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JOURNAL OF THE GEOLOGICAL SOCIETY OF DUBLIN. 
long, of one bed of coarse red conglomerate, visible over the gravel on 
the shore. It rests on the Pier, which is greenstone, with veins of 
calcareous spar. Immediately south of this a black shale occurs, 
with rounded masses of gray limestone, and in one of those nodules 
the Orthis reversa was got, which Mr. Salter described and figured 
for Mr. Griffith’s Synopsis of the Silurian fossils. Greenstone, as here, 
often makes its appearance in the boundary between the Silurian 
and Carboniferous systems. 
38. At Grangeclare the Old Red Sandstone is but a small patch 
lying on the south flank of the Dunmurry range of clay slate hills, 
which are probably Silurian, from the proximity of the Chair of 
Kildare, a hill of light gray limestone, with some associated black 
and red slate, abounding in Silurian fossils. 
43. At Cornagha, near Boyle, and along the south flank of the 
Curlew Mountains, the brownstone dips north, at a low angle, about 
10°. At Ballinphuil the yellow part of the Old Red Sandstone is 
visible, and dips S. 7°. These two observations are farther asunder 
than I would be inclined to adopt, were it not that both rocks are 
remarkably steady and regular in the dip for a good space around; 
as at No. 22, both rocks being sandstone, this difference of dip 
might be considered a slight anticlinal axis in the one system; but 
the arm to the north is a hard brown quartzose grit, remarkably 
uniform in physical appearance, and the beds accumulate to a large 
amount, while that to the south is a soft whitish sandstone, at Ter- 
mon immediately surmounted by limestone, showing that the two 
sides of the axis belong to two different systems. 
45. At Derrylaura, near Oughterard, the underlying rock is gra¬ 
nite, which here shows itself between the Old Red Sandstone and a 
Silurian dark gray slaty grit, very fossiliferous. 
46. At Cregganore, near Loughrea, the base of the Old Red Sand¬ 
stone is seen in one of the clearest junctions in Ireland. Here are 
several patches of the lowest bed of the conglomerate, seen lying hori¬ 
zontally on the black slate, which dips at a steep angle. The calca¬ 
reous slate, which lies over it, is visible also in a stream a little below 
on the side of the hill, thus showing the whole thickness of the 
sandstone, which here is unusually small. This locality is known for 
miles around by the name of Toberelathan, or St. Elathan’s Well. 
62. At Kinard, near Dingle, on the hill, level beds of soft Red 
Sandstone lie on the edges of vertical beds of brown hard grit, in 
