1 80 Mr. Griffith on the Syenite Veins which traverse Mica Slate 



trap, which at its northern extremity, forms the magnificent promontory, 

 called Fair Head. 



The mica slate is distinctly bedded, and passes from a fine-grained, shining, slaty rock, into a 

 coarsely granular gneiss. Its subordinate strata are hornblende slate and schistose limestone ; 

 the latter occurring in several places, particularly on the sea shore, close to the south side of 

 Torr Point, and on the shore at West Torr. At Goodland Cliff, near the northern extremity, the 

 dip is north-west, at an angle of 15° from the horizon, and the subordinate beds of schistose 

 limestone and hornblende slate dip conformably with the mica schist, and are consequently con- 

 temporaneous portions of it. Other rocks containing hornblende are, however, frequently associated 

 with the mica slate, and though apparently imbedded with that rock, are veins which have been 

 intruded, subsequently to its formation. This is particularly the case at Torr Point and other 

 localities, one of the most remarkable of which is on the sea shore, half a mile to the south of 

 the commencement of the mica slate in Murlough Bay, where are two decidedly intruded veins of 

 syenite, which pass into syenitic greenstone. (See the following cut, No. 2.) 



No. 2. 



Syenite veins (e) passing through mica slate (a), in Goodland Cliff, south of Murlough Bay. 



These veins pass obliquely through the mica slate, in the face of the stu- 

 pendous cliff of Goodland, which is upwards of 500 feet high, and for the 

 greater part nearly perpendicular. They are clearly visible along the face of 

 the cliff for more than half a mile. At the sea shore, the veins appear to 

 range so regularly and conformably with the strata of mica slate, both 

 in strike and dip, that if not closely examined they might be considered 

 subordinate beds ; but on minute inspection, it will be found that the edges 



