of the North of Ireland. 147 



B. TratisitioTi Limestone. 



The entrance of the noble bay of Carlingford is bounded on the 

 south-west side by an obtuse point of land very low, and almost on 

 a dead level, whence the Foy mountain boldly rises, falling away 

 to the south towards Cooley, where it forms the ridge named 

 Golding mountain. 



The greater part of this flat point of land, ending on the north at 

 Carlingford Castle, is occupied by a limestone formation which I am 

 disposed to refer to that of transition. 



It covers a square surface of about nine English miles, reappearing 

 at the Block-house island in the middle of the bay, but I am not 

 aware that there are any vestiges of it on the shore in the county of 

 Down, which limits the north-east side of the bay. 



The strata lean on the east side of the Golding mountain dipping 

 to the south east : they however rise to a very inconsiderable 

 height upon its abrupt declivity. 



There are quarries opened in a continual line to the extent nearly 

 of one English mile, at the foot of the Golding mountain, the depth 

 of the quarries varying from fifty to eighty feet : limestone is raised 

 besides in other places nearer to the shore, at Cooley, Mullaghtre, 

 and the Gan rocks. 



This limestone is remarkable, because it alternates both with 

 transition trap and with greywacke slate ; evidently so with the 

 former at Cooley, and with the latter at the Gan rocks. 



The solid strata are frequently traversed by veins and thin layers 

 of calcareous spar : between them intervene many thinner beds 

 passing into slaty marl. 



T 3 



