236 



Comparison of the Heights of Mountains on the East and West Sides 

 of the great Basaltic Area of Antrim and Derry. 



Berry Side. 



Feet. 



Benyevenagh, five miles north-east 



of Newtownlimavady, . . . . 1260 



Keady, four miles north-east of 



Newtownlimavady, 1101 



Donald's Hill, six miles south-east 



of Newtownlimavady, . . . . 1318 



Benbradagh, three miles north-east 



of Dungiven, 1531 



Carn Hill, three miles east of Dun- 

 given, 1479 



White Mountain, six miles north- 

 west of Draperstown, . . . . 1773 



Craignashouk, five miles north- 

 west of Draperstown, . . . . 1586 



Slieve Doan, four miles west of 



Draperstown, 1733 



Slieve Gallion, five miles south-east 



of Draperstown, 1730 



Antrim Side. 



Feet. 



Knocklayd, three miles south of 



Ballycastle, 1685 



Glenmakeeran, four miles west of 



Cushendun, 1321 



Esherry, four miles west of Cush- 



indall, 1197 



Trostan, four miles south-west of 



Cushindall, 1810 



Nachore, two miles south-west of 



Garron Point, 1179 



Collin, six miles west of Glenarm, 1419 

 Slemish, eight miles south-west of 



Glenarm, 1457 



Agnew's Hill, four miles west of 



Larne, 1558 



Divis, four miles west of Belfast, 1567 



From Divis to Knocklayd is 40 miles ; so that the abovementioned 

 nine mountains in Antrim are, on the average, five miles asunder. On 

 the Derry side the distances of the mountains asunder are nearly the 

 same. 



Such is a brief outline of the physical features of the district. 



ROCKS OF ANTRIM. 



The older stratified rocks of this northern district, taking the usual 

 succession are: — 1, Quartz Rock; 2, Mica Slate; 3, Primary Lime- 

 stone ; 4, Devonian Brown Sandstone ; the Carboniferous System, com- 

 prising : 6, Old Red Sandstone ; 7, Mountain Limestone ; and 8, the 

 Coal Measures. These older rocks are succeeded by the secondary sys- 

 tem, which, consists of : 9, New Red Sandstone, with its rocksalt and 

 gypsum; 10, Lias; 11, Greensand; and 12, Chalk — or, as it is usually 

 called — white limestone. 



Of the crystalline, or erupted rocks, there are : Syenite, Green- 

 stone, and Trap, or Basalt. This latter is the rock which appears at 

 the surface in the greater part of the country. It overlies the chalk 

 generally, but it is sometimes seen lying on other rocks. 



The occurrence of the older rocks, though in one group in the nor- 

 thern parts of Antrim, is very irregular, and very limited. 



STRATIFIED ROCKS. 

 Quartz Rock. 



Quartz Rock, or as it is conveniently termed, Quartzite, consists of 

 granular quartz, of various colours ; and very hard quartzose grits are 

 also sometimes included in it, though it would be better to confine the 



