277 



7. Ballysillan is two miles north of No. 6. The chalk, in a range of 

 quarries along the southern face of this mountain, stands at about 730 

 feet high. This is the highest part of the outcrop in the line of country 

 between Moira and Glenarm. 



Fig. 2. 



Whin Dykes in Chalk at Ballymoney. 



8. Cave Hill is three miles north-east of No. 7. Limestone is quarried 

 extensively here, for the use of the country westwards. It dips west 10°, 

 and measures 93 feet thick. The mulatto is under it here, but there is 

 no means of knowing how thick. All the face of the hill, for a mile to 

 the south of the quarry, is covered over with hillocks which have 

 slipped down from their natural position, owing to the stratum of lias 

 clay which lies beneath, and which grows quite soft, and yields, when 

 it gets wet, by water percolating through the ground after heavy rains. 

 The top of Squire's Hill, and of Cave Hill, near Belfast, are both com- 

 posed of gray stone. 



Carntallis four miles north of No. 8. The chalk is 280 feet lower 

 than that at Ballysillan, No. 7. This is the low pass, over which the 

 railway from Belfast is laid to the western parts of the county. There is 

 no certainty as to the .true position of the chalk hereabouts. The face 

 of the steep ground has many slips. The whole surface of the slope is 

 covered with debris, and the thickness of chalk or greensand cannot be 

 measured, and only a rough guess made at it, too rough to be recorded. 



Here I may note that a patch of chalk occurs at Templepatrick, 

 towards the middle of the trap country, between Belfast and Antrim. 

 It is about a mile long in an east and west direction, and half a mile 

 wide from north to south. It is seen in the gardens of the village, 

 immediately west of the houses. At this place it is of a dark gray 

 colour, instead of the usual milk white ; it is very heavy, and will not 

 burn into lime. It is altered, perhaps, into a dolomitic rock. Good 



2. I. A. PEOC. VOL. X. 2 P 



