1575 J 
XLVIII. 
SOME RESULTS OF GLACIAL DRAINAGE ROUND MONT- 
PHLIER HILL, CO. DUBLIN. By W. B. WRIGHT, B.A. 
(Prares XXVIII. anp XXIX.) 
[ COMMUNICATED BY PROFESSOR J. JOLY, F.R.S., HON. SHC. R.D.S. | 
‘ [Read June 18 ; Received for Publication Jun 20 ; Published SzpremBeEr 20, 1902. ] 
In many places on the northern slopes of the Dublin Mountains 
there occur curious deep valleys, which cut across the spurs of the 
hills, and which cannot be accounted for with the present topo- 
graphy. Their general character, moreover, is such as to suggest 
that they have been cut by running water at a period geologically 
not very remote ; and it is hence necessary to imagine some agency 
not only capable of modifying the ground sufficiently to cause 
such a flow of water, but also capable of being removed in the 
comparatively short time since elapsed. A very typical example, 
and one with many interesting associated phenomena, happened 
to come within the area allotted to me to survey during last 
summer, and I was hence enabled to examine it in detail. 
While seeking an explanation of these phenomena, my atten- 
tion was called to various papers in which similar gaps recently 
observed in other portions of the British Isles and in America 
were described, and the explanation adopted in these cases seemed 
to apply equally well in that which I am about to describe.’ 
In all these cases the gullies were explained either by the 
action of water ponded back against the hills by the ice-sheet, and 
1 Hermann Leroy Fairchild: ‘‘ Glacial Lakes of Western New York.’’ Bulletin 
Geol. Soc. America, vol. vi., pp. 353-74. 
G. W. Lamplugh: ‘Annual Report of the Geological Survey and Museum of 
Practical Geology for the Year ending December 31, 1895. Appendix to the 43rd 
Report of the Department of Science and Art, p. 18. Brit. Assoc. for the Advance- 
ment of Science. The Isle of Man. An Appendix to the Handbook of 1896. 
Part ii., Geology, p. 179. 
Percy F. Kendall: ‘‘ On the Glacial Drainage of Yorkshire.’’ Rep. Brit. Assoc., 
1899, Dover. 
Thomas L. Watson: ‘‘ Some High Levels in the Post-Glacial Development of the 
SCIEN. PROC. R.D.S., VOL. IX., PART. V. YG 
