Correspondence. 89 



I refer to the old shape of the ground and not to the angles of the 

 overlying deposits. At foot of page 10, for " Benluben " read Ben- 

 bulben. — While writing I may mention, in connection with the subject 

 of faults in drift, a suggestion, made with reference to those illus- 

 trated in Plate II. Fig. 8 of the above number and others, in Expla- 

 nation Sh. 126, Mem. Geol. Survey, Ireland, to the effect that they 

 might have been caused in tenaceous drift by the intersection of 

 planes of separation inclined towards each other so as to meet along 

 a line also inclined to the horizon : and enclosing wedge-shaped 

 masses of the material which from passage of water or from being 

 deprived of support at their larger ends by natural causes would 

 slide into lower positions; subsequent denudation settlement, etc., 

 exposing faulted sections and perhaps obliterating other marks of 

 subsidence. 



None of these drift faults or dislocations were found to penetrate 

 the underlying (limestone) rock, but I have heard of one from my 

 friend, Mr. Kinahan, which is said to fault both the Coal-measures and 

 superficial deposits in the Castle Corner Field. — Wishing your Maga- 

 2!ine the compliments of the season, I am truly yours, 



A. B. Wynne. 



London, January Isf, 1867. 



DENUDATION AND THE FORM OF THE GROUND. 

 To the Editor of the Geological Magazine. 



Sm, — My old colleague, Mr. A. B. Wynne, appears to have quite 

 forgotten the S.W. of Cork and Kerry, when he says in the 

 Geological Magazine, for January, 1867, p. 6, "Isolated rocky 

 pillars upon hills, the very aspects of which suggest that the stone is 

 being gradually disintegrated by rains." Does he forget the 

 Skelluigs off the coast of Kerry ; the Fasnet Kock (See Woodcut) 



Fasnet Rock and Light-house, coast of Cork, with soundings of 40 fathoms, 6 fathoms 



from the rock 



