GEOLOGICAL SOCIETY OF DUBLIN. 139 



portion of the same district, but nearly at right angles to that exhibited 

 at Liverpool, which I have just described. This section was exhibited 

 at the meeting of the British Association held at Manchester in the year 

 1842, and it clearly shows the relative positions of the different members 

 of the series; and it is the accuracy of this section which is endeavoured 

 to be impugned by Mr. John Kelly, who conceives that the shales and 

 sandstones, as there represented by me as belonging to the Calp series, 

 really belong to the Old Eed Sandstone, and the equivocal position in 

 which the strata occur is accounted for by him by a great east and west 

 fault, extending from the north-west end of Lough Erne to the sea- coast 

 south of Bundoran, in the county of Donegal. But there are no grounds 

 for this supposition. No doubt there is a fault, of trifling character, 

 having a north and south direction, visible near the coast south of Bun- 

 doran ; but in this case the strata, on both sides, belong to the same Calp 

 series, as described by me, while its north and south direction contri- 

 butes nothing towards sustaining Mr. Kelly's assumption of the great 

 fault extending westward from Lough Erne to the sea-coast near Bun- 

 doran ; and the only argument he has brought forward in support of his 

 opinion is, that the level of the millstone grit at Shean Hill, on the 

 south side of Lough Erne, is 1135 feet above the sea, while the mill- 

 stone grit on the north shore of Lough Erne is only 150 feet above the 

 sea; and, arguing on this difference of 985 feet, he assumes that a down- 

 throw of about 1000 feet has taken place between the north and south 

 shores of Lower Lough Erne. But Mr. Kelly's basis for the argument has 

 no foundation, because the strata on the north shore of Lough Erne consist 

 of yellow sandstone, and not of millstone grit. If Mr. Kelly has not 

 himself examined this district with a view of ascertaining whether his 

 fabric of faults was well founded, and if, in default of his own observa- 

 tions, he depended on published data supplied by me, he should have 

 referred to the latest edition of my " Geological Map," or, indeed, to 

 any publication of that document, even to the comparatively imperfect 

 small one first published in the "Atlas" attached to the " Irish Railway 

 Commissioners' Report," in which the country forming the north shore 

 of Lower Lough Erne is represented as belonging to the Carboniferous 

 Limestone series, and not to the millstone grit. No doubt in the printed 

 geological "Outline" itself, owing to a want of accurate information at the 

 time, and basing the supposition on the occurrence of a thin bed of coal, 

 it is mentioned that a millstone grit district extended from Druniquin 

 "towards" Lough Erne ; but no just conclusion can be drawn that the 

 expression " towards Lough Erne" has the signification of the expression 

 "to Lough Erne;" and had Mr. Kelly examined any of my published 

 Maps, he could not have fallen into error in this respect. But I must 

 confess that it appears to me to be unusual as well as unaccountable that 

 the data used by Mr. Kelly, in his endeavour to overthrow the system 

 of geological classification adopted by me, should have been derived, not 

 from any of my more recent publications, but from a hasty " Outline," 

 written nearly twenty years ago. Should he not in such case have inves- 



