158 



Dr. Berger 071 the Geological Features 



ROCK-MEASURES OF LUGG-GLASS* (The Green-Hollow,) 



COLLIERY AT BALLY-CASTLE IiN THE COUNTY OF ANTRIM, 



from beloic upwards. 



PUOVINCIAL TERMS. 



Hard-rock 



Till 



Rock 

 Main Till , 



Coal 



Rock . . . . . 



GEOGNOSTIC NAMES. 



Sandstone 



Slate-clay 



Sandstone, probably . 

 Main bed of Slate-clay 

 Slate Coal 



Rock 



Total 



INCHES, 



33 



33 



18 



4 



33 



1^4 



The preceding tables evince the general resemblance which the 

 members of these coal formations bear to those of other countries. 

 It is necessary to add very few remarks. 



The coal of these districts is almost entirely slate coal ; It may 

 perhaps be suggested as a general observation concerning the Irish 



* The above section relates only tojthc beds contiguous to tlie coal now worked. Sections 

 of the entire cliff have been given by Mr. Whitehurst in his Theory of the Earth, page 260, 

 and by Mr. Dubordieu in the Statistical Survey of Antrim ; but it is impossible to reconcile 

 the one to the other. From the hasty survey which I was myself able to take of this 

 spot, I can only furnish the following particulars : — 



The total height of Cross Hill, in the north face of which the collieries are worked, is 

 about 300 feet, of this elevation about 1 50 feet is formed by a cap of columnar green-stone, 

 which reposes on alternating strata of sandstone and slate-clay, these extend about 130 feet 

 in depth, and cover the bed of coal in which the workings are situated, and which occurs at 

 an elevation of about 200 feet above the beach ; below it are other strata of slate-clay, with 

 perhaps some seams of imperfect coal and sandstone, and we particularly observed beds of 

 the latter rock, of an intensely red colour and of enormous thickness : lastly, sUata 

 of limestone are seen emerging from the sea towards the west of the collieries ; the interval 

 between the coal and the limestone is much concealed by slopes of debris, covered with an 

 imperfect vegetation, which rest against the base of the clifi". 



An opinion is prevalent among some of the miners, that a thicker stratum of coal than that 

 at present in working would be found by driving adits beneath the level of the sea. 



