[ 179 ] 



XIV. — On the Syenite Veins which traverse Mica Slate and Chalk at 

 Goodland Cliff and Torr Eskert, to the south of Fair Head, in the 

 County of Antrim. 



By RICHARD GRIFFITH, Esq.,F.G.S., M.R.I. A., P.G.S. of Dublin, &c. 



[Read January 6, 1836.] 



The geology of the northern portion of the county of Antrim, has been 

 often treated of; but there are several interesting facts, which have appa- 

 rently escaped the attention of preceding observers. One of the most import- 

 ant v*'as described by me in the Geological Section at the late meeting of the 

 British Association in Dublin ; and I have since revisited the place, accom- 

 panied by my friends Professor Sedgwick and Mr. Murchison, at whose re- 

 quest I have prepared the following memoir for the Geological Society*. 



The part of Antrim to which this paper refers, is situated between Fair 

 Head, on the north, and Cushleake Mountain, on the south. 



The geological structure of the country is exhibited in the accompanying 

 section. No. 1. It will be seen, that mica slate forms the substratum or base 



No, 1. 



a, Mica slate ; i, coal shale ; b with clots, coal sandstone ; c, new red sandstone; d, chalk ; 

 e, trap, or syenite. 



of the country; that secondary rocks, belonging to the coal formation, the 

 new red sandstone, and chalk rest upon it unconformably ; and that these 

 secondary rocks are surmounted by an overlying mass of rudely columnar 



* These veins, together with that at Torr Eskert, were originally observed by Mr. Nicholson, 

 one of the first class of valuators employed on the general valuation of Ireland. 



2 A 2 



