164 Dr. Berger Oft the Geological Features 



Ikence by Moneymore towards Lissane; on the Canesee river, a small 

 brook which is crossed in passing between the two last mentioned 

 villages, strata of sandstone conglomerate are found. 



Near Cookstown, grey sandstone passing into white occurs on 

 the road to Dungannon, it extends beyond the bridge over the 

 Black water river, the outgoings of the strata rise south-west 

 43° under an angle of 8°. There are other sandstone quarries one 

 mile and a half from Cookstown towards Moneymord ; a red variety 

 is here found, it is finely granular, with a calcareous cement, the 

 strata crop out south-west 53°, at an angle which varies from 13" 

 to 25° as they increase in depth. 



At Coal island, in the county of Tyrone, sandstone constitutes 

 the superficial stratum, two varieties may there be distinguished, both 

 however agreeing in having a siliceous cement ; the one is hard, co- 

 herent, and finely granular, of a yellowish grey tinge, with spangles 

 of bright mica abundantly disseminated ; the other is characterised 

 by a looser and coarser texture, an inferior specific gravity, and 

 fewer spangles of mica. 



D. Lias. 



^This article is applied by the Editor from the joint observations 

 of Mr. Buckland and himself, the route pursued by Dr. Berger, 

 not having allowed him to examine this formation in the points 

 ^hich exhibit it to the greatest advantage.] 



This formation consists of beds of slate clay alternating with thin 

 seams of argillaceous limestone ; the limestone is compact but not 

 crystalline, of a bluish colour passing into smoke grey ; the fossils 

 which characterise it are cornua ammonis, gryphites, and the colum- 



