On the Old Red Sandstone of Ireland. 139 
book I only hint at the age of the equivalents of the Dingle Beds, 
because at the time it was being written, more than a year ago, 
I was aware that: some of my colleagues were engaged working 
out the disputed rocks in the Curlew and Fintona Mountains, and 
I supposed they would have given attention to the controversy 
concerning theirage. It was not until the book was in print 
that I learned that that dispute had been ignored; although Mr. 
Berdoe-Wilkinson’s work proved that Jukes’ and Foot’s sur- 
mises in respect to the classification of the rocks of the Curlew 
Mountains were correct. Then when I felt at liberty to express 
my opinion, it was too late to do so, except in the preface of the 
book. 
Hitherto I have only given a short sketch of the contro- 
versy respecting the rocks in the various districts mentioned. 
I shall now give a recapitulation of the results which are re- 
presented diagrammatically in Plate 6. 
Section IL—In West Cork, and Kerry south of Dingle Bay the 
“Old Red Sandstone” (Carboniferous) rests conformably on the 
“ Glengariff Grits,’ which, as already mentioned, were considered 
by Griffithand Jukes to be the equivalents of the “ Dingle Beds,” 
(the opinion of such geologists on such a point is scarcely to be 
questioned) and by Griffith to be Silurians. The conformability 
and continuity in this section are quite exceptional and very. re- 
markable. Hither there has been an interesting difference in the 
geological histories of this district and of the neighbouring 
Dingle Promontory, the relations between the respective phe- 
nomena being partially caused by an intervening line of weak- 
ness afterwards marked by the great post-Carboniferous fault 
that extends along the south side of Dingle Bay and the valleys 
of the Flesk and Blackwater, and partially concealed by that 
fault ; or the continuity may possibly (though not probably) be 
only apparent. 
Section I].—This shows the relations of the strata in the 
Dingle Promontory and its neighbourhood, The wide unconfor- 
mity between the “ Dingle Beds” and the “ Old Red Sandstone ” 
(Carboniferous) is indicated at U; a similar break is shown in 
the corresponding place in all the following sections. 
Section IT].—At Toormakeady, Co. Mayo, are conglomerates 
that probably represent the lower portion of the Dingle Beds ; 
ScrEn. Proc. R.D.S., Vou. 11., Pa. 11. in 
4 io! 
