476 Mr. Weaver on the Structure of the South of Ireland^ 
Silurian fossils. The immediate substrata of the Dunloe red 
conglomerate, sandstone, and red slate are not visible, being 
unconformahly overlaid on the north by the carboniferous 
limestone in the western quarter, and by the coal formation 
in the eastern ; while, on the other hand, the transition series 
of the Dingle peninsula, just described, are unconformahly 
overlaid on the east by the old red sandstone of the Slieve 
Meesh range (Cahirconree of Mr. Griffith); the difference in 
the seras of production between the transition series and the 
carboniferous series being thus in both cases clearly marked^'. 
To the south of the strata of which we have been speaking, 
there is a band of blackish-grey clayslate, which may deserve 
Mr. Griffith’s attention. It is traversed by the new line of 
road from Killarney to Kenmare, as it passes up by the line 
of the Upper Lake, and if duly examined might perhaps be 
found productive of fossils. This instance may suffice to 
show that there is no want of repetition of similar beds in 
a line traversing the series from north to south. In the 
general succession occur also well-defined greywacke and 
greywacke slate, terms which being out of favour with some 
geologists, Mr. Griffith appears to avoid using, although 
highly distinctive and useful when employed in a legitimate 
sense. 
Upon the whole, I see no reason to depart from the opinion 
which I have formerly given, namely, that the limestone of 
the region of Muckruss extending to Killarney, is a local 
deposit enveloped and intercalated in the general transition 
series. And the same view, as to their forming portions of 
the consecutive series, applies to the other limestone bands 
in the south of Ireland, whether inclosed in and interstrati- 
fied with the adjacent rocks, or merely superimposed and 
interstratified in the form of a trough with the subjacent 
series. In the valley of Kenmare this latter position appears 
to be established by the detailed researches of Mr. Griffith, 
which, I confess, escaped my observation. 
That among the strata in immediate association with the 
bands of limestone in the south of Ireland, some should be 
found, whether bearing the character of sandstone or clay- 
slate, containing certain vegetable remains, cannot be held 
sufficient to invalidate the general view which I have taken ; 
1st, because such remains are not wholly foreign to a transi- 
tion country ; and 2nd, because it has been shown that the 
older stratified rocks of the south of Ireland form one con- 
secutive series. 
* See my Geological Map of the South of Ireland in Geol. Trans., vol. v., 
second series. 
