on the Older Stratified Rocks near Killarney and Dublin. 271 



presentation is correct and Mr. Griffith's incorrect ; and as it 

 is a point easily accessible to any geologist who may visit 

 Killarney, I do hope that some one will take the trouble of 

 comparing the two observations. I believe that the suc- 

 cession of the strata is in exactly the reversed order, that 

 there is an anticlinal on the summit of Glena mountain, that 

 the strata on the south-eastern slopes dip to the S.E. at an 

 angle approaching very nearly to the perpendicular, and that 

 consequently the slates at the back of Lady Kenmare's cot- 

 tage are in the highest and not the lowest part of the series 

 there developed. 



Mr. Griffith attaches much importance to the difference 

 of strike upon the opposite sides of the fault. I have made a 

 great many careful observations, and although until we get a 

 correct map it would be impossible to lay these down so as 

 to draw any correct conclusions from them, I may observe 

 that the observations taken at the same side of the fault vary 

 quite as much among themselves as they do with those on the 

 other side. 



In p. 173 Mr. Griffith says, " it appears to me that Mr. 

 Hamilton is mistaken in separating the old red sandstone 

 from the Devonian system ;" but the very quotation he makes 

 explains clearly that I made no such separation, but referred 

 the compact arenaceous rocks overlying the coarse red con- 

 glomerate to the upper part of the Devonian system. 



I shall not occupy your pages with other points in which 

 I am still hardy enough to rely upon my own observations in 

 opposition to so high an authority as my friend Mr. Griffith ; 

 but I could not leave these unnoticed, because I wish to press 

 upon the attention of geologists the fact that the difficulties 

 of this district have not yet been cleared away, and that Mr. 

 Griffith is premature in referring to the Silurian epoch, that 

 vast depth of sandstone and conglomerate which occurs be- 

 tween the bays of Kenmare and Castlemaine, and the whole 

 section between Foillatarriv and Brandon ; I have before 

 expressed my opinion (Journal of the Geological Society of 

 Dublin, vol. i. p. 282.) that this latter section bears the 

 strictest analogy to that between the Bangor quarries and 

 Llyn Schal, and I see no reason for retracting that opinion. 



To Mr. Weaver's remarks and insinuations of " an unre- 

 strained indulgence of fancy," &c., I shall not reply ; his ob- 

 jections to the possibility of the old red sandstone dipping in 

 one place to the south, and another to the north, seem hardly 

 to require an answer ; and the correctness of his observations 

 has been already subjected to a sufficiently rigorous inquiry 

 by Mr. Griffith. 



