124 .The Rev. W. CoNYBEARE o« /i6^ 



From its southern boundary it emits two water courses j the 

 Mayowla which takes an eastern direction and flows into Lough 

 Neagh ; and the Moyle which passes to the west and joins the 

 Strabane river. 



On tlie north the Fanghan waters a beautiful valley, at length 

 discharging itself into Lough Foyle. 



Sawell is the highest point of this group : Dr. Berger has fixed 

 its altitude at 2257 feet above the sea. The whole of this extensive 

 and lofty tract is primitive to the very front towards Lough Foyle. 

 Mica slate is the predominating rock, constituting exclusively almost 

 nine-tenths of the district : it is accompanied by primitive limestone 

 in the lower part of the country. 



On the eastern bank of the Roe this system of mountains is 

 succeeded by a range of secondary heights, covered by an enormous 

 platform of basalt and forming a part of that system which will in 

 the next place be described. These secondary masses repose upon 

 and conceal the mica slate in the eastern part of Derry, but the mica 

 slate again emerges from beneath this covering, after an interval of 

 near 30 miles, in the N.E. of Antrim, and swells into mountains 

 which break down abruptly towards the coast between Tor Point 

 and Cushenden bay. 



The exact correspondence in structure of the opposite points of 

 Ireland and Scotland here again demands our observation ; the 

 Mull of Cantire which faces Tor Point resuming the chain of mica 

 slate which was there broken off. The Cantire hills are connected 

 with the Grampians, a chain strikingly similar to that which has been 

 above described in all the circumstances of its composition ; and it 

 may be added, as compleating this analogy, that the mica slate of 

 Ireland is succeeded on the south (where the Antrim coast exhibits 

 it in section) by a conglomerate, perfectly resembling that which is 

 so well known as skirting the Grampians on their southern border. 



