108 
JOURNAL OF THE GEOLOGICAL SOCIETY OF DUBLIN. 
is cut through a thick bed of dark purple conglomerate; close to the 
northern entrance to the Gap these beds dip south, at from 60° to 70°, 
here the upper Old Red beds are observed, occupying but a small 
space, and beyond them, to the north, brownish purple grits set in, 
which Mr. Du Noyer thought should be included in the middle Old 
Red Sandstone; the upper Old Red is therefore probably contorted 
out of its proper line of strike, and, with the associated beds of the 
middle Old Red, inverted in dip, thus forming an S curve at this part 
of its boundary line. 
If we now make the ascent of the Reeks from the southern ex¬ 
tremity of the Gap of Dunloe, we pass up the southern face of Dris- 
hana Mountain. As usual in the low grounds of this district, we find 
greenish-gray grits, with green and purple slates and conglomeritic 
layers in the grits; and it is not till we reach an elevation of 1400 
feet or so, that we again come on the upper purple grits and slates, 
quite free from all green layers. The purple beds continue till we 
arrive at the most eastern summit of the Reeks, 2398 feet, and are 
persistent along the range dipping S. at 40°,—the crest of the 
mountain following accurately a series of regular contortions in the 
beds which twist them, from S. 40° to W. and N. W., and finally 
S. S. W., at the same angle. 
The Reeks having now reached the elevation of 3062 feet, the 
summit ridge having an average strike of E. N. E., suddenly turn 
sharp round, and strike S. for the distance of 1000 feet. Here a 
singular prospect opens on the view,—a bare rocky peak, still higher 
by probably 100 feet, rises directly to the south, perfectly precipi¬ 
tous on its eastern face, where the edges of the purple grits and slates 
are observed to be contorted along their line of strike; while, on its 
western side, the smooth bed-surfaces of the rocks, as they dip in 
that direction, slope downwards, and form the precipitous cliffs 
overhanging Lough Cummannapeasta, lying 1100 feet below. This 
peak of the Reeks is so rugged and steep as to be quite inaccessible. 
He here remarked, that the pinnacle at the head of the Hag’s Glen, 
N. E. base of Carrantwohill Mountain, called Stoompanaduff, the ter¬ 
mination of a rocky ridge, is equally inaccessible. The entire sum¬ 
mit ridge of the Reeks consists of purple grits and slates. 
At the head of the Hag’s Glen are the Lakes Gourach and Callee, 
the former being exactly half a mile east, in a direct horizontal line, 
from the summit of Carrantwohill Mountain, which is 3414 feet in 
