154 Dr. Berger on the Geological Features 



The shell limestone of Desartmartin re-appears two miles farther 

 to the north-east at Dromore, the strata preserving the same dip, 

 direction and characters : the quarries of Dromore are more exten- 

 sive than those of Desartmartin. 



At Gore Tarminey in the parish of Kilcrouaghan not far from 

 Dromore, the shell limestone shows itself again, but under the 

 character of swinestone : it is variegated, and contains terebratula 

 gigantea. The strata dip at an angle of 12°. 



At the coal works of Ballycastle two English miles north of 

 the town, strata of shell limestone are to be seen on the shore, 

 and may be traced at low water running out to sea in their line 

 of bearing, which is N.E. 17". they dip therefore to S.E. 73°. 



The strata are alternately solid and marly, the former constituting 

 beds of three or four feet in thickness, the latter not exceeding half 

 a foot. The solid strata are of a compact limestone with lamellar 

 and rhombic concretions, the colour smoke grey. 



I have examined several specimens of a variety of this limestone 

 containing ramose madrepores, said to have been found on the west 

 side of Lough Neagh in Tyrone. 



B. Coal Formations, 



I have to notice four partial coal formations : they occur in the 

 following counties. 



I. Tyrone : at Coal-island and Dungannon. 

 II. Antrim : near Ballycastle. 



1. Two Coal jields^ as coal formations are usually styled in 

 England, exist in the county of Tyrone, at no great distance the 



