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found. This he did by placing over each other, in a tilted position, 

 a number of little logs representing the various strata, with the 

 name on each as follows, beginning with the lowest systems : 

 — Cambrian, Silurian, Devonian, Carboniferous, Permian, Triassic, 

 Liassic, Oolite, Cretaceous, Tertiary, and Superficial. All these 

 systems, excepting the Devonian and Oolite, are represented 

 in the neighbourhood of Belfast. We must not suppose that 

 any particular rock is confined to a special system. The lime- 

 stone, although principally constituting the Cretaceous system, 

 is found in all the others ; and so the coal, although belonging to 

 the Carboniferous strictly, is frequently found in the other strata. 

 In the County Cavan coal is found in the Silurian rocks ; and in 

 New Brunswick and the United States the coal was obtained from 

 the Devonian. Coal beds are also found in the Oolite, Cretaceous, 

 and even in the Tertiary rocks. The coal of Killymurris, in County 

 Antrim, belongs to the Tertiary age, being found in the Trap rocks. 

 But the true stratigraphical position of coal was in the Carbonifer- 

 ous system, where all the great coal fields of the world were found. 

 Mr. Gray then pointed out the rocks that occur around Belfast, 

 how they occur, and their relation to the Carboniferous system. 

 This he did, with the assistance of a number of neatly-executed 

 models and diagrams, in a very simple and popular manner ; and 

 having shown that in the neighbourhood there were the Silurian 

 rocks of the County Down, which occur below coal, and the New 

 Red Sandstone and Permian which occur above coal, the line be- 

 tween the two was the place where coal, or the Carboniferous 

 system, should be; but, having thus found where our friend lives, 

 the question now became, was he at home ? To ascertain this, Mr. 

 Gray said he must inquire of the neighbours — those are the sur- 

 rounding strata ; and he then alluded to the beds developed in the 

 locality of Belfast, with a view of ascertaining whether there was 

 in them any indication of the Carboniferous system, and by re- 

 ference to the geological map and prepared section, he showed 

 that beds existing in the neighbourhood were, first, the tilted and 

 upturned Silurian strata of the County Down, and next above 

 were the Permian beds of Cultra, which underlie the New Red 



