THE 



LONDON AND EDINBURGH 

 PHILOSOPHICAL MAGAZINE 



AND 



JOURNAL OF SCIENCE, 



[THIRD SERIES.] 



MARCH 1840. 



XXX. On the true Order of Successioii of the Older Stratified 

 Rocks in the Neighhonrhood of Killarney and to the North of 

 Duhlin. By Richard Griffith, ^5^., F.G.S. L., and 

 President of the Geological Society of Dublin. 



[See Section Plate II. and Plan PI. III.] 



To the Editors of the Philosophical Magazine and Journal. 



Gentlemen, 

 nPHE Geological map of Ireland, which presents an epi- 

 -^ tome of my geological labours in the field, continued 

 at intervals for upwards of thirty years, is now before the 

 public, and has in fact become their property. Though I 

 do not venture to assert that all the lines representing rock 

 boundaries which it contains are perfectly correct, still I will 

 say that none have been laid down without consideration. 

 Much detail no doubt still requires to be worked out within 

 the great divisions, particularly in the carboniferous lime- 

 stone series, and many of the smaller greenstone protrusions 

 have yet to be pointed out; but I am fully of opinion that 

 the great lines nearly represent the true boundaries of the 

 several rock formations, according to the order of superposi- 

 tion indicated by the table of geological colours. Having this 

 impression on my mind, I confess I was somewhat startled by 

 observing in the Number of the Philosophical Magazine for 

 December last, (vol. xv. p. 442.) a paper communicated by my 

 friend Mr. Charles William Hamilton of Dublin, which con- 

 tains statements, some of which are illustrated by sections, re- 

 lative to the geological positions of the strata of several parts 

 of Ireland, quite at variance with those assigned by me to the 

 same rocks in the geological map. This paper also asserts 

 that I have indicated the occurrence of rocks in certain places 

 in which no such rocks are to be found. These are charges 

 Phil. Mag. S. 3. Vol. 16. No. 102. March 1840. M 



