of the North of Ireland. 149 



Oa the east side of Slieve Gallion at the head of a narrow glen 

 called Tinteagh Glen, about 1300 feet above che level of the- sea, 

 crop out several unconnected masses of greenstone. 



They are totally unconnected with the flat stratified trap which 

 overlies the chalk, and crowns the summit of the mountain. The 

 fissures are lined with calcareous spar, and veins of crystallized heavy 

 spar and of red compact iron stone are contained in this rock. 



D. Old Red Safidstone, 



lliis formation has been observed only in the two following 

 districts, and even there its extent appeared to be very limited. 



1. In the county of Down, on the sides of Strangford lough. 



2. On the N.E. coast of Antrim, between the bays of Cushendall 

 and Cushendon -, and again in Murloch bay. 



Vestiges indicative of the old sandstone may also be traced along 

 part of the shore of the Isle of Rathlin opposite Fairhead. 



The tract of sandstone first specified extends from the ^.N.E, 

 side of Strangford lough to Scabro hill on the opposite side of 

 that lough, appearing likewise at Ballymasca, Dunlady, and Kirk- 

 donnel. 



Scabro hill rises 483 feet above Strangford lough, its summit Is 

 composed of a cap of greenstone about 150 feet in thickness; the 

 remaining 330 consist principally of the sandstone, which may be 

 observed in one* of the quarries opened on that hill (to procure this 

 material for architectural purposes) in distinct beds of very variable 

 thickness alternating with greywacke. 



* The name of this quarry is the White quarry 



