474 Mr. Weaver on the Structure of the South qf Ireland, 



beyond a certain extent ? The key presented by Mr. Griffith 

 does not appear to me to answer the purpose, nor can I 

 perceive the anomaly which he conceives to arise from the 

 southerly dip being persistent * ; since among transition 

 strata some are presented to us merely as intercalated bands 

 with a corresponding dip, while others of a similar character 

 are deposited in troughs^ e. g., in Nassau and Belgium con- 

 trasted with the Eifel, as noticed in a preceding part of this 

 paper. 



The whole subject, so far from being of a mysterious cha- 

 racter t? strikes me as sufficiently clear, and which I think 

 may be made to appear by merely taking Mr. Griffith's own 

 statements for our guide. Let us, in the first instance, follow 

 him from the entrance of Dunloe Gap on the north and as- 

 cend to the summit of the Reeks on the south ; and in the 

 second, consider the view taken by him of a proposed section 

 drawn across Dingle peninsula from Brandon bay on the 

 north, to Feilaturrive on the south ; in both cases employing 

 his own language, more or less condensed, yet placing the 

 series under numbers for the sake of greater distinctness. 



From Dunloe Gap upward, the succession is thus given |: 



1. Reddish-grey quartzose rock; coarse-grained reddish- 

 grey conglomerate ; coarse-grained brownish-red slate (quar- 

 ried for roofing slate); red quartzose sandstone alternating 

 with coarse slate, the sandstone presenting occasionally a con- 

 glomeritic character §. 



2. Chloritic quartz-rock, alternating occasionally with thin 

 beds of green and purple clayslate ; grey quartzose beds, alter- 

 nating with thin beds of purplish clayslate. 



3. Reddish-grey quartzose beds, alternating with thin beds 

 of purplish clayslate. 



4. Higher up, in ascending to the summits of the Coumeen 

 Peest or eastern ridge of the Reeks, the strata become more 

 red, and pass into a brick or cherry-red quartz-rock with 

 some beds of conglomerate, identical in colour, composition, 

 and structure with the red sandstone situated to the north of 



* Lond. and Edinb. Phil. Mag. for March 1840, p. 163. 



t Ibid., p. 166. : Ibid. pp. 163 to 165. 



§ Compare this with the description which I have given of the entrance 

 to Dunloe Gap, in ni}' Memoir on the South of Ireland, in ^ 10, in which 

 I have shown that these strata vary in their dip between the vertical and 

 the horizontal, subject to undulations from north to south, yet with a 

 general dip to the south. It is here Mr. Griffith introduces his supposed 

 fault, but which, as before stated, I conceive to be merely an apparent de- 

 ^dation in the line of strike proceeding from an interrupted curvature of 

 the strata. 



