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LX.—ON SOME POINTS IN THE PHYSICAL GEOLOGY OF 
THE DINGLE AND IVEKRAGH PROMONTORIES, sy A. B. 
WYNNE, F.G.s., F.R.G.S.1., We. 
[Read March 15th, 1880.] 
So many opinions have been expressed and so many conclusions 
arrived at regarding the complex geological relations of this part 
of Ireland, that there is perhaps hardly a useful consideration 
left to urge which has not already been debated if not already 
published. 
Amongst these the apparently simple and natural interpretation 
recently advanced by Professor Hull (Q. Jour. Geo. Soc. Lon., Vol. 
XXXV., p. 669), that the Lower Carboniferous rocks of Iveragh 
were discordantly deposited upon the Dingle-Glengariff beds, can 
scarcely be supposed to have previously eluded the attention of 
the Geological Survey of Ireland, or Professor Jukes’ masterly 
application of the logic of facts. 
If the ably advanced argument of Professor Hull be considered 
less than imperatively conclusive, the following questions will 
probably need further elucidation :— 
1st. Are the Carboniferous beds of Iveragh actually unconform- 
able to the Dingle-Glengariff beds beneath them ? 
2nd. Isit possible that these Lower Carboniferous beds, in- 
cluding the Old Red Sandstone, may be quite discordant in 
Dingle and quite conformable in Iveragh, to the same under- 
lying group of the Dingle-Glengariff beds, within an area of, 
say 5,000 square miles. 
3rd. Is this absolute unconformity necessary to the view that 
the Dingle-Glengariff series is of Silurian age. 
4th. Can the absence of the Dingle type of Old Red Carboni- 
ferous in Iveragh be accounted for by a limit of deposition coin- 
ciding with the Dingle Bay and Killarney Railway fault ? 
5th. Can the fossiliferous Silurian pebbles of the Dingle-Park- 
more conglomerate be contemporaneous with the conglomerate in 
which they are enclosed as derivative masses ? 
1. The first and last of these questions are affirmatively sup- 
ported by Professor Hull, and have doubtless received extensive 
reconsideration by himself, Mr. O’Kelly, and Mr. M‘ Henry, of the 
