Geological Relations of the East of Ireland. 261 
north-eastern inclination one of those great swells or undulations, 
which are so common in rocks of this class. Again, a little to the 
south, on the northern side of a small cove or inlet, which is about 
forty yards across, they resume the south-eastern inclination, but 
acquire the higher elevation of 40° ; and on the other side of the 
cove, the strata rise up to the southward, under an angle of 60°, ^o 
that a complete trough or basin is formed. 
A little farther south, we are presented with an horizontal sec- 
tion, in which the curvature of the strata appears continuous in 
every direction ; whence it would seem that they originally con- 
stituted an elliptical assemblage of concentric layers, analogous to 
what we have observed in the primary stratified rocks of Howth ; 
(§ 86.) And such assemblages are probably not uncommon in the 
inflected strata of limestone. 
From hence to the northern side of a small inlet, which is situ- 
ated immediately on the north of Loughshinny bay, the limestone 
strata present a pretty uniform dip of 45° toward the south : and at 
this northern point, an horizontal section of an interesting character 
is displayed. A vein of breccia, seemingly vertical, traverses the 
beds of limestone and slate clay in a north-west and south-east 
direction, but without apparently displacing them. It is exposed 
for about thirty fathoms in length, but its termination is concealed 
by the sea toward the south-east, and by the soil and grass land of 
the bank on the north-west. This vein is very remarkable in its 
form, swelling out into bellies, about four feet across in the widest 
part, and contracting again ; and consisting entirely of angular frag- 
ments of limestone and slate clay, of various sizes, embodied in, and 
cemented by white calcareous spar; (see Plate 13. fig. 11.) 
To the south of this inlet, some of the limestone strata are most 
curiously interwoven with contemporaneous veins and strings of 
