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XLV.— NOTES ON THE COAL SEAMS OF THE LEINSTER AND 

 TIPPERARY COAL-FIELDS. By G. H. KINAHAN, 

 M.R.I. A., &c. (Plate XIY.) 



[Eead, January 19, 1885.] 



The earliest attempts to classify the coal-seams of the Leinster 

 and Tipperary fields seem to have been those of Griffith, at the 

 beginning of the century; the results of his explorations having 

 been published about the year 1814. Many years afterwards 

 Messrs. B. B. Edge, and A. Jacob proposed a different classifi- 

 cation from that of GrriflSth for the coal-seams of the Leinster 

 field ; and the latter, after I had examined the field, was adopted 

 by Jukes in the " Greological Survey Memoir," published in 1859.^ 

 After Mr. J. M'Oarthy Meadows had proved the coal in the new 

 pit at Modubeagh, he, in the Geological Magazine for March, 1874, 

 advocated, for the most part, the classification of Grriffith. 



As I have lately been able to examine the facts proved, or to 

 be learned, from the pits and other workings in the district, since 

 I examined the field in the year 1858, perhaps I may be allowed 

 to lay the results of my investigations before the Society. 



In my " Greology of Ireland" it is pointed out that, in 1878, the 

 section of the eastern portions of the Leinster coal-field was nearly 

 quite clear ; as also that of the central portion down to a certain 

 depth ; but that the relations between the coals of those portions 

 of the field had not been proved ; because in the central portion 

 there were no coals nor measures, that could positively be stated to 

 be the same as any of those in the eastern division. A general 

 section of the measures that had been at that time, and have been 

 since, proved in the central portion of the field has been compiled 

 by Messrs. Popping and Edge, which proves a Croio coal about 

 93 yards (279 feet) below the One-foot coal. 



In Meadows' Paper (March, 1874) he states that he considered 

 my classification wrong ; as, instead of the Modubeagh coal being 

 the representative of the " Old Colliery Three-foot coal," he believed 

 that it was from 220 yards (660 feet) to 280 yards (840 feet) below 

 it. These thicknesses were from calculation, and therefore must 



1 About tlie year 1870 I modified the statements then published; which modifica- 

 tious subse(j[uoiitiy appeared in my " Geology of Ireland," chapter vi. 



