254 Scientific Proceedings, Royal Dublin Society. 



Near Duleek and Naul, the latter being just within the Co. 

 Dublin, there are similar rocks in the Ordovicians. Some of the 

 whinstones near Balbriggan were considered by Jukes to be 

 eminently suitable for paving-setts. 



In Monaghan, Longford, and Westmeath there are not any 

 metamorphic rocks ; nor does there seem to be any exposure of 

 exotic rocks in those counties. 



