118 PROCEEDINGS OF SOCIETIES. 



respect, and were once joined and continuous in the same band, though 

 now separated from each other in some localities by dislocation, to 

 the amount of 1500 or 1800 feet in difference of level. 



If geologists who may hereafter examine this district should think 

 my views correct, I need say no more about the calp, as this is the loca- 

 lity in which the idea of its existence, as a geological subdivision of the 

 Limestone originated, as stated in the quotation JSio. 7 ; and if it be not 

 here, it is not anywhere. The sandstone at Bundoran I take to be the 

 Old Bed, and the black slate, on both sides of it, the Carboniferous Slate 

 in position, as I have described, and the geological place of all below the 

 limestone.* 



The sandstones of the other calp districts of Ireland are not Old Eed 

 Sandstone, but the sandstones of the Coal series. As, to show this, de- 

 pends on arguments which constitute a different kind of proof from those 

 just advanced of the truth of the views I take, I shall, therefore, pro- 

 ceed to notice them. 



To the west of Lough Erne a calp sandstone is shown on the " Map" 

 in a band of irregular breadth, from Churchhill, by Derrygonnelly, to 

 Lisbofin, near Enniskillen. This is Old Red Sandstone, the equivalent, 

 and in exactly similar circumstances, with that at Bundoran, being 



* Strangers reading this paper may ask, who is this that has written a paper 

 against Mr. Griffith's views on the Geology of Ireland? Some obscure individual 

 against a man of European reputation! For the information of such, I shall state a 

 few facts : — I spent nearly the whole of the business-part of my life in Mr. Griffith's 

 employment. I engaged with him in the spring of 1814. He was then Mining En- 

 gineer to the Dublin Society. The first work I did for him was to copy the manu- 

 script and assist in making the map and sections of the Leinster coal district, his own 

 first " Geological Essay," which was then preparing for the Dublin Society for pub- 

 lication. For eight years afterwards I accompanied him, a part of eacb year, in his 

 geological excursions, surveying, drawing maps, and tracing rock boundaries, drawing 

 diagrams, and making mining models for his lectures. We began, in 1816, a section 

 across Ireland, beginning with the Mourne mountains, and ending at the sea near 

 Sligo. The heights were measured with barometers. He met with an accident, 

 which disabled him, about the middle of this journey, and had to stop at Castle- 

 saunderson, and I continued the section alone. In 1822, when he was appointed, by 

 the Lord Lieutenant, Civil Engineer over the south of Ireland, I assisted — surveying, 

 estimating, and marking out new lines of road, then completing some of them, and 

 building the bridges.; and here the knowledge I had acquired of Geology was important, 

 enabling me, by following the strike and outcrop of the bed of rock, to discover many 

 useful quarries, in places covered with bog or drift, where they were not known be- 

 fore. In 1830 I was transferred to the General Valuation of Ireland, then com- 

 mencing. In this work I was every day on strange ground ; marked the kinds and 

 dips of the rocks on the maps I was using; and from this to 1850 I visited every 

 barony in the three northern provinces of Ireland ; I collected fossils in about 300 

 localities ; I was at Bundoran, a place which is the subject of dispute in this paper, 

 for several days. Mr. Griffith and I were there together one day. I showed him much 

 of what I had previously observed ; but he had not time to see all. If experience be 

 useful, I had the best of it here, for I was as many days in it as he was hours; and so 

 in most other places in the north. My opportunity there was good, and my attention 

 unremitting. To the Geological Society of Dublin is now due the credit of raking 

 up errors that might have gone on to posterity uncorrected, or even unnoticed, but 

 for them. 



