288 Mr. Weaver on the Structure of the South of Ireland, 
observed that the Monavoullagh conglomerate range ap- 
proaches so far towards the vale of Dungarvan, that the 
schistose and conglomerated rocks lying south of the Mona- 
voLillagh range, and north of the carboniferous limestone of 
the valley, do not reach to the surface to any great extent ; 
but Mr. Griffith brings into his section as south of the Mona- 
voullagh the older stratified rocks which lie west of the latter, 
namely, such as we traverse north of Lismore when proceed- 
ing from the Blackwater toward the Knockmildown chain, 
and which in fact are merely the western continuation of the 
older stratified rocks that are exposed on the eastward of the 
Monavoullagh range. In the series of strata north of Lis- 
more, and which he designates as the newer transition slate 
series*, there occur, he observes, in some localities, abundant 
marine exuviae, and even vegetable remains, e. g. calamites ; 
and he adds that it is possible the whole may belong to the 
Silurian systemf ; and yet this series is represented as in di- 
rect association with the unquestioned carboniferous limestone 
of the Blackwater valley, which is quite contrary to my ob- 
servationsf. The appearance of vegetable remains here is 
interesting, as bearing analogy to a similar occurrence in the 
transition series at Dunmore in the county of Kerry, observed 
by the late Mr. A. Nimmo, and as elsewhere remarked since 
by Mr. Griffith, which will be noticed in the sequel. 
The ridge intervening between the limestone of the vale 
of the Blackwater and of Dungarvan, and that of the river 
Bride, is said to partake of a similar composition to that 
of the northern side of the Blackwater near Lismore, namely, 
that of green clayslate, yellow sandstone, and coarse red 
slate, forming in the centre of the ridge an anticlinal axis, 
the sandstone containing calamites §. The anticlinal axis I 
have not seen, the dip which I observed being throughout to 
the south ; while in the composition of the ridge I found 
moreover numerous varieties of greywacke, slate, quartz-rock, 
and sandstone, frequently of a reddish-brown hue, also of a 
yellowish and whitish cast, and many coarse conglomerates, 
containing fragments and pebbles of considerable size]]. 
Having arrived at the valley of the Bride, it is time to 
advert more directly to the narrow stripe of brownish-yellow, 
* But which in the new map is now called “old red sandstone.” 
f “Outline,” p.7,note, and Eighth Report of the British Association, p. 82. 
J Both in the valley of the Blackwater and that of the Suire, Mr. Grif- 
fith appears to me to have confounded together the slate clay of the car- 
boniferous limestone with the clayslate of the transition series. 
§ Eighth Report of the British Association, pp. 82, 83. 
II Memoir on the South of Ireland, Geol. Trans., vol. v., second series, 
§ 20 . 
