412 Scientific Proceedings, Royal Dublin Society. 



from which camstone appears to have been procured rather exten- 

 sively informer years; at present it is only raised to be used for 

 hearths or the backing of fire-places. 



In places between Raphoe and Letterkenny camstones have 

 been found, but they seem to be only used for local purposes. 



In the townland of Cabrabrook, E. S. E. of Church Hill, is a 

 oamstone that appears to have been quarried formerly, but for 

 years the quarry has been filled up. 



In Carrowtrasna, west of Lough Akibbon, and over two miles 

 northward of Church Hill, is a bed that has been mined by Mr. 

 Duckworth for some years, and sent to Liverpool, to be used in the 

 manufacture of lubricators ; but on his death a few years ago the 

 industry was abandoned. 



Beds of camstone associated with limestone can be seen in dif- 

 ferent places in the hill country westward of Kilmacrennan, but it 

 does not appear to have been worked recently except to get clay for 

 hearths. At Cloonkilly there was a large working ; it is probably 

 the locality referred to by Wilkinson 



There is a bed or beds to the north and north-east of Ramelton 

 and in the neighbourhood of Carn it has been worked along the 

 surface to obtain fireclay. 



Westward of Rathmullen, in the townland of Meenreagh, there 

 is a bed of camstone. 



LIMESTONE QUAEEIES. 



[The quarries will be arranged in the counties placed alphabetically under their 

 .geological group. Generally only the quarries that give stones fit for cut- stone 

 purposes will be mentioned, except in counties where limestone for burning is scarce, 

 under which circumstance all the localities are given. In some localities, where 

 quarries are scarce or altogether absent, limestone boulders are found in the drift, and 

 are collected along the sea-coast, river, and streams ; while in other places sea-shells 

 are carried inland and burned. Tradition says that lime made from sea-shells was used 

 ^as a medicine.] 



Antrim. 



In this county there is no Carboniferous limestone except what 

 occurs as subordinate beds in the Ballycastle coal-field ; and in 

 these no quarry of any note seems to have been worked. 



The Cretaceous, or White Limestone, occurs round the margin of 



