Kinahan — On Irish Arenaceous Rocks. 607 



silieious grains ; a little felspathio cement ; when ferriferous they 

 have a reddish tinge. 



Elderwood. Three miles from Fivemiletown. — Eeddish ; sili- 

 eious grained ; felspathio cement. 



Caveij. One mile from Ballygawly. — Yellowish ; silieious ; a 

 little cement ; fine-grained ; ferriferous. The conglomerates near 

 Ballygawly were formerly wrought into millstones and flax- 

 crushers. 



Calp {Ulster type). — Many of them are beautiful stones — 

 creamy or yellowish in colour, or with a bluish tint. In general 

 they are free-working, open-grained, and capable of producing- 

 good work; some, however, are not suitable for heavy bearing. 

 From the ancient buildings in which they were used they seem 

 to be very durable. 



These sandstones occur in limited thicknesses of strata, the 

 "over-bearing" or cover-rocks being limestones or shale. This, as 

 the quarry is worked in on the dip (which is low) of the stone, 

 very often becomes excessive, so that the expense of removing it 

 may become greater than the value of the stone. In other quar- 

 ries the good stone occurs in more or less lenticular or other masses, 

 adjoining which the stones are inferior. For these causes, quarries 

 once famous are now worked out or abandoned. 



Cookstown. In different quarries in the vicinity of. — Yellowish, 

 creamy, or with a bluish tint; silicious-grained ; a little argillo- 

 silicious cement ; open-grained ; slightly micaceous ; soft, and not 

 suitable for heavy bearings. Mr. Dickinson states : — " Some of 

 the beds are hard and excellent for all kinds of masonry." From 

 Tamlaght quarries were procured the stones used in the Lower 

 Bann navigation works, while those used in the building of Killy- 

 more Castle came from the quarry nearly a mile north-west of the 

 workhouse. Stones from the Cookstown quarries were also "used 

 in the Provincial Bank, Belfast : a light, tough sandstone, hard to 

 dress, and does not stand." — (W. Grey.) 



Kilclress. Stones very similar to those of Cookstown. 



Loughrea. South of Cookstown. — Similar stone. 



Trinmadan. Nearly two miles from Grortin. — Yellowish ; quartz 

 grains ; argillo-silicious cement ; granular. 



Carrickmore, four miles from Grortin ; Douglas Bridge, eight miles 

 from Strabane ; MuUinavarra, three miles from Castlederg ; Berry- 



