Kin ah an — On Irish Arenaceous Rocks. 617 



used as manure on the " marl land," being considered most bene- 

 ficial if brought from below high- water mark "with the sea in 

 it : " that is, when wet and salty, it was considered better than 

 if the salt was worked out of it. 



In the Gorey district, and the upper portion of the Slaney valley, 

 there is good pit sand and gravel, also at the Deeps, to the north- 

 ward of "Wexford, and in some other places. Good river sand can 

 be procured in limited portions of the Slaney, and the other rivers 

 and streams. 



WICKLOW. 



In this county sandstones or allied rocks that are now in favour 

 for cut-stone purposes are few. The area is solely occupied by 

 Granite, Cambrian, and Ordovician, the latter in a great measure 

 metamorphosed. 



In the Cambrian at Bray Head, and also in the hills north- 

 east of Togher or Eoundwood, there are extremely hard green grits, 

 and, in other places, the quartz rocks are well suited for road- 

 metal ; but some of the more regularly-bedded and granular 

 varieties of the quartzytes might possibly be worked. 



Glencormick. North of the Great Sugarloaf. — Warm cream 

 colour ; fine-grained ; silicious, thin-bedded ; cuts easily and well. 

 Extensively used in Bray and other places in that neighbour- 

 hood. — (T. B. Grierson.) 



In the less altered Oedovicians, near the west margin of the 

 county, are interbedded green tuffose sandstones, allied to those 

 described in the Co. Wexford. Some of them were used in the 

 old structures, and gave good, durable work. At the Seven 

 Churches, Glendalough, in the building now called " St. Kevin's 

 Kitchen," a metamorphosed stone, apparently of this class, was 

 cut to the slope of the stone roof, besides being worked in other 

 ways, as in a carving over the doorway of the structure now called 

 " The Library." 



Sand and Gravel. — Pit sand and gravel occurs in places in 

 nearly all the valleys; and from the washing of them by the 

 streams, good river sands are produced. 



For long distances along the seaboard are greater or less 

 accumulations of Molian Sand. At Arklow, the fine sand drifted 



