140 Dr. Berger o« the Geological Features 



The strata are alternately coarsely and finely slaty : the thick- 

 ness of the whole mass may be rated at fifty feet. Veins of 

 calcareous spar intervene as seams between the individual strata. 



At Toberbilly, on the north-west side of Knocklead, near 

 Ballycastle, at an elevation of four hundred and ninety-four feet 

 above the level of the sea, I traced a bed of granular and micaceous 

 limestone through a considerable extent towards the town-land of 

 Cloughamany. 



The concretions are rather small, and there are linings of talc 

 along the seams of stratification. 



D. Primitive Trap. 



The remark of Werner, that primitive trap contains no iron 

 clay, but is wholly or almost entirely composed of hornblende, 

 appears to be extremely appropriate, and to draw an excellent line 

 of demarcation between primitive and the secondary trap. 



1. a. Common Hornblende Rock, 



More than two-thirds of the Foy mountain, near Carlingford, 

 are composed of a succession of stairs formed of primitive trap. 

 Proceeding from the bottom towards the summit of that moun- 



