Kinahan — On Irish Arenaceous Rocks. 531 



The descriptions are given in the counties, arranged in alpha- 

 betical order, under the different Geological groups, as adopted in 

 the Table of Strata in the Introduction to the Paper on Metal 

 Mining {ante, p. 204). The records of the Sands and Gravels are 

 not as full as they ought to be ; but on these subjects it is hard to 

 get satisfactory information, as most previous writers have, in a 

 great measure, ignored them, except in general description, from 

 which very few details can be learned. 



In the compiling of this Paper, as in the previous one on 

 " Marbles and Limestones," I have necessarily been greatly in- 

 debted to Wilkinson's standard work ; and of all stones mentioned 

 by him his descriptions are given, except that his arrangement is 

 modified to suit mine. I have also consulted Lewis, and the 

 Memoirs of the Geological Survey, the quotations from the latter 

 being initialed G. 8. M. But the information from Lewis cannot 

 be specially acknowledged, it being too general, and having after- 

 wards to be verified. I have also received valuable information 

 from the Officers of the Board of Works, through Mr. Commis- 

 sioner S. IT. Roberts ; some of the County Surveyors, and various 

 private individuals ; whose aid, when possible, has been acknow- 

 ledged ; but in many cases this was impossible, as the same in- 

 formation was received from different sources, or the different 

 information about one place had to be incorporated. 



COUNTY HISTORIES. 



ANTRIM. 



Arenig (?) or Ordovician (?). — To the north-east of the 

 county, principally in the barony of Cary, now better known as 

 the Bally castle district, is a considerable tract of metamorphio 

 rocks, probably the equivalents of either the Ordovician or Arenig. 

 Among these are some rocks that still in part partake of the nature 

 of grits or quartzyte, but none of them are eminently suitable for 

 cut-stone purposes. 



SCIEN. PROC. ll.D.S. — VOL. V., I'T. VII. 2 



