Kinahan — States and Clays (Bricks, 8fc). 87 



LONDONDERRY. 



In the parish of Muff, and in other places, there are green, 

 chloritic, coarse slates (Ordovician?), which are used locally for 

 roofing purposes. 



LONGFORD. 



Derrycrois, west of Granard, a good-looking slate ; as yet untried. 



LOUTH. 



The greater portion of this county is occupied by Ordovician 

 rocks, in which are different slate veins ; but the products of these 

 seem not to have been favourably received as roofing slate, 

 although excellent for general building purposes (p. 102). 



Near Mellifont the slates can be raised in large slabs, and some 

 of them have also been used as roofing slates ; but these are not 

 much approved of, being too heavy ; however, some of the veins 

 in this neighbourhood, if worked on in depth, would doubtless 

 improve greatly. 



Crcggan, W.N. W. of Dundalk, a coarse and heavy, but durable 

 slate. 



MAYO. 



At Lanmorc, between five and six miles south-east of Westport, 

 there are dark-grey Ordovician slates, which have been quarried 

 along the outcrop to supply roofing slates in Westport and that 

 neighbourhood. 



At JJerrygarve, about six miles southward of Louisburg, there 

 is a thin vein of a good bluish-grey slate of a fair quality, but 

 of too small dimensions to be worth much. The slate is used in 

 Louisburg. 



Along the north shore of Killary Harbour there are also 

 Ordovician slates to the east of Bundorragha. Some of them have 

 a good appearance ; but as yet no trials have been made. 



Parish of Kilfian, west of Killala ; in different places small 

 quarries produce a coarse slate. 



SCIEN. PttOC. R.D.S. VOL. VI., PT. II. H 



