372 Scientific Proceedings, Ropal Duhlin Society, . 



Leinster field are only about 1300 feet, tlie difference should be 

 taken off the base of the coal -bearing portion of the latter ; but 

 even if this were done (which, I believe, would be absurd, as the 

 measures below the Qale Hill and StinJdng coals are very similar) it 

 would not mend matters ; not even if 300 feet were taken from it, 

 and the Kingscote coal was supposed to represent the Stinking vein. 

 In the latter case the Main coal would be about opposite the One- 

 foot with its Jarrotv Channel ; but none of the other workable coals 

 would come in at about similar heights. 



From the facts that have been proved from the examination of 

 all the Irish coal-fields, it appears a waste of labour and an unprofit- 

 able task to attempt a correlation of the Irish coals ; as it has been 

 proved that, although the Irish Coal-measures, as a mass or group, 

 were accumulating at one and the same time, the individual accu- 

 mulations were of different characters, even at places not far apart, 

 this being specially the case in reference to those due to vegetable 

 decay or the mineralizing of vegetable matter ; none of the latter 

 being on similar horizons, or even on nearly similar horizons, 

 except perhaps the lowest coal of the different fields. Thus in the 

 eastern portion of the Leinster field there appears to be in an equal 

 thickness of strata more coals than in the western portion ; while 

 in similar thicknesses of the Leinster and Tipperary fields there 

 are more in the latter ; and in the Cork field more than in either. 

 But if we go north from Cork into Limerick, Kerry, and Clare, the 

 number, thickness, and quality of the coals rapidly changes ; they 

 being at the lowest in every way in the county Clare, and perhaps 

 county Kerry. It is unnecessary to mention the coals of Ulster and 

 Connaught, which differ so completely, as to their circumstances, 

 from those which form the subject of this Paper. 



NOTE ADDED 1^ THE PRESS. 



It has been pointed out by Captain SutclifFe, and can also be seen in 

 the section, Plate XI Y., fig. 2, that the thickness of the strata between 

 the Three- foot coal and the Jar row coal increases from the edge of the 

 Channel to its centre, from 209 yards to 216 yards; while the underlying 

 black shale has increased from a foot in thickness, at the edge of the 

 Channel, to twelve feet or more at the centre or deepest portion. 

 ' A copy of Popping and Edge's section is deposited in the Mining 

 Record Office, London. 



