of greenish and brownish sandstones and conglomerates, alternating 
with reddish-brown, purple, green, and reddish-gray slates, identical in 
character with the Glengarriff grits of the Dingle promontory; and they 
maybe seen conforming in innumerable convolutions (though not present¬ 
ing so much vertical disturbance as those of Dingle), to the Old Red Sand¬ 
stone at Mac Gillicuddy’s Reeks, also near Lough Caragh; and thence 
extending to the east of it, through the Gap of Dunlo, towards Mu cross 
Lake and Tore Mountain. Again, on both sides of the valley of Ken¬ 
mare, and southward by the Priests’ Leap, to the Old Red Sandstone 
north of the Coomhola River, in all which cases, there is an almost in¬ 
sensible gradation of the one rock into the other, with nothing to mark 
the passage beyond the colour of the two series of rocks, and the predo¬ 
minance of reddish-gray sandstone strata towards the top of the under¬ 
lying grit series. 
In endeavouring to render these inharmonious facts as consistent as 
possible, and to form some sort of definite idea respecting them, I 
brought to my aid the speculation, which though perhaps not sufficiently 
satisfactory, I may still offer for as much as it is worth : namely, that 
we had in the Glengarriff rocks, south of Dingle Bay, a set of strata still 
higher in the series than those of Dingle, and that, in consequence, as 
we passed southward, the sequence of the grit strata became more com¬ 
plete. I must, however, confess that it appears to me, at present, that 
