189 
Geological Relations of the East of Ireland* 
south of west, with a dip of 62° toward the south-east. Stilebawn 
in its northern part is mostly composed of quartz rock. 
§ 82. The range and dip of the stratified rocks in the Dargle, 
below Tinnahinch, have been already noticed, (§ 79). The com- 
pact beds vary generally in thickness from one to four feet, and the 
slaty from two to four and six inches. 
§ 83. Below the confluence of the Dargle and Glencullen streams, 
glossy greyish clay slate alone appears, ranging 15° south of east, 
and north of west, and dipping 45° toward the south. From the 
granite bridge downward to Bray, a deep deposition of alluvial 
matter occupies the high banks on the south, and the lower grounds 
on the north. 
§ 84. Bray Head appears to be composed of two great masses of 
quartz rock, the division being marked by a slight hollow in the 
middle part of the hill, which is occupied by the stratified rocks, 
ranging 30° south of east and north of west, and dipping 78° to- 
ward the north-east. But in following the rocky coast around the 
Head land, we find a numerous succession of stratified rocks. 
On the strand, at the northern end of the Head, they range 2 5° 
north of east and south of west, and dip 42° toward the north-west. 
Proceeding eastward, a west section is presented to our view, in 
which the beds actually undulate from south to north. Farther on, 
they range 15° south of east and north of west, and dip 65° to- 
ward the north-east ; but they are still inflected in the line of the 
dip, as they also evidently are in the line of the range, which may 
be observed in a good east section. Another eastern section is now 
presented, in which the rocks undulate from south to north, the 
range being still 15° south of east. Farther on, is a small inlet or 
cove, on the western side of which the rocks next the sea dip 45° 
toward the north-east, but more inland they begin to arch over to- 
